From seminars-announce.astro-at-su.se at lists.su.se Mon Jan 11 12:11:02 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 11 Jan 2021 11:11:02 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 15 January 10:30: Matthias Samland Message-ID: Dear all, Happy New Year! On Friday January 15 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Matthias Samland from the Stockholm University. Title: Astronomy's above average contribution to global heating. An astronomical institute's CO2 footprint. Abstract: With weather and climate extremes increasing both in frequency and intensity each year, it is becoming increasingly apparent to the population at large that prediction’s from climate scientists are not depicting a far future, but are already under way and accelerating. The Paris Climate Agreement to limit global heating to under 1.5°C (an acceptable level of “doom”: e.g., at least only ~95% of corrals reefs will die and not all of them) was decided 5 years ago. This goal requires for society to quickly transition away from producing greenhouse gas emissions in all areas of life, including, of course, research. I’ve been involved in the the Max Planck Institute for Astronomy’s (MPIA) Sustainability Group over the last years before coming to Stockholm and we have looked in detail at the carbon footprint of astronomy, viewed at the level of one astronomical institute. Understanding the distribution of CO2 impacts of different activities commonly undertaken by researchers (flying, computing, infrastructure, telescope operation) has to be the evidence basis for actually achieving carbon neutrality in time to prevent catastrophic levels of warming in the climate system. Climate change in turn has a catastrophic impact on astronomy itself as evidences by, for example, increasigly worse conditions at previously optimal observation sites. This assessment has to be repeated yearly and combined with an actual path of emission reductions and a concrete plan to achieve said goals. Knowing the CO2 footprint of an institute is only the first step towards this goal, but incredibly important. In this talk I will walk you through the example of what we are, and have been, doing at MPIA, but many of the same conclusions will be applicable to institute’s world-wide. These activities have been put into motion by students and staff and are proof that involvement in this topic can lead to real change. As such this talk is intended to spark a discussion and also be a discussion. https://www.albanova.se/event/matthias_samland/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 22/01: Steve Schulze (SU) 29/01: no speaker yet 05/02: Natasha Jeffrey (Northumbria University, UK) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Matthias Samland Time: Jan 15, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/61530312071 Meeting ID: 615 3031 2071 One tap mobile +46850163827,,61530312071# Sweden +46850500828,,61530312071# Sweden Dial by your location +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden +46 8 4468 2488 Sweden Meeting ID: 615 3031 2071 Find your local number: https://stockholmuniversity.zoom.us/u/ceI7N7AlIX Join by SIP 61530312071 at 109.105.112.236 61530312071 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 615 3031 2071 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/61530312071 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Thu Jan 14 15:39:39 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Thu, 14 Jan 2021 14:39:39 +0000 Subject: [Astronomy seminar] [alla@astro.su.se] Astronomy seminar via zoom, 15 January 10:30: Matthias Samland In-Reply-To: <8A54F325-136C-4939-AF7D-8D73724C1C15@astro.su.se> References: <8A54F325-136C-4939-AF7D-8D73724C1C15@astro.su.se> Message-ID: Dear All, Here is a reminder for tomorrow’s seminar by Matthias. We got several requests to record tomorrow’s seminar talk, some people won’t be able to attend but they are interested in this topic. So we will try to record the talk, but not the Q&A part. The recorded video won’t be released public, and only shared with individual who expressed an interest in the topic but couldn't join to listen to the talk directly. You could set your name anonymous when join the Zoom if you like. :) Best wishes, Matthias & Janet On 11 Jan 2021, at 12:11, Janet Ting-Wan Chen > wrote: Dear all, Happy New Year! On Friday January 15 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Matthias Samland from the Stockholm University. Title: Astronomy's above average contribution to global heating. An astronomical institute's CO2 footprint. Abstract: With weather and climate extremes increasing both in frequency and intensity each year, it is becoming increasingly apparent to the population at large that prediction’s from climate scientists are not depicting a far future, but are already under way and accelerating. The Paris Climate Agreement to limit global heating to under 1.5°C (an acceptable level of “doom”: e.g., at least only ~95% of corrals reefs will die and not all of them) was decided 5 years ago. This goal requires for society to quickly transition away from producing greenhouse gas emissions in all areas of life, including, of course, research. I’ve been involved in the the Max Planck Institute for Astronomy’s (MPIA) Sustainability Group over the last years before coming to Stockholm and we have looked in detail at the carbon footprint of astronomy, viewed at the level of one astronomical institute. Understanding the distribution of CO2 impacts of different activities commonly undertaken by researchers (flying, computing, infrastructure, telescope operation) has to be the evidence basis for actually achieving carbon neutrality in time to prevent catastrophic levels of warming in the climate system. Climate change in turn has a catastrophic impact on astronomy itself as evidences by, for example, increasigly worse conditions at previously optimal observation sites. This assessment has to be repeated yearly and combined with an actual path of emission reductions and a concrete plan to achieve said goals. Knowing the CO2 footprint of an institute is only the first step towards this goal, but incredibly important. In this talk I will walk you through the example of what we are, and have been, doing at MPIA, but many of the same conclusions will be applicable to institute’s world-wide. These activities have been put into motion by students and staff and are proof that involvement in this topic can lead to real change. As such this talk is intended to spark a discussion and also be a discussion. https://www.albanova.se/event/matthias_samland/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 22/01: Steve Schulze (SU) 29/01: no speaker yet 05/02: Natasha Jeffrey (Northumbria University, UK) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Matthias Samland Time: Jan 15, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/61530312071 Meeting ID: 615 3031 2071 One tap mobile +46850163827,,61530312071# Sweden +46850500828,,61530312071# Sweden Dial by your location +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden +46 8 4468 2488 Sweden Meeting ID: 615 3031 2071 Find your local number: https://stockholmuniversity.zoom.us/u/ceI7N7AlIX Join by SIP 61530312071 at 109.105.112.236 61530312071 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 615 3031 2071 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/61530312071 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Jan 15 10:11:11 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 15 Jan 2021 09:11:11 +0000 Subject: [Astronomy seminar] [alla@astro.su.se] Astronomy seminar via zoom, "Today" 10:30: Matthias Samland In-Reply-To: <30A6B20C-C231-4FF7-8F7F-C92B1C17F512@astro.su.se> References: <8A54F325-136C-4939-AF7D-8D73724C1C15@astro.su.se> <30A6B20C-C231-4FF7-8F7F-C92B1C17F512@astro.su.se> Message-ID: Dear All, A reminder of today’s Astronomy seminar by Matthias soon! Join Zoom Meeting https://stockholmuniversity.zoom.us/j/61530312071 Best wishes, Janet & Matthias On 14 Jan 2021, at 15:39, Janet Ting-Wan Chen > wrote: Dear All, Here is a reminder for tomorrow’s seminar by Matthias. We got several requests to record tomorrow’s seminar talk, some people won’t be able to attend but they are interested in this topic. So we will try to record the talk, but not the Q&A part. The recorded video won’t be released public, and only shared with individual who expressed an interest in the topic but couldn't join to listen to the talk directly. You could set your name anonymous when join the Zoom if you like. :) Best wishes, Matthias & Janet On 11 Jan 2021, at 12:11, Janet Ting-Wan Chen > wrote: Dear all, Happy New Year! On Friday January 15 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Matthias Samland from the Stockholm University. Title: Astronomy's above average contribution to global heating. An astronomical institute's CO2 footprint. Abstract: With weather and climate extremes increasing both in frequency and intensity each year, it is becoming increasingly apparent to the population at large that prediction’s from climate scientists are not depicting a far future, but are already under way and accelerating. The Paris Climate Agreement to limit global heating to under 1.5°C (an acceptable level of “doom”: e.g., at least only ~95% of corrals reefs will die and not all of them) was decided 5 years ago. This goal requires for society to quickly transition away from producing greenhouse gas emissions in all areas of life, including, of course, research. I’ve been involved in the the Max Planck Institute for Astronomy’s (MPIA) Sustainability Group over the last years before coming to Stockholm and we have looked in detail at the carbon footprint of astronomy, viewed at the level of one astronomical institute. Understanding the distribution of CO2 impacts of different activities commonly undertaken by researchers (flying, computing, infrastructure, telescope operation) has to be the evidence basis for actually achieving carbon neutrality in time to prevent catastrophic levels of warming in the climate system. Climate change in turn has a catastrophic impact on astronomy itself as evidences by, for example, increasigly worse conditions at previously optimal observation sites. This assessment has to be repeated yearly and combined with an actual path of emission reductions and a concrete plan to achieve said goals. Knowing the CO2 footprint of an institute is only the first step towards this goal, but incredibly important. In this talk I will walk you through the example of what we are, and have been, doing at MPIA, but many of the same conclusions will be applicable to institute’s world-wide. These activities have been put into motion by students and staff and are proof that involvement in this topic can lead to real change. As such this talk is intended to spark a discussion and also be a discussion. https://www.albanova.se/event/matthias_samland/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 22/01: Steve Schulze (SU) 29/01: no speaker yet 05/02: Natasha Jeffrey (Northumbria University, UK) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Matthias Samland Time: Jan 15, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/61530312071 Meeting ID: 615 3031 2071 One tap mobile +46850163827,,61530312071# Sweden +46850500828,,61530312071# Sweden Dial by your location +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden +46 8 4468 2488 Sweden Meeting ID: 615 3031 2071 Find your local number: https://stockholmuniversity.zoom.us/u/ceI7N7AlIX Join by SIP 61530312071 at 109.105.112.236 61530312071 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 615 3031 2071 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/61530312071 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Jan 18 12:47:30 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 18 Jan 2021 11:47:30 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 22 January 10:30: Steve Schulze Message-ID: Dear all, On Friday January 22 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Steve Schulze from the Stockholm University. Title: The Host Galaxies of the PTF Core-Collapse Supernova Sample Abstract: The paradigm shift from galaxy-selected to quasi-synoptic surveys led to a revolution in the study of optical transients. The Palomar Transient Factory (PTF) has played an important role in this revolution. PTF was a fully-automated, wide-field survey using the 1.2-m Samuel Oschin telescope (P48) at Palomar Observatory (USA). Between 2009 and 2017, PTF discovered almost 900 core-collapse supernovae. Here, I present the host galaxy properties of the core-collapse supernova sample. I obtained photometry from the rest-frame UV to the NIR for each host and modelled the spectral energy distributions to extract the mass and star-formation rate of each host. I will contrast each sub-class’s ensemble properties with expectations from field-galaxy samples to deduce whether different classes of core-collapse supernovae show a preference for particular galactic environments. Furthermore, I will show how we can use SNe as beacons to study extreme star-formation environments and how we can use them to select rare phases in galaxy evolution. https://www.albanova.se/event/steve_schulze/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 29/01: no speaker yet 05/02: Natasha Jeffrey (Northumbria University, UK) 12/02: Claudia Gutierrez (FINCA, Finland) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Steve Schulze Time: Jan 22, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/67630857507 Meeting ID: 676 3085 7507 One tap mobile +46850500829,,67630857507# Sweden +46850520017,,67630857507# Sweden Dial by your location +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden Meeting ID: 676 3085 7507 Find your local number: https://stockholmuniversity.zoom.us/u/cdOrWngyjA Join by SIP 67630857507 at 109.105.112.236 67630857507 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 676 3085 7507 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/67630857507 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Jan 22 10:01:07 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 22 Jan 2021 09:01:07 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, "Today" 10:30: Steve Schulze In-Reply-To: <47672FEE-65ED-4EA2-86A8-EF6780A6C978@astro.su.se> References: <47672FEE-65ED-4EA2-86A8-EF6780A6C978@astro.su.se> Message-ID: Dear All, Here is a reminder for our seminar in 30 mins! Join Zoom Meeting https://stockholmuniversity.zoom.us/j/67630857507 Cheers, Janet & Matthias On 18 Jan 2021, at 12:47, Janet Ting-Wan Chen > wrote: Dear all, On Friday January 22 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Steve Schulze from the Stockholm University. Title: The Host Galaxies of the PTF Core-Collapse Supernova Sample Abstract: The paradigm shift from galaxy-selected to quasi-synoptic surveys led to a revolution in the study of optical transients. The Palomar Transient Factory (PTF) has played an important role in this revolution. PTF was a fully-automated, wide-field survey using the 1.2-m Samuel Oschin telescope (P48) at Palomar Observatory (USA). Between 2009 and 2017, PTF discovered almost 900 core-collapse supernovae. Here, I present the host galaxy properties of the core-collapse supernova sample. I obtained photometry from the rest-frame UV to the NIR for each host and modelled the spectral energy distributions to extract the mass and star-formation rate of each host. I will contrast each sub-class’s ensemble properties with expectations from field-galaxy samples to deduce whether different classes of core-collapse supernovae show a preference for particular galactic environments. Furthermore, I will show how we can use SNe as beacons to study extreme star-formation environments and how we can use them to select rare phases in galaxy evolution. https://www.albanova.se/event/steve_schulze/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 29/01: no speaker yet 05/02: Natasha Jeffrey (Northumbria University, UK) 12/02: Claudia Gutierrez (FINCA, Finland) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Steve Schulze Time: Jan 22, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/67630857507 Meeting ID: 676 3085 7507 One tap mobile +46850500829,,67630857507# Sweden +46850520017,,67630857507# Sweden Dial by your location +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden Meeting ID: 676 3085 7507 Find your local number: https://stockholmuniversity.zoom.us/u/cdOrWngyjA Join by SIP 67630857507 at 109.105.112.236 67630857507 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 676 3085 7507 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/67630857507 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Jan 25 11:08:53 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 25 Jan 2021 10:08:53 +0000 Subject: [Astronomy seminar] No astronomy seminar this Friday Message-ID: Dear all, There is no astronomy seminar this Friday. Best regards, Matthias & Janet Upcoming events: 05/02: Natasha Jeffrey (Northumbria University, UK) 12/02: Claudia Gutierrez (FINCA, Finland) -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Feb 1 12:38:47 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 1 Feb 2021 11:38:47 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 05 February 10:30: Natasha Jeffrey Message-ID: Dear all, On Friday February 05 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Natasha Jeffrey from Northumbria University. Title: Solar flares: our laboratory for understanding particle acceleration and transport processes Abstract: Solar flares are efficient particle accelerators and prime laboratories for studying astrophysical acceleration processes, with a high fraction of the released magnetic energy being carried by energetic particles. Over the last decade, our understanding of particle acceleration and transport in flares has been enhanced by new models and available multi-wavelength observations from X-rays to (E)UV to radio. However, many questions remain about how and where energetic particles are accelerated, and how different plasma environments (e.g., collisions, turbulence) affect the transport and observed properties of energetic particles. In this talk, I will review some of these advances and also discuss upcoming X-ray stereoscopic observations with Solar Orbiter/STIX and new X-ray missions at Earth. https://www.albanova.se/event/natasha_jeffrey/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 12/02: Claudia Gutierrez (FINCA, Finland) 19/02: Iryna Kushniruk (Stockholm University, Sweden) 26/02: Sheng Yang (Stockholm University, Sweden) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/66615940462 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Feb 5 09:05:43 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 5 Feb 2021 08:05:43 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 05 February 10:30: Natasha Jeffrey In-Reply-To: References: Message-ID: Reminder: Talk by Natasha Jeffrey in 90 minutes / today at 10:30 am ________________________________ From: Matthias Samland Sent: Monday, February 1, 2021 12:38 PM Subject: Astronomy seminar via zoom, 05 February 10:30: Natasha Jeffrey Dear all, On Friday February 05 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Natasha Jeffrey from Northumbria University. Title: Solar flares: our laboratory for understanding particle acceleration and transport processes Abstract: Solar flares are efficient particle accelerators and prime laboratories for studying astrophysical acceleration processes, with a high fraction of the released magnetic energy being carried by energetic particles. Over the last decade, our understanding of particle acceleration and transport in flares has been enhanced by new models and available multi-wavelength observations from X-rays to (E)UV to radio. However, many questions remain about how and where energetic particles are accelerated, and how different plasma environments (e.g., collisions, turbulence) affect the transport and observed properties of energetic particles. In this talk, I will review some of these advances and also discuss upcoming X-ray stereoscopic observations with Solar Orbiter/STIX and new X-ray missions at Earth. https://www.albanova.se/event/natasha_jeffrey/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 12/02: Claudia Gutierrez (FINCA, Finland) 19/02: Iryna Kushniruk (Stockholm University, Sweden) 26/02: Sheng Yang (Stockholm University, Sweden) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/66615940462 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Feb 8 11:08:52 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 8 Feb 2021 10:08:52 +0000 Subject: [Astronomy seminar] =?utf-8?q?Astronomy_seminar_via_zoom=2C_12_Fe?= =?utf-8?q?bruary_10=3A30=3A_Claudia_P=2E_Guti=C3=A9rrez?= In-Reply-To: <47672FEE-65ED-4EA2-86A8-EF6780A6C978@astro.su.se> References: <47672FEE-65ED-4EA2-86A8-EF6780A6C978@astro.su.se> Message-ID: Dear all, On Friday February 12 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Claudia P. Gutiérrez from the Finnish Centre for Astronomy with ESO (FINCA), Finland. Title: Hydrogen-rich supernovae: their explosion and progenitor properties. Abstract: Hydrogen-rich supernovae (type II Supernovae; SNe II) are produced by the final explosions of massive stars (>8-10 Msun ), which retain a significant part of their hydrogen envelopes before the explosion. These SNe show a large diversity in their transient behaviour, which is likely determined by differences, not just in explosion properties, but also in the progenitor star characteristics. In this talk, I will present the current status of SNe II studies. I will focus on new results found with a sample of SNe II occurring within low-luminosity galaxies. I will also describe the challenges in the determination of the explosion and progenitor parameters for these objects. https://www.albanova.se/event/claudia_gutierrez/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 19/02: Iryna Kushniruk (Stockholm University) 26/02: Sheng Yang (Stockholm University) 05/03: SPORT LOV =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Claudia Gutierrez Time: Feb 12, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/69394882509 Meeting ID: 693 9488 2509 One tap mobile +46850500829,,69394882509# Sweden +46850520017,,69394882509# Sweden Dial by your location +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden Meeting ID: 693 9488 2509 Find your local number: https://stockholmuniversity.zoom.us/u/c3XRfEc4z Join by SIP 69394882509 at 109.105.112.236 69394882509 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 693 9488 2509 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/69394882509 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Feb 12 09:39:32 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 12 Feb 2021 08:39:32 +0000 Subject: [Astronomy seminar] =?utf-8?b?W2FsbGFAYXN0cm8uc3Uuc2VdIEFzdHJv?= =?utf-8?q?nomy_seminar_via_zoom=2C_=22Today=22_10=3A30=3A_Claudia_P=2E_Gu?= =?utf-8?q?ti=C3=A9rrez?= In-Reply-To: <0777393D-E8BE-41CF-B4C9-DB3E74FF5B86@astro.su.se> References: <47672FEE-65ED-4EA2-86A8-EF6780A6C978@astro.su.se> <0777393D-E8BE-41CF-B4C9-DB3E74FF5B86@astro.su.se> Message-ID: Hi All, Here is a reminder for our seminar today! Join Zoom Meeting https://stockholmuniversity.zoom.us/j/69394882509 Cheers, Janet & Matthias On 8 Feb 2021, at 11:08, Janet Ting-Wan Chen > wrote: Dear all, On Friday February 12 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Claudia P. Gutiérrez from the Finnish Centre for Astronomy with ESO (FINCA), Finland. Title: Hydrogen-rich supernovae: their explosion and progenitor properties. Abstract: Hydrogen-rich supernovae (type II Supernovae; SNe II) are produced by the final explosions of massive stars (>8-10 Msun ), which retain a significant part of their hydrogen envelopes before the explosion. These SNe show a large diversity in their transient behaviour, which is likely determined by differences, not just in explosion properties, but also in the progenitor star characteristics. In this talk, I will present the current status of SNe II studies. I will focus on new results found with a sample of SNe II occurring within low-luminosity galaxies. I will also describe the challenges in the determination of the explosion and progenitor parameters for these objects. https://www.albanova.se/event/claudia_gutierrez/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 19/02: Iryna Kushniruk (Stockholm University) 26/02: Sheng Yang (Stockholm University) 05/03: SPORT LOV =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Claudia Gutierrez Time: Feb 12, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/69394882509 Meeting ID: 693 9488 2509 One tap mobile +46850500829,,69394882509# Sweden +46850520017,,69394882509# Sweden Dial by your location +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden Meeting ID: 693 9488 2509 Find your local number: https://stockholmuniversity.zoom.us/u/c3XRfEc4z Join by SIP 69394882509 at 109.105.112.236 69394882509 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 693 9488 2509 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/69394882509 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Feb 15 12:10:06 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 15 Feb 2021 11:10:06 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 19 February 10:30: Iryna Kushniruk Message-ID: Dear all, On Friday February 19 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Iryna Kushniruk from Stockholm University. Title: The nature of kinematic structures in the Galactic disk and halo Abstract: The Milky Way contains a complex plethora of kinematic structures, that is groups of stars that share a common motion. Although the origin of many kinematic groups are unknown and some widely debated, many of the known kinematic structures can be explained with one or several of the following hypotheses: dissolving star clusters; dynamical resonances between stars and the Galactic bar and/or spiral arms; extragalactic origin via merger events; or phase mixing due to galactic accretion events. Therefore, one of the approaches to try to understand the detailed structure of the Milky Way has been to search for and characterize such kinematic structures. In this talk I will review main reasons why some stars form kinematic structures, I will show how to characterize some selected kinematic structures in the Milky Way’s disk and halo using large-scale astrometric and spectroscopic surveys, and I will explain how this information can be used to better understand Galaxy formation and evolution. https://www.albanova.se/event/iryna_kushniruk/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 26/02: Sheng Yang (Stockholm University, Sweden) 12/03: Davide Gizzi (Stockholm University, Sweden) 26/03: Sylvia Plöckinger (Leiden University, The Netherlands) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/64091714590 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Feb 19 09:08:10 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 19 Feb 2021 08:08:10 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 19 February 10:30: Iryna Kushniruk In-Reply-To: <5d7eac34902643b08bf52cae695a573f@astro.su.se> References: <5d7eac34902643b08bf52cae695a573f@astro.su.se> Message-ID: Reminder: Talk by Iryna Kushniruk in 90 minutes / today at 10:30 am ________________________________ From: Matthias Samland Sent: Monday, February 15, 2021 12:10 PM Subject: Astronomy seminar via zoom, 19 February 10:30: Iryna Kushniruk Dear all, On Friday February 19 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Iryna Kushniruk from Stockholm University. Title: The nature of kinematic structures in the Galactic disk and halo Abstract: The Milky Way contains a complex plethora of kinematic structures, that is groups of stars that share a common motion. Although the origin of many kinematic groups are unknown and some widely debated, many of the known kinematic structures can be explained with one or several of the following hypotheses: dissolving star clusters; dynamical resonances between stars and the Galactic bar and/or spiral arms; extragalactic origin via merger events; or phase mixing due to galactic accretion events. Therefore, one of the approaches to try to understand the detailed structure of the Milky Way has been to search for and characterize such kinematic structures. In this talk I will review main reasons why some stars form kinematic structures, I will show how to characterize some selected kinematic structures in the Milky Way’s disk and halo using large-scale astrometric and spectroscopic surveys, and I will explain how this information can be used to better understand Galaxy formation and evolution. https://www.albanova.se/event/iryna_kushniruk/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 26/02: Sheng Yang (Stockholm University, Sweden) 12/03: Davide Gizzi (Stockholm University, Sweden) 26/03: Sylvia Plöckinger (Leiden University, The Netherlands) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/64091714590 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Feb 22 15:07:24 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 22 Feb 2021 14:07:24 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 26 February 10:30: Sheng Yang In-Reply-To: <47672FEE-65ED-4EA2-86A8-EF6780A6C978@astro.su.se> References: <47672FEE-65ED-4EA2-86A8-EF6780A6C978@astro.su.se> Message-ID: Dear all, On Friday February 26 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Sheng Yang from the Stockholm University. Title: Electromagnetic signals from gravitational wave events Abstract: Gravitational-wave (GW) signal were finally detected by LIGO on 14th September 2015. On 17th August 2017, the joint observations of a compact binary coalescence in both GW and electromagnetic (EM) channels mark the beginning of the GW multi-messenger astronomy era. In this talk, I will briefly present the followup searches of possible optical counterparts of GW events. I have developed the observational strategies for trigger search, developed pipelines for image analysis and automatic candidate vetting via machine learning algorithm, as well as contribution to spectroscopic identifications and further inferences. I will show our main contributions (on behalf of GRAWITA and DLT40 projects which I was part of) during the first three LIGO-VIRGO collaboration runs. In particular, we had an independent discovery of the kilonova AT 2017gfo, that is, the optical counterpart of GW 170817/GRB 170817A. Finally, as a postdoc at OKC Stockholm now, I will present my current work within the ZTF survey, the GREAT environment, and our plans for search of future GW counterparts. https://www.albanova.se/event/sheng_yang/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 05/03: no seminar ; SPORT LOV 12/03: Davide Gizzi (PhD seminar) 19/03: Sylvia Plöckinger (Leiden) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Sheng Yang Time: Feb 26, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/62777916162 Meeting ID: 627 7791 6162 One tap mobile +46844682488,,62777916162# Sweden +46850163827,,62777916162# Sweden Dial by your location +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden Meeting ID: 627 7791 6162 Find your local number: https://stockholmuniversity.zoom.us/u/cdhXnBbUfk Join by SIP 62777916162 at 109.105.112.236 62777916162 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 627 7791 6162 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/62777916162 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Feb 26 09:05:59 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 26 Feb 2021 08:05:59 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 26 February 10:30: Sheng Yang In-Reply-To: <75B2330E-CA90-426B-AFD9-DA468BAA7F86@astro.su.se> References: <47672FEE-65ED-4EA2-86A8-EF6780A6C978@astro.su.se>, <75B2330E-CA90-426B-AFD9-DA468BAA7F86@astro.su.se> Message-ID: Reminder: Sheng Yang's seminar is at 10:30 (in 90 minutes) https://stockholmuniversity.zoom.us/j/62777916162 ________________________________ From: Alla-at-astro.su.se on behalf of Janet Ting-Wan Chen Sent: Monday, February 22, 2021 3:07 PM Subject: [alla at astro.su.se] Astronomy seminar via zoom, 26 February 10:30: Sheng Yang Dear all, On Friday February 26 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Sheng Yang from the Stockholm University. Title: Electromagnetic signals from gravitational wave events Abstract: Gravitational-wave (GW) signal were finally detected by LIGO on 14th September 2015. On 17th August 2017, the joint observations of a compact binary coalescence in both GW and electromagnetic (EM) channels mark the beginning of the GW multi-messenger astronomy era. In this talk, I will briefly present the followup searches of possible optical counterparts of GW events. I have developed the observational strategies for trigger search, developed pipelines for image analysis and automatic candidate vetting via machine learning algorithm, as well as contribution to spectroscopic identifications and further inferences. I will show our main contributions (on behalf of GRAWITA and DLT40 projects which I was part of) during the first three LIGO-VIRGO collaboration runs. In particular, we had an independent discovery of the kilonova AT 2017gfo, that is, the optical counterpart of GW 170817/GRB 170817A. Finally, as a postdoc at OKC Stockholm now, I will present my current work within the ZTF survey, the GREAT environment, and our plans for search of future GW counterparts. https://www.albanova.se/event/sheng_yang/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 05/03: no seminar ; SPORT LOV 12/03: Davide Gizzi (PhD seminar) 19/03: Sylvia Plöckinger (Leiden) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Sheng Yang Time: Feb 26, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/62777916162 Meeting ID: 627 7791 6162 One tap mobile +46844682488,,62777916162# Sweden +46850163827,,62777916162# Sweden Dial by your location +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden Meeting ID: 627 7791 6162 Find your local number: https://stockholmuniversity.zoom.us/u/cdhXnBbUfk Join by SIP 62777916162 at 109.105.112.236 62777916162 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 627 7791 6162 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/62777916162 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Mar 1 11:10:29 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 1 Mar 2021 10:10:29 +0000 Subject: [Astronomy seminar] No astronomy seminar this Friday In-Reply-To: <026F58B6-F8D8-4735-B10F-CB282EF9402C@astro.su.se> References: <026F58B6-F8D8-4735-B10F-CB282EF9402C@astro.su.se> Message-ID: Dear all, There is no astronomy seminar this Friday due to SPORT LOV (holiday). Best regards, Matthias & Janet Upcoming events: 12/03: Davide Gizzi (PhD seminar) 19/03: Sylvia Plöckinger (Leiden) 26/03: Matthew Kenworthy (Leiden) -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Mar 8 13:23:56 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 8 Mar 2021 12:23:56 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 12 March 10:30: Davide Gizzi Message-ID: Dear all, On Friday March 12 at 10:30, we will have the PhD Seminar, remotely via zoom. Our speaker is Davide Gizzi from the Stockholm University. Title: Neutrino-driven winds in binary neutron star mergers Abstract: Neutrinos are produced in copious amounts in the hot environment of a Binary Neutron Star Merger (BNSM). Although being the main source of cooling, neutrinos get scattered and absorbed while leaking out the post-merger system because of the large matter densities. If matter in the decoupling region gets enough momentum by neutrino absorption to overcome the gravitational well of the central merger remnant, neutrinos are able to power mass ejection called neutrino-driven winds. At the same time, neutrino absorption on nucleons affects the ejecta composition by changing the amount of neutrons. Since the neutron richness in the ejecta sets the strength of the r-process nucleosynthesis and the matter opacity, the macronova signal arising from the decay of the unstable r-process nuclei in the wind carries the signature of weak interactions in mergers as it shines in the optical wavelength band. The detection of the blue macronova following the event GW170817 was a clear observational signature of weak interactions in BNSMs. However, other mass ejection channels beside neutrino-driven winds have been shown to potentially contribute to this optical counterpart of the macronova. In addition, relativistic jets launched from the central engine and drilling through the ejecta have been shown to impact the macronova signal, complicating our understanding of the diversity of macronova light curves. Looking forward to future, new macronova detections, it is therefore important to systematically study neutrino-driven wind contribution to macronova light curves for different total masses, mass ratios of the binary and Equation of States (EoSs), as well as accounting for jet-wind interplays for different jet properties. For this purpose, I am going to talk about the implementation of an inexpensive, efficient approximation to the neutrino transport called Advanced Spectral Leakage (ASL). This scheme can be coupled to Lagrangian hydrodynamics with the Smoothed-Particle Hydrodynamics (SPH) approach to provide neutrino-driven wind profiles from dynamical simulations of BNSMs. In this way, it will be possible to systematically extract the associated macronova light curves and characterize their diversity. https://www.albanova.se/event/davide_gizzi/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 19/03: Sylvia Plöckinger (Leiden) 26/03: Matthew Kenworthy (Leiden) 02/04: Good friday =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Davide Gizzi Time: Mar 12, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/65499466134 Meeting ID: 654 9946 6134 One tap mobile +46844682488,,65499466134# Sweden +46850163827,,65499466134# Sweden Dial by your location +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden Meeting ID: 654 9946 6134 Find your local number: https://stockholmuniversity.zoom.us/u/cbFw9T6StF Join by SIP 65499466134 at 109.105.112.236 65499466134 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 654 9946 6134 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/65499466134 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Mar 12 09:51:48 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 12 Mar 2021 08:51:48 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, Today 10:30: Davide Gizzi In-Reply-To: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> References: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> Message-ID: Hi All, Here is a reminder for our PhD seminar today! Join Zoom Meeting https://stockholmuniversity.zoom.us/j/65499466134 Best wishes, Matthias & Janet On 8 Mar 2021, at 13:23, Janet Ting-Wan Chen > wrote: Dear all, On Friday March 12 at 10:30, we will have the PhD Seminar, remotely via zoom. Our speaker is Davide Gizzi from the Stockholm University. Title: Neutrino-driven winds in binary neutron star mergers Abstract: Neutrinos are produced in copious amounts in the hot environment of a Binary Neutron Star Merger (BNSM). Although being the main source of cooling, neutrinos get scattered and absorbed while leaking out the post-merger system because of the large matter densities. If matter in the decoupling region gets enough momentum by neutrino absorption to overcome the gravitational well of the central merger remnant, neutrinos are able to power mass ejection called neutrino-driven winds. At the same time, neutrino absorption on nucleons affects the ejecta composition by changing the amount of neutrons. Since the neutron richness in the ejecta sets the strength of the r-process nucleosynthesis and the matter opacity, the macronova signal arising from the decay of the unstable r-process nuclei in the wind carries the signature of weak interactions in mergers as it shines in the optical wavelength band. The detection of the blue macronova following the event GW170817 was a clear observational signature of weak interactions in BNSMs. However, other mass ejection channels beside neutrino-driven winds have been shown to potentially contribute to this optical counterpart of the macronova. In addition, relativistic jets launched from the central engine and drilling through the ejecta have been shown to impact the macronova signal, complicating our understanding of the diversity of macronova light curves. Looking forward to future, new macronova detections, it is therefore important to systematically study neutrino-driven wind contribution to macronova light curves for different total masses, mass ratios of the binary and Equation of States (EoSs), as well as accounting for jet-wind interplays for different jet properties. For this purpose, I am going to talk about the implementation of an inexpensive, efficient approximation to the neutrino transport called Advanced Spectral Leakage (ASL). This scheme can be coupled to Lagrangian hydrodynamics with the Smoothed-Particle Hydrodynamics (SPH) approach to provide neutrino-driven wind profiles from dynamical simulations of BNSMs. In this way, it will be possible to systematically extract the associated macronova light curves and characterize their diversity. https://www.albanova.se/event/davide_gizzi/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 19/03: Sylvia Plöckinger (Leiden) 26/03: Matthew Kenworthy (Leiden) 02/04: Good friday =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Davide Gizzi Time: Mar 12, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/65499466134 Meeting ID: 654 9946 6134 One tap mobile +46844682488,,65499466134# Sweden +46850163827,,65499466134# Sweden Dial by your location +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden Meeting ID: 654 9946 6134 Find your local number: https://stockholmuniversity.zoom.us/u/cbFw9T6StF Join by SIP 65499466134 at 109.105.112.236 65499466134 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 654 9946 6134 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/65499466134 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Mar 15 15:13:19 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 15 Mar 2021 14:13:19 +0000 Subject: [Astronomy seminar] =?utf-8?q?Astronomy_seminar_via_zoom=2C_19_Ma?= =?utf-8?q?rch_10=3A30=3A_Sylvia_Pl=C3=B6ckinger?= In-Reply-To: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> References: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> Message-ID: Dear all, On Friday March 19 at 10:30, we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Sylvia Plöckinger from the Leiden Observatory. Title: Cosmological simulations as laboratories to test theories on galaxy formation and particle physics Abstract: Simulations are an invaluable tool in astrophysics to test theories relating to processes that take millions and billions of years. Within the last decades, cosmological simulations have drastically improved on their power to compare simulation with observations: from simulations only tracing the gravitational effects of cosmic structure formation ("dark matter only / N-body simulations") to fully hydro-dynamic simulations that form galaxy populations resembling observed galaxies. An upcoming new generation of cosmological simulations further advances the opportunities for a more direct comparison to observed galaxies. This is not only achieved by an increased mass and spatial resolution, but also by an innovative physical and chemical model of the gas phases of the interstellar medium (ionized, neutral atomic, molecular). This allows to self-consistently model the multi-phase interstellar medium (ISM) and produce more realistic mock observations. I will present first results of these new simulations and show how a multi-phase ISM can impact some of the small-scale challenges of the current standard cosmological model. This improved model for baryon physics also allows us to better study the impact on the formation of dwarf galaxies on the assumed dark matter particle. This will be illustrated by performing statistical test on the galaxy populations within cold and warm (sterile neutrino) dark matter simulations. https://www.albanova.se/event/sylvia_ploeckinger/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 26/03: Matthew Kenworthy (Leiden) 02/04: Good friday 09/04: Patrick Antolin (Northumbria University) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Sylvia Ploeckinger Time: Mar 19, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/64969984591 Meeting ID: 649 6998 4591 One tap mobile +46850539728,,64969984591# Sweden +46844682488,,64969984591# Sweden Dial by your location +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden Meeting ID: 649 6998 4591 Find your local number: https://stockholmuniversity.zoom.us/u/ctiFBg7Cu Join by SIP 64969984591 at 109.105.112.236 64969984591 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 649 6998 4591 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/64969984591 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Mar 19 10:02:57 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 19 Mar 2021 09:02:57 +0000 Subject: [Astronomy seminar] =?utf-8?b?W2FsbGFAYXN0cm8uc3Uuc2VdIEFzdHJv?= =?utf-8?q?nomy_seminar_via_zoom=2C_=22today=22_10=3A30=3A_Sylvia_Pl=C3=B6?= =?utf-8?q?ckinger?= In-Reply-To: <1645B07A-53EF-4945-9AB6-C847A2A6341F@astro.su.se> References: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> <1645B07A-53EF-4945-9AB6-C847A2A6341F@astro.su.se> Message-ID: Hi All, Here is a reminder our seminar is coming soon in 28 mins! Topic: Astronomy Seminar Sylvia Ploeckinger Time: Mar 19, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/64969984591 Cheers, Matthias & Janet On 15 Mar 2021, at 15:13, Janet Ting-Wan Chen > wrote: Dear all, On Friday March 19 at 10:30, we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Sylvia Plöckinger from the Leiden Observatory. Title: Cosmological simulations as laboratories to test theories on galaxy formation and particle physics Abstract: Simulations are an invaluable tool in astrophysics to test theories relating to processes that take millions and billions of years. Within the last decades, cosmological simulations have drastically improved on their power to compare simulation with observations: from simulations only tracing the gravitational effects of cosmic structure formation ("dark matter only / N-body simulations") to fully hydro-dynamic simulations that form galaxy populations resembling observed galaxies. An upcoming new generation of cosmological simulations further advances the opportunities for a more direct comparison to observed galaxies. This is not only achieved by an increased mass and spatial resolution, but also by an innovative physical and chemical model of the gas phases of the interstellar medium (ionized, neutral atomic, molecular). This allows to self-consistently model the multi-phase interstellar medium (ISM) and produce more realistic mock observations. I will present first results of these new simulations and show how a multi-phase ISM can impact some of the small-scale challenges of the current standard cosmological model. This improved model for baryon physics also allows us to better study the impact on the formation of dwarf galaxies on the assumed dark matter particle. This will be illustrated by performing statistical test on the galaxy populations within cold and warm (sterile neutrino) dark matter simulations. https://www.albanova.se/event/sylvia_ploeckinger/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 26/03: Matthew Kenworthy (Leiden) 02/04: Good friday 09/04: Patrick Antolin (Northumbria University) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Sylvia Ploeckinger Time: Mar 19, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/64969984591 Meeting ID: 649 6998 4591 One tap mobile +46850539728,,64969984591# Sweden +46844682488,,64969984591# Sweden Dial by your location +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden Meeting ID: 649 6998 4591 Find your local number: https://stockholmuniversity.zoom.us/u/ctiFBg7Cu Join by SIP 64969984591 at 109.105.112.236 64969984591 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 649 6998 4591 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/64969984591 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Mar 22 10:39:53 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 22 Mar 2021 09:39:53 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 26 March 10:30: Matthew Kenworthy Message-ID: Dear all, On Friday March 26 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Matthew Kenworthy from Leiden Observatory, The Netherlands. Title: Seeing the shadows of circumplanetary disks: the cases of J1407 and J0600 Abstract: Gas giant planets form by the transfer of material from the circumstellar disk, through a circumplanetary disk (CPD) and onto the planet. In the last stages of formation, the circumstellar material is exhausted and the remaining CPD accretes onto the gas giant planet, with moons forming and carving out transient ring-like structures in the planet's Hill sphere. These exorings can be hundreds of times larger than Saturn's rings, up to one astronomical unit in diameter. In 2015, the young star J1407 underwent a complex and deep 56 day eclipse that had photometric variations down to timescales of hours. We interpret this as the transit of a giant ring system within the Hill sphere of a substellar companion. Amongst the follow up observations, the ALMA array detected a sub-mm source consistent with emission from warm dust in a giant ring system near J1407, and over the past year, we have been intensively monitoring another potential transiting ring system towards the nearby star J0600. In this talk we discuss our observations of J1407 and J0600, and show how they can provide insight into the last stages of giant planet and moon formation. https://www.albanova.se/event/matthew_kenworthy/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 02/04: Good Friday (holiday) 09/04: Patrick Antolin (Northumbria University, Newcastle, UK) 16/04: Paul Molliere (Max Planck Institute for Astronomy, Heidelberg, Germany) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/64716729733 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Mar 26 09:26:14 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 26 Mar 2021 08:26:14 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 26 March 10:30: Matthew Kenworthy In-Reply-To: <07fcf1eb4919411f856eb2df79cdab17@astro.su.se> References: <07fcf1eb4919411f856eb2df79cdab17@astro.su.se> Message-ID: Reminder: Seminar with Matthew Kenworthy today at 10:30, i.e. in ~1 hour. ________________________________ From: Matthias Samland Sent: Monday, March 22, 2021 10:39 AM Subject: Astronomy seminar via zoom, 26 March 10:30: Matthew Kenworthy Dear all, On Friday March 26 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Matthew Kenworthy from Leiden Observatory, The Netherlands. Title: Seeing the shadows of circumplanetary disks: the cases of J1407 and J0600 Abstract: Gas giant planets form by the transfer of material from the circumstellar disk, through a circumplanetary disk (CPD) and onto the planet. In the last stages of formation, the circumstellar material is exhausted and the remaining CPD accretes onto the gas giant planet, with moons forming and carving out transient ring-like structures in the planet's Hill sphere. These exorings can be hundreds of times larger than Saturn's rings, up to one astronomical unit in diameter. In 2015, the young star J1407 underwent a complex and deep 56 day eclipse that had photometric variations down to timescales of hours. We interpret this as the transit of a giant ring system within the Hill sphere of a substellar companion. Amongst the follow up observations, the ALMA array detected a sub-mm source consistent with emission from warm dust in a giant ring system near J1407, and over the past year, we have been intensively monitoring another potential transiting ring system towards the nearby star J0600. In this talk we discuss our observations of J1407 and J0600, and show how they can provide insight into the last stages of giant planet and moon formation. https://www.albanova.se/event/matthew_kenworthy/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 02/04: Good Friday (holiday) 09/04: Patrick Antolin (Northumbria University, Newcastle, UK) 16/04: Paul Molliere (Max Planck Institute for Astronomy, Heidelberg, Germany) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/64716729733 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Apr 5 20:56:18 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 5 Apr 2021 18:56:18 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 9 April 10:30: Patrick Antolin In-Reply-To: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> References: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> Message-ID: Dear all, On Friday April 9 at 10:30, we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Patrick Antolin from the Northumbria University. Title: Nanojets of coronal heating Abstract: The solar corona is shaped and mysteriously heated to millions of degrees by the Sun’s magnetic field. It has long been hypothesized that the heating results from a myriad of tiny magnetic energy outbursts called nanoflares, driven by the fundamental process of magnetic reconnection. Misaligned magnetic field lines can break and reconnect, producing nanoflares in avalanche-like processes. However, no direct and unique observations of such nanoflares exist to date, and the lack of a smoking gun has cast doubt on the possibility of solving the coronal heating problem. From coordinated multi-band high-resolution observations, we report on the discovery of very fast and bursty nanojets, the telltale signature of reconnection-based nanoflares resulting in coronal heating. The nanojet is uniquely characterised by being transverse to the loop and appears as a unidirectional jet from the reconnection point. Isolated and clustered nanojets are detected, and a myriad are observed in an avalanche-like progression, leading to the formation of a coronal loop. Using state-of-the-art numerical simulations, we demonstrate that the nanojet is a consequence of the slingshot effect from the magnetically tensed, curved magnetic field lines reconnecting at small angles. Nanojets are therefore the key signature of reconnection-based coronal heating in action. https://www.albanova.se/event/patrick_antolin/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 16/04: Paul Molliere (MPIA) 23/04: Marta Reina-Campos (McMaster University) *talk time at 2pm CEST* 30/04: Alexis Brandeker (SU) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Patrick Antolin Time: Apr 9, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/67529299504 Meeting ID: 675 2929 9504 One tap mobile +46850500828,,67529299504# Sweden +46850500829,,67529299504# Sweden Dial by your location +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden Meeting ID: 675 2929 9504 Find your local number: https://stockholmuniversity.zoom.us/u/cbUlDyMqb2 Join by SIP 67529299504 at 109.105.112.236 67529299504 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 675 2929 9504 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/67529299504 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Apr 9 10:11:38 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 9 Apr 2021 08:11:38 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 9 April 10:30: Patrick Antolin In-Reply-To: <937C4F84-EF18-4F54-A4E8-53542FF02A6F@astro.su.se> References: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se>, <937C4F84-EF18-4F54-A4E8-53542FF02A6F@astro.su.se> Message-ID: Reminder: Seminar with Patrick Antoli at 10:30 today (in 20 minutes) ________________________________ From: Alla-at-astro.su.se on behalf of Janet Ting-Wan Chen Sent: Monday, April 5, 2021 8:56:18 PM Subject: [alla at astro.su.se] Astronomy seminar via zoom, 9 April 10:30: Patrick Antolin Dear all, On Friday April 9 at 10:30, we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Patrick Antolin from the Northumbria University. Title: Nanojets of coronal heating Abstract: The solar corona is shaped and mysteriously heated to millions of degrees by the Sun’s magnetic field. It has long been hypothesized that the heating results from a myriad of tiny magnetic energy outbursts called nanoflares, driven by the fundamental process of magnetic reconnection. Misaligned magnetic field lines can break and reconnect, producing nanoflares in avalanche-like processes. However, no direct and unique observations of such nanoflares exist to date, and the lack of a smoking gun has cast doubt on the possibility of solving the coronal heating problem. From coordinated multi-band high-resolution observations, we report on the discovery of very fast and bursty nanojets, the telltale signature of reconnection-based nanoflares resulting in coronal heating. The nanojet is uniquely characterised by being transverse to the loop and appears as a unidirectional jet from the reconnection point. Isolated and clustered nanojets are detected, and a myriad are observed in an avalanche-like progression, leading to the formation of a coronal loop. Using state-of-the-art numerical simulations, we demonstrate that the nanojet is a consequence of the slingshot effect from the magnetically tensed, curved magnetic field lines reconnecting at small angles. Nanojets are therefore the key signature of reconnection-based coronal heating in action. https://www.albanova.se/event/patrick_antolin/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 16/04: Paul Molliere (MPIA) 23/04: Marta Reina-Campos (McMaster University) *talk time at 2pm CEST* 30/04: Alexis Brandeker (SU) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Patrick Antolin Time: Apr 9, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/67529299504 Meeting ID: 675 2929 9504 One tap mobile +46850500828,,67529299504# Sweden +46850500829,,67529299504# Sweden Dial by your location +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden Meeting ID: 675 2929 9504 Find your local number: https://stockholmuniversity.zoom.us/u/cbUlDyMqb2 Join by SIP 67529299504 at 109.105.112.236 67529299504 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 675 2929 9504 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/67529299504 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Apr 12 13:20:54 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 12 Apr 2021 11:20:54 +0000 Subject: [Astronomy seminar] =?windows-1252?q?Astronomy_seminar_via_zoom?= =?windows-1252?q?=2C_16_April_10=3A30=3A_Paul_Molli=E8re?= Message-ID: Dear all, On Friday April 16 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Paul Mollière from the Max Planck Institute for Astronomy, Heidelberg, Germany. Title: From atmospheric to planet formation retrievals Abstract: With new and upcoming observing facilities (JWST and the ELTs), the exoplanet community is poised to precisely measure the chemical inventory of exoplanet atmospheres. This will allow, for the first time, to start investigating whether one of the greatest promises of atmospheric characterization studies holds up: inverting the atmospheric composition to infer the planet formation history encoded in it. In my talk, I will show how such measurements allow to run so-called formation retrievals, which constrain a planet’s formation history using its atmospheric abundances in a Bayesian retrieval framework. I will demonstrate how simple and popular models for the composition of the protoplanetary disk and planet formation could lead to interesting insights when applied in formation retrievals. At the same time, I will discuss how such assumptions are too strongly simplified for making the exoplanet atmosphere -- formation connection in practice, and what the most pressing theoretical challenges are. Achieving this connection will be a formidable and interdisciplinary challenge, but the exciting exoplanet observations that lie ahead will allow the community to tackle it in earnest. https://www.albanova.se/event/paul_molliere/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 23/04 (2 pm!): Marta Reina-Campos (McMaster University, Hamilton, Canada) 30/04: Alexis Brandeker (Stockholm University) 07/05: Kristopher Youakim (Stockholm University) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/65438662202 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Apr 16 09:09:41 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 16 Apr 2021 07:09:41 +0000 Subject: [Astronomy seminar] =?windows-1252?q?=5Balla=40astro=2Esu=2Ese?= =?windows-1252?q?=5D_Astronomy_seminar_via_zoom=2C_16_April_10=3A30=3A_Pa?= =?windows-1252?q?ul_Molli=E8re?= In-Reply-To: References: Message-ID: Reminder: Friday astronomy seminar today at 10:30 am with Paul Mollière. Participation link: https://stockholmuniversity.zoom.us/j/65438662202 ________________________________ From: Alla-at-astro.su.se on behalf of Matthias Samland Sent: Monday, April 12, 2021 1:20:54 PM Subject: [alla at astro.su.se] Astronomy seminar via zoom, 16 April 10:30: Paul Mollière Dear all, On Friday April 16 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Paul Mollière from the Max Planck Institute for Astronomy, Heidelberg, Germany. Title: From atmospheric to planet formation retrievals Abstract: With new and upcoming observing facilities (JWST and the ELTs), the exoplanet community is poised to precisely measure the chemical inventory of exoplanet atmospheres. This will allow, for the first time, to start investigating whether one of the greatest promises of atmospheric characterization studies holds up: inverting the atmospheric composition to infer the planet formation history encoded in it. In my talk, I will show how such measurements allow to run so-called formation retrievals, which constrain a planet’s formation history using its atmospheric abundances in a Bayesian retrieval framework. I will demonstrate how simple and popular models for the composition of the protoplanetary disk and planet formation could lead to interesting insights when applied in formation retrievals. At the same time, I will discuss how such assumptions are too strongly simplified for making the exoplanet atmosphere -- formation connection in practice, and what the most pressing theoretical challenges are. Achieving this connection will be a formidable and interdisciplinary challenge, but the exciting exoplanet observations that lie ahead will allow the community to tackle it in earnest. https://www.albanova.se/event/paul_molliere/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 23/04 (2 pm!): Marta Reina-Campos (McMaster University, Hamilton, Canada) 30/04: Alexis Brandeker (Stockholm University) 07/05: Kristopher Youakim (Stockholm University) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/65438662202 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Apr 19 14:17:01 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 19 Apr 2021 12:17:01 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 23 April 14:00: Marta Reina-Campos In-Reply-To: <1645B07A-53EF-4945-9AB6-C847A2A6341F@astro.su.se> References: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> <1645B07A-53EF-4945-9AB6-C847A2A6341F@astro.su.se> Message-ID: Dear all, On Friday April 23 at **14:00**, we will have the next Astronomy Seminar, remotely via zoom. Please be aware of the time change of this seminar, only one time change, we will be back to normal 10:30 schedule next week. Our speaker is Marta Reina-Campos from the McMaster University, Canada. Title: Modelling massive stellar cluster formation and evolution in a cosmic environment Abstract: Stellar clusters are present in the local Universe in a variety of environments, from the current cluster formation sites in the disks of the Antennae galaxies to the old GC population that mostly populates the halo of the Milky Way. This implies that their evolution is tightly linked to that of their host galaxy. To understand the observed cluster populations, I will discuss the hypothesis that GCs are the relics of regular cluster formation at high redshift that survived until the present day. For that, I'll use the suite of 25 present day Milky Way-mass cosmological zoom-in simulations from E-MOSAICS project (Pfeffer+2018, Kruijssen+2019). These simulations enable the self-consistent study of the formation and co-evolution of stellar clusters and their host galaxies through cosmic time. I will show that GC populations trace the DM halo of their host galaxies, opening a novel avenue to explore the structure of DM haloes beyond the Local Group. Lastly, I will also discuss how this description can be improved by considering the formation and evolution of stellar clusters in the cold and dense cosmic environments of the EMP-Pathfinder simulations (Reina-Campos+ in prep.). https://www.albanova.se/event/marta_reina-campos/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 13:50, please join at least a few minutes early as we would like to start 14:00 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 30/04: Alexis Brandeker (Stockholm University) 07/05: Kristopher Youakim (Stockholm University) 14/05: Klämdag =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Marta Reina-Campos Time: Apr 23, 2021 02:00 PM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/63117038323?pwd=ZW1vZXFoU2orKzBkaEx4dlNncGJ1dz09 Meeting ID: 631 1703 8323 Passcode: 546834 One tap mobile +46850539728,,63117038323#,,,,*546834# Sweden +46844682488,,63117038323#,,,,*546834# Sweden Dial by your location +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden Meeting ID: 631 1703 8323 Passcode: 546834 Find your local number: https://stockholmuniversity.zoom.us/u/cbPtmC5y5E Join by SIP 63117038323 at 109.105.112.236 63117038323 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 631 1703 8323 Passcode: 546834 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/63117038323 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Apr 23 10:26:57 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 23 Apr 2021 08:26:57 +0000 Subject: [Astronomy seminar] [alla@astro.su.se] Astronomy seminar via zoom, today 14:00: Marta Reina-Campos In-Reply-To: <1AD44B53-BE61-4302-9AFD-207C334168EF@astro.su.se> References: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> <1645B07A-53EF-4945-9AB6-C847A2A6341F@astro.su.se> <1AD44B53-BE61-4302-9AFD-207C334168EF@astro.su.se> Message-ID: Hi All, Here is a reminder for today’s seminar, at 14:00! See you this afternoon! Join Zoom Meeting https://stockholmuniversity.zoom.us/j/63117038323?pwd=ZW1vZXFoU2orKzBkaEx4dlNncGJ1dz09 Cheers, Matthias & Janet On 19 Apr 2021, at 14:17, Janet Ting-Wan Chen > wrote: Dear all, On Friday April 23 at **14:00**, we will have the next Astronomy Seminar, remotely via zoom. Please be aware of the time change of this seminar, only one time change, we will be back to normal 10:30 schedule next week. Our speaker is Marta Reina-Campos from the McMaster University, Canada. Title: Modelling massive stellar cluster formation and evolution in a cosmic environment Abstract: Stellar clusters are present in the local Universe in a variety of environments, from the current cluster formation sites in the disks of the Antennae galaxies to the old GC population that mostly populates the halo of the Milky Way. This implies that their evolution is tightly linked to that of their host galaxy. To understand the observed cluster populations, I will discuss the hypothesis that GCs are the relics of regular cluster formation at high redshift that survived until the present day. For that, I'll use the suite of 25 present day Milky Way-mass cosmological zoom-in simulations from E-MOSAICS project (Pfeffer+2018, Kruijssen+2019). These simulations enable the self-consistent study of the formation and co-evolution of stellar clusters and their host galaxies through cosmic time. I will show that GC populations trace the DM halo of their host galaxies, opening a novel avenue to explore the structure of DM haloes beyond the Local Group. Lastly, I will also discuss how this description can be improved by considering the formation and evolution of stellar clusters in the cold and dense cosmic environments of the EMP-Pathfinder simulations (Reina-Campos+ in prep.). https://www.albanova.se/event/marta_reina-campos/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 13:50, please join at least a few minutes early as we would like to start 14:00 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 30/04: Alexis Brandeker (Stockholm University) 07/05: Kristopher Youakim (Stockholm University) 14/05: Klämdag =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Marta Reina-Campos Time: Apr 23, 2021 02:00 PM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/63117038323?pwd=ZW1vZXFoU2orKzBkaEx4dlNncGJ1dz09 Meeting ID: 631 1703 8323 Passcode: 546834 One tap mobile +46850539728,,63117038323#,,,,*546834# Sweden +46844682488,,63117038323#,,,,*546834# Sweden Dial by your location +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden Meeting ID: 631 1703 8323 Passcode: 546834 Find your local number: https://stockholmuniversity.zoom.us/u/cbPtmC5y5E Join by SIP 63117038323 at 109.105.112.236 63117038323 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 631 1703 8323 Passcode: 546834 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/63117038323 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Apr 26 09:41:23 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 26 Apr 2021 07:41:23 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 30 April 10:30: Alexis Brandeker Message-ID: Dear all, On Friday April 30 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Alexis Brandeker from Stockholm University, Sweden. Title: A new era of exoplanet characterisation – CHEOPS first results from a year in space Abstract: After millennia of speculation, the first discovery of an exoplanet came as a shock. It was not that many doubted that planets orbit stars other than the Sun, but the kind of planet was totally unexpected and different from anything known in the solar system. Since then, several thousands of exoplanets have been found and most of them quite different from the planets in the solar system; not because solar system-like planets are necessarily that rare, but it turns out that they are relatively difficult to discover. From the early phase of exoplanet discovery, the field has now turned to exoplanet characterisation – to better understand what kind of planets there are. The Swiss-lead ESA space telescope CHEOPS (Characterising ExOPlanet Satellite) is an ultra-high precision photometer designed to measure known exoplanets transiting in front of their stars, and in some cases, eclipsing behind them. In combination with other data, we get to know the nearby planets in more detail than ever before. In this talk I will give context and present results from CHEOPS first year in space, high-light Swedish contributions, and reflect on what we can expect from the years to come. https://www.albanova.se/event/alexis_brandeker/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 30/04: Alexis Brandeker (Stockholm University) 07/05: Kristopher Youakim (Stockholm University) 14/05: Klämdag (holiday) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/65149088240 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Apr 26 10:28:24 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 26 Apr 2021 08:28:24 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 30 April 10:30: Alexis Brandeker In-Reply-To: References: Message-ID: Dear all, Apologies, the link in my previous email to the website of Alexis Brandeker's talk this Friday points to the website of last week's talk. Corrected link (href) here: https://www.albanova.se/event/alexis_brandeker/ Upcoming events: 30/04: Alexis Brandeker (Stockholm University) 07/05: Kristopher Youakim (Stockholm University) 14/05: Klämdag (holiday) 21/05: Franz Kirsten (Chalmers University of Technology, Gothenberg, Sweden) ________________________________ From: Alla-at-astro.su.se on behalf of Matthias Samland Sent: Monday, April 26, 2021 9:41:23 AM Subject: [alla at astro.su.se] Astronomy seminar via zoom, 30 April 10:30: Alexis Brandeker Dear all, On Friday April 30 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Alexis Brandeker from Stockholm University, Sweden. Title: A new era of exoplanet characterisation – CHEOPS first results from a year in space Abstract: After millennia of speculation, the first discovery of an exoplanet came as a shock. It was not that many doubted that planets orbit stars other than the Sun, but the kind of planet was totally unexpected and different from anything known in the solar system. Since then, several thousands of exoplanets have been found and most of them quite different from the planets in the solar system; not because solar system-like planets are necessarily that rare, but it turns out that they are relatively difficult to discover. From the early phase of exoplanet discovery, the field has now turned to exoplanet characterisation – to better understand what kind of planets there are. The Swiss-lead ESA space telescope CHEOPS (Characterising ExOPlanet Satellite) is an ultra-high precision photometer designed to measure known exoplanets transiting in front of their stars, and in some cases, eclipsing behind them. In combination with other data, we get to know the nearby planets in more detail than ever before. In this talk I will give context and present results from CHEOPS first year in space, high-light Swedish contributions, and reflect on what we can expect from the years to come. https://www.albanova.se/event/alexis_brandeker/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 30/04: Alexis Brandeker (Stockholm University) 07/05: Kristopher Youakim (Stockholm University) 14/05: Klämdag (holiday) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/65149088240 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Apr 30 09:37:59 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 30 Apr 2021 07:37:59 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 30 April 10:30: Alexis Brandeker In-Reply-To: References: , Message-ID: Reminder: Astronomy seminar by Alexis Brandeker today at 10:30 am (in 1 hour). https://stockholmuniversity.zoom.us/j/65149088240 ________________________________ From: Matthias Samland Sent: Monday, April 26, 2021 10:28 AM Subject: Re: Astronomy seminar via zoom, 30 April 10:30: Alexis Brandeker Dear all, Apologies, the link in my previous email to the website of Alexis Brandeker's talk this Friday points to the website of last week's talk. Corrected link (href) here: https://www.albanova.se/event/alexis_brandeker/ Upcoming events: 30/04: Alexis Brandeker (Stockholm University) 07/05: Kristopher Youakim (Stockholm University) 14/05: Klämdag (holiday) 21/05: Franz Kirsten (Chalmers University of Technology, Gothenberg, Sweden) ________________________________ From: Alla-at-astro.su.se on behalf of Matthias Samland Sent: Monday, April 26, 2021 9:41:23 AM Subject: [alla at astro.su.se] Astronomy seminar via zoom, 30 April 10:30: Alexis Brandeker Dear all, On Friday April 30 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Alexis Brandeker from Stockholm University, Sweden. Title: A new era of exoplanet characterisation – CHEOPS first results from a year in space Abstract: After millennia of speculation, the first discovery of an exoplanet came as a shock. It was not that many doubted that planets orbit stars other than the Sun, but the kind of planet was totally unexpected and different from anything known in the solar system. Since then, several thousands of exoplanets have been found and most of them quite different from the planets in the solar system; not because solar system-like planets are necessarily that rare, but it turns out that they are relatively difficult to discover. From the early phase of exoplanet discovery, the field has now turned to exoplanet characterisation – to better understand what kind of planets there are. The Swiss-lead ESA space telescope CHEOPS (Characterising ExOPlanet Satellite) is an ultra-high precision photometer designed to measure known exoplanets transiting in front of their stars, and in some cases, eclipsing behind them. In combination with other data, we get to know the nearby planets in more detail than ever before. In this talk I will give context and present results from CHEOPS first year in space, high-light Swedish contributions, and reflect on what we can expect from the years to come. https://www.albanova.se/event/alexis_brandeker/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 30/04: Alexis Brandeker (Stockholm University) 07/05: Kristopher Youakim (Stockholm University) 14/05: Klämdag (holiday) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/65149088240 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon May 3 16:11:58 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 3 May 2021 14:11:58 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 07 May 10:30: Kristopher Youakim Message-ID: Dear all, On Friday May 07 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Kristopher Youakim from Stockholm University, Sweden. Title: Galactic archaeology in the Milky Way: The stellar surveys that are changing the game Abstract: The Milky Way Galaxy is a prime place to study galaxy structure and evolution, since the Milky Way and its largest satellites are currently the only ones for which we can obtain detailed observations of the chemistry and kinematics of large numbers of individual stars. Our understanding of the formation and evolution of our Galaxy has been steadily increasing over the past decades, but we are about to enter a new era. Thanks to the ESA Gaia mission, and upcoming large-scale spectroscopic surveys such as WEAVE and 4MOST, we will soon have access to vast data sets of high quality photometry, astrometry, and spectroscopy for many millions of stars which will help to reveal intimate details of our Galaxy’s past like never before. In this talk, I will discuss how metal-poor stars and galactic stellar substructure are important tracers of chemical evolution and the accretion history of our Galaxy, and how we are preparing to utilize the wealth of data from upcoming large-scale surveys to further Galactic archaeology studies. In particular, I will discuss searching for the most metal-poor stars, the perceived paucity of metal-poor globular clusters, and ongoing work using dimensionality reduction algorithms to identify new members of Milky Way star clusters and accreted halo structures. https://www.albanova.se/event/kristopher_youakim/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 14/05: Klämdag (holiday) 21/05: Franz Kirsten (Chalmers University of Technology, Gothenburg, Sweden) 28/05: Johannes Puschnig (Stockholm University, Sweden) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/64845813048 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri May 7 09:24:39 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 7 May 2021 07:24:39 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 07 May 10:30: Kristopher Youakim In-Reply-To: <3ca9791b074745da938382846aad38f8@astro.su.se> References: <3ca9791b074745da938382846aad38f8@astro.su.se> Message-ID: Reminder: Astronomy seminar today at 10:30 am (CET) by Kristopher Youakim (in 60 minutes). See you soon! https://stockholmuniversity.zoom.us/j/64845813048 ________________________________ From: Alla-at-astro.su.se on behalf of Matthias Samland Sent: Monday, May 3, 2021 4:11 PM Subject: [alla at astro.su.se] Astronomy seminar via zoom, 07 May 10:30: Kristopher Youakim Dear all, On Friday May 07 at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Kristopher Youakim from Stockholm University, Sweden. Title: Galactic archaeology in the Milky Way: The stellar surveys that are changing the game Abstract: The Milky Way Galaxy is a prime place to study galaxy structure and evolution, since the Milky Way and its largest satellites are currently the only ones for which we can obtain detailed observations of the chemistry and kinematics of large numbers of individual stars. Our understanding of the formation and evolution of our Galaxy has been steadily increasing over the past decades, but we are about to enter a new era. Thanks to the ESA Gaia mission, and upcoming large-scale spectroscopic surveys such as WEAVE and 4MOST, we will soon have access to vast data sets of high quality photometry, astrometry, and spectroscopy for many millions of stars which will help to reveal intimate details of our Galaxy’s past like never before. In this talk, I will discuss how metal-poor stars and galactic stellar substructure are important tracers of chemical evolution and the accretion history of our Galaxy, and how we are preparing to utilize the wealth of data from upcoming large-scale surveys to further Galactic archaeology studies. In particular, I will discuss searching for the most metal-poor stars, the perceived paucity of metal-poor globular clusters, and ongoing work using dimensionality reduction algorithms to identify new members of Milky Way star clusters and accreted halo structures. https://www.albanova.se/event/kristopher_youakim/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 14/05: Klämdag (holiday) 21/05: Franz Kirsten (Chalmers University of Technology, Gothenburg, Sweden) 28/05: Johannes Puschnig (Stockholm University, Sweden) =================================================== Participation link: https://stockholmuniversity.zoom.us/j/64845813048 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon May 17 14:00:59 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 17 May 2021 12:00:59 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 21 May 10:30: Franz Kirsten In-Reply-To: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> References: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> Message-ID: Dear all, On Friday 21st May at 10:30, we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Franz Kirsten from the Chalmers University of Technology. Title: Towards understanding fast radio bursts -- activities at and recent results from Onsala Space Observatory Abstract: Fast radio burst are bright, millisecond-duration flashes of extragalactic origin, so far only observed at centimeter- to meter-wavelengths. The vast majority of the roughly 150 published FRBs have only ever been seen once, roughly 20 are known to burst repeatedly, but do so in an unpredictable way. Key ingredients in understanding the source and physical origin of the emission are the environments the bursts are generated in and their spectro-polarimetric properties. In this talk I will summarize the field and discuss the efforts that we conduct at Onsala Space Observatory. Besides running a VLBI-campaign to precisely localise FRBs, we also perform multi-telescope, multi-band observations in collaboration with Westerbork (NL) and Torun (Poland). In 2020 we detected FRB-like bursts from a Galactic magnetar and, most recently, we precisely localised two FRBs. https://www.albanova.se/event/franz_kirsten/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 28/05: Johannes Puschnig (PhD seminar) 4/6: Deborah Baker (UCL) 11/6: Nushkia Chamba (SU) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Franz Kirsten Time: May 21, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/64148584924 Meeting ID: 641 4858 4924 One tap mobile +46850500828,,64148584924# Sweden +46850500829,,64148584924# Sweden Dial by your location +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden Meeting ID: 641 4858 4924 Find your local number: https://stockholmuniversity.zoom.us/u/co8Bm6Km6 Join by SIP 64148584924 at 109.105.112.236 64148584924 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 641 4858 4924 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/64148584924 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri May 21 10:18:26 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 21 May 2021 08:18:26 +0000 Subject: [Astronomy seminar] [alla@astro.su.se] Astronomy seminar via zoom, 21 May 10:30: Franz Kirsten In-Reply-To: References: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> Message-ID: Hi All, The talk will start in 12mins! See you soon, Janet On 17 May 2021, at 14:00, Janet Ting-Wan Chen > wrote: Dear all, On Friday 21st May at 10:30, we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Franz Kirsten from the Chalmers University of Technology. Title: Towards understanding fast radio bursts -- activities at and recent results from Onsala Space Observatory Abstract: Fast radio burst are bright, millisecond-duration flashes of extragalactic origin, so far only observed at centimeter- to meter-wavelengths. The vast majority of the roughly 150 published FRBs have only ever been seen once, roughly 20 are known to burst repeatedly, but do so in an unpredictable way. Key ingredients in understanding the source and physical origin of the emission are the environments the bursts are generated in and their spectro-polarimetric properties. In this talk I will summarize the field and discuss the efforts that we conduct at Onsala Space Observatory. Besides running a VLBI-campaign to precisely localise FRBs, we also perform multi-telescope, multi-band observations in collaboration with Westerbork (NL) and Torun (Poland). In 2020 we detected FRB-like bursts from a Galactic magnetar and, most recently, we precisely localised two FRBs. https://www.albanova.se/event/franz_kirsten/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 28/05: Johannes Puschnig (PhD seminar) 4/6: Deborah Baker (UCL) 11/6: Nushkia Chamba (SU) =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Franz Kirsten Time: May 21, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/64148584924 Meeting ID: 641 4858 4924 One tap mobile +46850500828,,64148584924# Sweden +46850500829,,64148584924# Sweden Dial by your location +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden Meeting ID: 641 4858 4924 Find your local number: https://stockholmuniversity.zoom.us/u/co8Bm6Km6 Join by SIP 64148584924 at 109.105.112.236 64148584924 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 641 4858 4924 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/64148584924 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon May 24 21:37:36 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 24 May 2021 19:37:36 +0000 Subject: [Astronomy seminar] Astronomy PhD seminar via zoom, 28 May 10:30: Johannes Puschnig In-Reply-To: <1645B07A-53EF-4945-9AB6-C847A2A6341F@astro.su.se> References: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> <1645B07A-53EF-4945-9AB6-C847A2A6341F@astro.su.se> Message-ID: Dear all, On Friday May 28 at 10:30, we will have the next Astronomy PhD Seminar, remotely via zoom. Our speaker is Johannes Puschnig from the Stockholm University. Title: Molecular gas and ionizing radiation in star-forming galaxies Abstract: I present the main findings of my PhD work. Using panchromatic observations ranging from the 21cm H I line in the radio regime to the extreme ultraviolet (UV), we studied ionizing radiation from massive stars (direct and through hydrogen recombination lines) as well as the atomic and molecular gas content in 15 highly star-forming local galaxies. The results are brought into cosmological context, taking a step forward towards finding answers to the following open questions in galaxy evolution: Which physical conditions enable galaxies to leak ionizing radiation (and power reionization)? What drives the high Lyman-alpha escape fractions observed in the early Universe? How did the massive stellar clumps found in high redshift galaxies have possibly formed? One of the galaxies we studied is Tololo 1247-232, a galaxy that leaks ionizing radiation. We argue that the Lyman continuum escape in Tololo 1247-232 is facilitated by the large amount of ionizing radiation that is produced in the central region and then escapes from clumpy, density bounded regions. This scenario may also explain how early galaxies at z>6 have powered cosmic reionization. Additionally, we performed infrared and molecular gas (traced by CO) observations of galaxies drawn from the "Lyman Alpha Reference Sample'' (LARS). The galaxies were selected as analogues of high-redshift galaxies. Our main discovery is a roughly linear trend between the Lyman-alpha escape fraction and the total gas depletion time. This finding is counter-intuitive, because given the resonant scattering nature of Lyman-alpha photons, an increase in atomic gas should result in longer path lengths out of the galaxy, making photons more prone to absorption. Some other process seems to facilitate Lyman-alpha escape. We speculate that gas accretion enhances the turbulence of the cold gas and shifts the Lyman-alpha photons out of resonance. This scenario would naturally explain elevated Lyman-alpha escape fractions during the phases in cosmic history when galaxies were still accretion-dominated (at high-z) rather than defined by gas depletion. Finally, we present high-resolution interferometric observations of a single galaxy, LARS 8. The galaxy is a proto-typical analogue of normal star-forming galaxies at z~1-2, i.e. it is massive, has a large gas fraction, is rotationally supported and its morphology is dominated by massive clumps. We show that these clumps are the result of an extremely gravitationally unstable gas disc. Large scale instabilities are found across the whole extent of the rotating disc, with only the innermost 500pc being stabilized by its bulgelike structure. Our findings prove that gravitational instabilities may play a significant role in galaxy evolution, in particular at z ≃ 1-3, when galaxies are characterized by massive clumps. https://www.albanova.se/event/johannes_puschnig/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 4/6: Deborah Baker (UCL) 11/6: Nushkia Chamba (SU) End of this semester's seminar =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Johannes Puschnig Time: May 28, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/66960083119 Meeting ID: 669 6008 3119 One tap mobile +46850539728,,66960083119# Sweden +46844682488,,66960083119# Sweden Dial by your location +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden Meeting ID: 669 6008 3119 Find your local number: https://stockholmuniversity.zoom.us/u/ccHMlLos03 Join by SIP 66960083119 at 109.105.112.236 66960083119 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 669 6008 3119 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/66960083119 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri May 28 09:45:38 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 28 May 2021 07:45:38 +0000 Subject: [Astronomy seminar] [alla@astro.su.se] Astronomy PhD seminar via zoom, 28 May 10:30: Johannes Puschnig In-Reply-To: <9E968B73-4EFD-4944-87BE-05DD74DA6FB4@astro.su.se> References: <87F84A21-359C-467D-ADA5-EF3B5E585534@astro.su.se> <1645B07A-53EF-4945-9AB6-C847A2A6341F@astro.su.se> <9E968B73-4EFD-4944-87BE-05DD74DA6FB4@astro.su.se> Message-ID: Hi All, Here is a reminder that our PhD seminar is in 45 mins! Join Zoom Meeting https://stockholmuniversity.zoom.us/j/66960083119 See you soon, Matthias & Janet On 24 May 2021, at 21:37, Janet Ting-Wan Chen > wrote: Dear all, On Friday May 28 at 10:30, we will have the next Astronomy PhD Seminar, remotely via zoom. Our speaker is Johannes Puschnig from the Stockholm University. Title: Molecular gas and ionizing radiation in star-forming galaxies Abstract: I present the main findings of my PhD work. Using panchromatic observations ranging from the 21cm H I line in the radio regime to the extreme ultraviolet (UV), we studied ionizing radiation from massive stars (direct and through hydrogen recombination lines) as well as the atomic and molecular gas content in 15 highly star-forming local galaxies. The results are brought into cosmological context, taking a step forward towards finding answers to the following open questions in galaxy evolution: Which physical conditions enable galaxies to leak ionizing radiation (and power reionization)? What drives the high Lyman-alpha escape fractions observed in the early Universe? How did the massive stellar clumps found in high redshift galaxies have possibly formed? One of the galaxies we studied is Tololo 1247-232, a galaxy that leaks ionizing radiation. We argue that the Lyman continuum escape in Tololo 1247-232 is facilitated by the large amount of ionizing radiation that is produced in the central region and then escapes from clumpy, density bounded regions. This scenario may also explain how early galaxies at z>6 have powered cosmic reionization. Additionally, we performed infrared and molecular gas (traced by CO) observations of galaxies drawn from the "Lyman Alpha Reference Sample'' (LARS). The galaxies were selected as analogues of high-redshift galaxies. Our main discovery is a roughly linear trend between the Lyman-alpha escape fraction and the total gas depletion time. This finding is counter-intuitive, because given the resonant scattering nature of Lyman-alpha photons, an increase in atomic gas should result in longer path lengths out of the galaxy, making photons more prone to absorption. Some other process seems to facilitate Lyman-alpha escape. We speculate that gas accretion enhances the turbulence of the cold gas and shifts the Lyman-alpha photons out of resonance. This scenario would naturally explain elevated Lyman-alpha escape fractions during the phases in cosmic history when galaxies were still accretion-dominated (at high-z) rather than defined by gas depletion. Finally, we present high-resolution interferometric observations of a single galaxy, LARS 8. The galaxy is a proto-typical analogue of normal star-forming galaxies at z~1-2, i.e. it is massive, has a large gas fraction, is rotationally supported and its morphology is dominated by massive clumps. We show that these clumps are the result of an extremely gravitationally unstable gas disc. Large scale instabilities are found across the whole extent of the rotating disc, with only the innermost 500pc being stabilized by its bulgelike structure. Our findings prove that gravitational instabilities may play a significant role in galaxy evolution, in particular at z ≃ 1-3, when galaxies are characterized by massive clumps. https://www.albanova.se/event/johannes_puschnig/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 4/6: Deborah Baker (UCL) 11/6: Nushkia Chamba (SU) End of this semester's seminar =================================================== Janet Ting-Wan Chen is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Johannes Puschnig Time: May 28, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/66960083119 Meeting ID: 669 6008 3119 One tap mobile +46850539728,,66960083119# Sweden +46844682488,,66960083119# Sweden Dial by your location +46 850 539 728 Sweden +46 8 4468 2488 Sweden +46 8 5016 3827 Sweden +46 8 5050 0828 Sweden +46 8 5050 0829 Sweden +46 8 5052 0017 Sweden Meeting ID: 669 6008 3119 Find your local number: https://stockholmuniversity.zoom.us/u/ccHMlLos03 Join by SIP 66960083119 at 109.105.112.236 66960083119 at 109.105.112.235 Join by H.323 109.105.112.236 109.105.112.235 Meeting ID: 669 6008 3119 Join by Skype for Business https://stockholmuniversity.zoom.us/skype/66960083119 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon May 31 12:45:41 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 31 May 2021 10:45:41 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 04 June 10:30: Deborah Baker Message-ID: Dear all, On Friday 04 June at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Deborah Baker from University College London, UK. Title: How can magnetic activity change the plasma composition of solar and stellar coronae? Abstract: Plasma composition in stellar coronae can differ from that of their photospheres. The cause of which is one of the open questions in astrophysics. As our nearest star, the Sun has long been used as a local laboratory, with measurements of its chemical composition providing a reference for comparable measurements of phenomena across the Universe. Fourteen years of spatially resolved spectroscopic observations provided by Hinode/EIS have fundamentally changed our understanding of how plasma composition in the solar corona varies in space and time depending on magnetic activity on all scales. I will discuss how magnetic wave activity in the solar lower atmosphere and reconnection beneath the solar surface can directly change the plasma composition we observe in the corona. The insight gained in our understanding of the processes in creating plasma composition variability in the solar atmosphere goes beyond solar physics, as it informs us about how and why the coronae of solar type stars and M dwarfs are dominated by different plasma composition. https://www.albanova.se/event/deborah_baker/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 11/06: Astronet webinar -> summer break =================================================== Participation link: https://stockholmuniversity.zoom.us/j/69354335160 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon May 31 13:05:13 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 31 May 2021 11:05:13 +0000 Subject: [Astronomy seminar] Astronomy Seminar cancellation for 11th June Message-ID: Dear All, We will cancel our last Astronomy Seminar on 11th June, and move this talk to next semester in fall. The reason of cancellation is our seminar time slot conflicts with the “Astronet” webinar. Astronet webinar 11 June 2021 - Defining a science vision and infrastructure roadmap for Europe: As a next step in developing a science vision, Astronet is holding a open webinar to present current status and seek further advice from the European astronomical community via the EAS. The webinar is hosted by the EAS and will take place on 11 June, from 8h00 to 13h30 UTC (ie 9h-14:30h UK, 10h-15h30 CEST). And we believe many researchers in the SU community will want to attend this. With this change of schedule, our last seminar will be on 4th June this week. More details of this seminar talk has been announced in the email "Astronomy seminar via zoom, 04 June 10:30: Deborah Baker”. We are looking forward to seeing you on Friday! Best wishes, Matthias & Janet -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Jun 4 09:28:40 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 4 Jun 2021 07:28:40 +0000 Subject: [Astronomy seminar] Astronomy seminar via zoom, 04 June 10:30: Deborah Baker In-Reply-To: <4e618d0e24904e179d7b1f94596fc617@astro.su.se> References: <4e618d0e24904e179d7b1f94596fc617@astro.su.se> Message-ID: Reminder: seminar talk by Deborah Baker at 10:30 am today (in 60 minutes) Participation link: https://stockholmuniversity.zoom.us/j/69354335160 ________________________________ From: Alla-at-astro.su.se on behalf of Matthias Samland Sent: Monday, May 31, 2021 12:45 PM Subject: [alla at astro.su.se] Astronomy seminar via zoom, 04 June 10:30: Deborah Baker Dear all, On Friday 04 June at 10:30 we will have the next Astronomy Seminar, remotely via zoom. Our speaker is Deborah Baker from University College London, UK. Title: How can magnetic activity change the plasma composition of solar and stellar coronae? Abstract: Plasma composition in stellar coronae can differ from that of their photospheres. The cause of which is one of the open questions in astrophysics. As our nearest star, the Sun has long been used as a local laboratory, with measurements of its chemical composition providing a reference for comparable measurements of phenomena across the Universe. Fourteen years of spatially resolved spectroscopic observations provided by Hinode/EIS have fundamentally changed our understanding of how plasma composition in the solar corona varies in space and time depending on magnetic activity on all scales. I will discuss how magnetic wave activity in the solar lower atmosphere and reconnection beneath the solar surface can directly change the plasma composition we observe in the corona. The insight gained in our understanding of the processes in creating plasma composition variability in the solar atmosphere goes beyond solar physics, as it informs us about how and why the coronae of solar type stars and M dwarfs are dominated by different plasma composition. https://www.albanova.se/event/deborah_baker/ We will have the colloquium using zoom. You will find the invitation at the end of this email. Some guidelines: 1) Join the session with your microphone muted. 2) When you have a question, press the “raise hand button” and wait till you are asked to ask your question. 3) The session will be online from 10:20, please join at least a few minutes early as we would like to start 10:30 sharp. We hope to see all of you there! Matthias & Janet Upcoming events: 11/06: Astronet webinar -> summer break =================================================== Participation link: https://stockholmuniversity.zoom.us/j/69354335160 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Aug 30 11:32:31 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 30 Aug 2021 11:32:31 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - September 3rd Conor Omand Message-ID: Hello On Friday the 3rd we will have the first astronomy seminar of the year with our own Conor Omand (Stockholm University) speaking via Zoom at 10:30. *Multiwavelength Signals from Pulsar-Driven Supernovae* The pulsar-driven supernova model, where the spin-down energy of a ~ms rotating highly magnetized neutron star powers the luminosity and/or dynamics of the supernova, can be used to explain a number of transients, most notably Type-I Super-Luminous Supernovae (SLSNe-I).  In this model, the energy from the pulsar is injected into the ejecta through broadband emission from the pulsar wind nebula (PWN).  There are several models which can explain SLSNe-I light curves, so quasi-thermal optical supernova emission can not differentiate between different central supernova engines, but this non-thermal PWN emission is unique to the pulsar engine.   We calculated the expected radio and millimetre PWN emission from several SLSNe-I, and then did follow-up observations to test these predictions.  We also investigated the effect of PWNe on dust formation and calculated the emission from grains heated by the PWN. We are trying something new this year with leaving the Zoom call open after the formal hour of the seminar is up to allow the speaker, if they wish, to chat informally with anyone who is interested. Thanks Chris and Tine Christopher Usher is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar Time: Sep 3, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/61688040328?pwd=czdtZVBxUkp1ekp4WFYxQUhLUkh4QT09 Meeting ID: 616 8804 0328 Passcode: c9gMQX28C -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Sep 6 12:08:21 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 6 Sep 2021 12:08:21 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - September 10th Sara Saracino Message-ID: Hello On Friday the 10th we have the second astronomy seminar of the year with Sara Saracino (Liverpool John Moores University) speaking via Zoom at 10:30. *Stellar-mass black holes in young star clusters: exciting news* Black holes (BHs) are among the most mysterious and elusive objects in the Universe. The recent discovery through gravitational waves of very massive BHs has challenged our understanding of stellar evolution in massive stars, moving the focus to high-density environments like star clusters, where merger cascades are most likely to happen. In this context, a systematic search for stellar mass BHs in star clusters would be crucial to add important pieces of information in this complicated puzzle. Exploiting the technique developed by Giesers et al. 2018, 2019, we have recently started a large spectroscopic campaign with MUSE, to search for these objects in clusters of different ages. For two very young clusters in the Large Magellanic Clouds (NGC 1850, ~100Myr and NGC1846, ~1.5Gyr) we have recently secured ~15 epochs of observations spanning almost 2 years. First results show that a fair amount of stars in the clusters are in binary systems, with some of them showing evidence of orbit around BHs. I will spend some time discussing the first BH directly detected in NGC 1850, which is in a binary system with a B main sequence star. The simultaneous modelling of both radial velocity and OGLE light curves allowed us to derive the main physical properties of the system, as well as a first BH mass measurement. Such a detection is very important for clusters as young as 100 Myr, as this is the first step in constructing the initial mass function of BHs, which represents a long standing open question in astrophysics. We are trying something new this year with leaving the Zoom call open after the formal hour of the seminar is up to allow the speaker, if they wish, to chat informally with anyone who is interested. Thanks Chris and Tine Christopher Usher is inviting you to a scheduled Zoom meeting. Topic: Christopher Usher's Zoom Meeting Time: Sep 10, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/63399256477?pwd=U2RPNzY1Ry8wNFU4blFRYWZQeEVYZz09 Meeting ID: 633 9925 6477 Passcode: niChInat -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Sep 10 09:53:43 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 10 Sep 2021 09:53:43 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - September 10th Sara Saracino In-Reply-To: <97cf33af-a1d2-f2f2-8436-1fafbff6625b@astro.su.se> References: <97cf33af-a1d2-f2f2-8436-1fafbff6625b@astro.su.se> Message-ID: Reminder - Sara's seminar in 35 minutes! Thanks Chris On 06/09/2021 12:08, Chris Usher wrote: > > Hello > > On Friday the 10th we have the second astronomy seminar of the year > with Sara Saracino (Liverpool John Moores University) speaking via > Zoom at 10:30. > > *Stellar-mass black holes in young star clusters: exciting news* > > Black holes (BHs) are among the most mysterious and elusive objects in > the Universe. The recent discovery through gravitational waves of very > massive BHs has challenged our understanding of stellar evolution in > massive stars, moving the focus to high-density environments like star > clusters, where merger cascades are most likely to happen. In this > context, a systematic search for stellar mass BHs in star clusters > would be crucial to add important pieces of information in this > complicated puzzle. > > Exploiting the technique developed by Giesers et al. 2018, 2019, we > have recently started a large spectroscopic campaign with MUSE, to > search for these objects in clusters of different ages. For two very > young clusters in the Large Magellanic Clouds (NGC 1850, ~100Myr and > NGC1846, ~1.5Gyr) we have recently secured ~15 epochs of observations > spanning almost 2 years. First results show that a fair amount of > stars in the clusters are in binary systems, with some of them showing > evidence of orbit around BHs. > > I will spend some time discussing the first BH directly detected in > NGC 1850, which is in a binary system with a B main sequence star. The > simultaneous modelling of both radial velocity and OGLE light curves > allowed us to derive the main physical properties of the system, as > well as a first BH mass measurement. > > Such a detection is very important for clusters as young as 100 Myr, > as this is the first step in constructing the initial mass function of > BHs, which represents a long standing open question in astrophysics. > > We are trying something new this year with leaving the Zoom call open > after the formal hour of the seminar is up to allow the speaker, if > they wish, to chat informally with anyone who is interested. > > Thanks > > Chris and Tine > > Christopher Usher is inviting you to a scheduled Zoom meeting. > > Topic: Christopher Usher's Zoom Meeting > Time: Sep 10, 2021 10:30 AM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/63399256477?pwd=U2RPNzY1Ry8wNFU4blFRYWZQeEVYZz09 > > > Meeting ID: 633 9925 6477 > Passcode: niChInat > > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Sep 13 11:11:16 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 13 Sep 2021 11:11:16 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - September 17th Nushkia Chamba Message-ID: Hello On Friday the 17h we have the third astronomy seminar of the year with our own Nushkia Chamba (Stockholm University) speaking via Zoom at 10:30. *Unveiling the outskirts of galaxies using deep imaging * The traditional measurement of the size of galaxies, the effective radius, is a relic of the epoch when shallow imaging was unable to capture the full extension of astronomical sources. However, current deep imaging surveys have revolutionised our view of galaxies and the characteristics of their faint outskirts, allowing us to regard critically our own conventions. From this perspective, it is time to move from a size definition based on the light concentration of galaxies, the effective radius, to a definition that intuitively captures the concept of the size of galaxies, such as its edge or boundary. In this talk, a physically motivated definition for the size of a galaxy based on the gas density threshold value for star formation in galaxies is studied. Remarkably, the new size definition not only captures what the human visual system identifies as the edge of a galaxy, but also dramatically decreases the scatter in the stellar mass–size relation by more than a factor of two. Compared to other size measures, the new parameter is unique in that it also unifies galaxies spanning five orders of magnitude in stellar mass on a single mass–size relationship. To place this discovery in the context of galaxy formation and evolution, its application is discussed on the understanding of the origin of discs and the nature of ultra-diffuse galaxies. We are trying something new this year with leaving the Zoom call open after the formal hour of the seminar is up to allow the speaker, if they wish, to chat informally with anyone who is interested. Thanks Chris and Tine Christopher Usher is inviting you to a scheduled Zoom meeting. Topic: Astronomy Department Seminar - Nushkia Chamba Time: Sep 17, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/68003268702?pwd=Q085dHZrT0Y0djZHelZNL3RVb2x0Zz09 Meeting ID: 680 0326 8702 Passcode: eRmiTeXA One tap mobile 46844682488,,68003268702 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Sep 17 09:54:16 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 17 Sep 2021 09:54:16 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - September 17th Nushkia Chamba In-Reply-To: References: Message-ID: Reminder of Nushkia's seminar in ~35 min On 13/09/2021 11:11, Chris Usher wrote: > > Hello > > On Friday the 17h we have the third astronomy seminar of the year with > our own Nushkia Chamba (Stockholm University) speaking via Zoom at 10:30. > > *Unveiling the outskirts of galaxies using deep imaging * > > The traditional measurement of the size of galaxies, the effective > radius, is a relic of the epoch when shallow imaging was unable to > capture the full extension of astronomical sources. However, current > deep imaging surveys have revolutionised our view of galaxies and the > characteristics of their faint outskirts, allowing us to regard > critically our own conventions. From this perspective, it is time to > move from a size definition based on the light concentration of > galaxies, the effective radius, to a definition that intuitively > captures the concept of the size of galaxies, such as its edge or > boundary. In this talk, a physically motivated definition for the size > of a galaxy based on the gas density threshold value for star > formation in galaxies is studied. Remarkably, the new size definition > not only captures what the human visual system identifies as the edge > of a galaxy, but also dramatically decreases the scatter in the > stellar mass–size relation by more than a factor of two. Compared to > other size measures, the new parameter is unique in that it also > unifies galaxies spanning five orders of magnitude in stellar mass on > a single mass–size relationship. To place this discovery in the > context of galaxy formation and evolution, its application is > discussed on the understanding of the origin of discs and the nature > of ultra-diffuse galaxies. > > We are trying something new this year with leaving the Zoom call open > after the formal hour of the seminar is up to allow the speaker, if > they wish, to chat informally with anyone who is interested. > > Thanks > > Chris and Tine > > Christopher Usher is inviting you to a scheduled Zoom meeting. > > Topic: Astronomy Department Seminar - Nushkia Chamba > Time: Sep 17, 2021 10:30 AM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/68003268702?pwd=Q085dHZrT0Y0djZHelZNL3RVb2x0Zz09 > > > Meeting ID: 680 0326 8702 > Passcode: eRmiTeXA > One tap mobile > 46844682488,,68003268702 > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Sep 20 11:37:48 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 20 Sep 2021 11:37:48 +0200 Subject: [Astronomy seminar] No Astronomy Seminar This Week Message-ID: No astronomy seminar this week due to Forskarfredag Thanks Chris and Tine From seminars-announce.astro-at-su.se at lists.su.se Mon Sep 20 15:24:58 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 20 Sep 2021 15:24:58 +0200 Subject: [Astronomy seminar] Licentiate seminar: Alexandra Le Reste, Sept 23 Message-ID: All, It is a pleasure to invite you to the Licentiate thesis defense of Alexandra Le Reste, this coming Thursday. That is 23 Sept, and the presentation will begin at 10.00. The thesis is entitled: "HI observations of Lya-emitting galaxies" Due to the current situation, the seminar will be held on zoom, at the following link: https://stockholmuniversity.zoom.us/j/65603560239 You can find a copy of the thesis at: https://stockholmuniversity.box.com/s/jmn5jjn7nvcpxevjnbu3y1q9d3i9sghg Best wishes, Matt -- Matthew Hayes Stockholm University email: matthew at astro.su.se Department of Astronomy & tel: +46 (0)8 5537 8521 Oskar Klein Centre fax: +46 (0)8 5537 8510 AlbaNova University Centre inst: www.astro.su.se SE-106 91 Stockholm personal: www.xayes.org/pub/ Sweden skype: matthewhayes From seminars-announce.astro-at-su.se at lists.su.se Mon Sep 27 10:43:50 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 27 Sep 2021 10:43:50 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - October 1st Daichi Tsuna Message-ID: Hello On Friday October the 1st we will have the four astronomy seminar of the year with Daichi Tsuna (University of Tokyo) speaking via Zoom at 14:00. Please note the special time. *Multi-wavelength Emissions from Supernovae with Circumstellar Interaction* Recent transient observations find that a supernova is often surrounded by a dense circumstellar matter (CSM), presumably erupted by the progenitor star just before its death. The collision of the supernova ejecta with the CSM create shocks, which can power not only optical emission but also emissions in other wavelengths. In this seminar I will talk about our recent theoretical efforts to characterize the multi-wavelength view of supernovae involving CSM interaction. We are trying something new this year with leaving the Zoom call open after the formal hour of the seminar is up to allow the speaker, if they wish, to chat informally with anyone who is interested. Thanks Chris and Tine Christopher Usher is inviting you to a scheduled Zoom meeting. Topic: Astronomy Department Seminar - Daichi Tsuna Time: Oct 1, 2021 02:00 PM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/61237729554?pwd=cXdGWWR1VkF6OG5IYmJEWmlOLys3UT09 Meeting ID: 612 3772 9554 Passcode: rSITICen -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Oct 1 09:54:02 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 1 Oct 2021 09:54:02 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - October 1st Daichi Tsuna In-Reply-To: <3d4119c8-fc04-5a14-4ce1-e40cef6fb798@astro.su.se> References: <3d4119c8-fc04-5a14-4ce1-e40cef6fb798@astro.su.se> Message-ID: Reminder, this week's seminar is this afternoon at 14:00 C On 27/09/2021 10:43, Chris Usher wrote: > > Hello > > On Friday October the 1st we will have the four astronomy seminar of > the year with Daichi Tsuna (University of Tokyo) speaking via Zoom at > 14:00. Please note the special time. > > *Multi-wavelength Emissions from Supernovae with Circumstellar > Interaction* > > Recent transient observations find that a supernova is often > surrounded by a dense circumstellar matter (CSM), presumably erupted > by the progenitor star just before its death. The collision of the > supernova ejecta with the CSM create shocks, which can power not only > optical emission but also emissions in other wavelengths. In this > seminar I will talk about our recent theoretical efforts to > characterize the multi-wavelength view of supernovae involving CSM > interaction. > > We are trying something new this year with leaving the Zoom call open > after the formal hour of the seminar is up to allow the speaker, if > they wish, to chat informally with anyone who is interested. > > Thanks > > Chris and Tine > > Christopher Usher is inviting you to a scheduled Zoom meeting. > > Topic: Astronomy Department Seminar - Daichi Tsuna > Time: Oct 1, 2021 02:00 PM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/61237729554?pwd=cXdGWWR1VkF6OG5IYmJEWmlOLys3UT09 > > > Meeting ID: 612 3772 9554 > Passcode: rSITICen > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Oct 1 13:51:59 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 1 Oct 2021 13:51:59 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - October 1st Daichi Tsuna In-Reply-To: <3d4119c8-fc04-5a14-4ce1-e40cef6fb798@astro.su.se> References: <3d4119c8-fc04-5a14-4ce1-e40cef6fb798@astro.su.se> Message-ID: In 8 min On 27/09/2021 10:43, Chris Usher wrote: > > Hello > > On Friday October the 1st we will have the four astronomy seminar of > the year with Daichi Tsuna (University of Tokyo) speaking via Zoom at > 14:00. Please note the special time. > > *Multi-wavelength Emissions from Supernovae with Circumstellar > Interaction* > > Recent transient observations find that a supernova is often > surrounded by a dense circumstellar matter (CSM), presumably erupted > by the progenitor star just before its death. The collision of the > supernova ejecta with the CSM create shocks, which can power not only > optical emission but also emissions in other wavelengths. In this > seminar I will talk about our recent theoretical efforts to > characterize the multi-wavelength view of supernovae involving CSM > interaction. > > We are trying something new this year with leaving the Zoom call open > after the formal hour of the seminar is up to allow the speaker, if > they wish, to chat informally with anyone who is interested. > > Thanks > > Chris and Tine > > Christopher Usher is inviting you to a scheduled Zoom meeting. > > Topic: Astronomy Department Seminar - Daichi Tsuna > Time: Oct 1, 2021 02:00 PM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/61237729554?pwd=cXdGWWR1VkF6OG5IYmJEWmlOLys3UT09 > > > Meeting ID: 612 3772 9554 > Passcode: rSITICen > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Oct 4 16:17:54 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 4 Oct 2021 14:17:54 +0000 Subject: [Astronomy seminar] Astronomy Department Seminar - October 8th Anke Arentsen Message-ID: Dear all, on Friday the 8th of October we will have an Astronomy seminar with Anke Arentsen from The University of Strasbourg speaking remotely via Zoom at 10:30. We also leave the Zoom session open after the questions, so that interested participants can stay and chat with the speaker in an informal way. Title: Galactic Archaeology with the oldest stars in the Milky Way Abstract: The most metal-poor stars we find in the Milky Way today were born in pristine environments in the early Universe — these stars are expected to be extremely old. They can teach us about the First Stars and about the early formation and evolution of our Galaxy. In this talk I will focus on two groups of ancient stars: very metal-poor stars with exceptionally high carbon abundances (CEMP stars), which are probes of the nucleosynthesis in the First Stars and binary interactions, and the most metal-poor stars in the inner regions of the Milky Way. The fraction of metal-poor stars which are very old is expected to be very high in the Galactic bulge region. However, searching for metal-poor stars there faces many challenges, hence much is unknown about the properties of the metal-poor inner Galaxy. I will introduce the Pristine Inner Galaxy Survey (PIGS) which has reached unprecedented efficiency in finding very metal-poor stars in the Galactic bulge region. I will present recent PIGS results on the chemistry and the kinematics of metal-poor inner Galaxy stars, and discuss what they can teach us about this ancient component of the Milky Way. Tine Libbrecht is inviting you to a scheduled Zoom meeting. Topic: Friday Seminar Time: Oct 8, 2021 10:15 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/4181744735?pwd=WlcrNnZpUmVva05seHA4d1ZOUitBUT09 Meeting ID: 418 174 4735 Passcode: wevRIEA38a -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Thu Oct 7 12:53:49 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Thu, 7 Oct 2021 12:53:49 +0200 Subject: [Astronomy seminar] [Cancelled] Astronomy Department Seminar - October 8th Anke Arentsen In-Reply-To: References: Message-ID: Dear all, Tomorrows seminar has been cancelled. We are working on rescheduling the talk for the spring semester. Best regards, Tine > On 404 Oct 2021, at 16:17, Tine Libbrecht wrote: > > Dear all, > > on Friday the 8th of October we will have an Astronomy seminar with Anke Arentsen from The University of Strasbourg speaking remotely via Zoom at 10:30. > > We also leave the Zoom session open after the questions, so that interested participants can stay and chat with the speaker in an informal way. > > Title: Galactic Archaeology with the oldest stars in the Milky Way > > Abstract: The most metal-poor stars we find in the Milky Way today were born in pristine environments in the early Universe — these stars are expected to be extremely old. They can teach us about the First Stars and about the early formation and evolution of our Galaxy. In this talk I will focus on two groups of ancient stars: very metal-poor stars with exceptionally high carbon abundances (CEMP stars), which are probes of the nucleosynthesis in the First Stars and binary interactions, and the most metal-poor stars in the inner regions of the Milky Way. The fraction of metal-poor stars which are very old is expected to be very high in the Galactic bulge region. However, searching for metal-poor stars there faces many challenges, hence much is unknown about the properties of the metal-poor inner Galaxy. I will introduce the Pristine Inner Galaxy Survey (PIGS) which has reached unprecedented efficiency in finding very metal-poor stars in the Galactic bulge region. I will present recent PIGS results on the chemistry and the kinematics of metal-poor inner Galaxy stars, and discuss what they can teach us about this ancient component of the Milky Way. > > Tine Libbrecht is inviting you to a scheduled Zoom meeting. > > Topic: Friday Seminar > Time: Oct 8, 2021 10:15 AM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/4181744735?pwd=WlcrNnZpUmVva05seHA4d1ZOUitBUT09 > > Meeting ID: 418 174 4735 > Passcode: wevRIEA38a -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Tue Oct 12 14:08:41 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 12 Oct 2021 12:08:41 +0000 Subject: [Astronomy seminar] Astronomy Department Seminar - October 15th Carlos Jose Diaz Baso on Deep Learning Message-ID: Dear all, on Friday the 15th of October we will have an Astronomy seminar with our very own Carlos Jose Diaz Baso via Zoom at 10h30. We also leave the Zoom session open after the questions, so that interested participants can stay and chat with the speaker in an informal way. Title: Deep Learning in Solar Physics During the last decade, deep learning has emerged as a powerful tool to analyze the relevant information from observations. By exploiting some symmetries and patterns they can be optimized to perform faster and sometimes better than conventional methods. In this talk, I will present some examples of how we have successfully applied deep learning to several problems in Solar Physics and highlight some results related to image deconvolution, parameter inference, and noise reduction in observational data. Tine Libbrecht is inviting you to a scheduled Zoom meeting. Topic: Friday Astronomy Seminar Time: Oct 15, 2021 10:30 PM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/61958796856?pwd=RXQ5dXBXYnlKM0NtR3ZQRGxRUTF5dz09 Meeting ID: 619 5879 6856 Passcode: ave0jvs -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Tue Oct 19 10:19:16 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 19 Oct 2021 10:19:16 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - October 22nd Azadeh Fattahi Message-ID: Hello On Friday the 22nd we have the next astronomy Seminar with Azadeh Fattahi (Durham University) speaking at 10:30 via Zoom. *The build-up of the Milky Way's halo* Abstract: The hierarchical nature of galaxy formation in the standard model of cosmology (LCDM) predicts a diffuse stellar halo component around Milky Way-mass galaxies, formed from the accretion and disruption of dwarf galaxies. Using cosmological hydrodynamical simulations, I will discuss the radial build up of stellar halos from the accreted dwarfs and will connect these results with recent findings from the Gaia mission related to the major event in the formation history of the Milky Way (Gaia-Enceladus-Sausage). I will discuss whether this event is unusual and whether it has any implications for dark matter distribution and dark matter direct detection experiments. We are trying something new this year with leaving the Zoom call open after the formal hour of the seminar is up to allow the speaker, if they wish, to chat informally with anyone who is interested. Thanks Chris and Tine Christopher Usher is inviting you to a scheduled Zoom meeting. Topic: Astronomy Department Seminar - Azadeh Fattahi Time: Oct 22, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/62964465990?pwd=Sm9FVGNscVhySjhHSWlIMjJxWElnUT09 Meeting ID: 629 6446 5990 Passcode: YfV8V5PGQu -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Oct 22 10:20:27 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 22 Oct 2021 10:20:27 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - October 22nd Azadeh Fattahi In-Reply-To: <77fa9141-2862-53ba-ce2b-90734a35ffa1@astro.su.se> References: <77fa9141-2862-53ba-ce2b-90734a35ffa1@astro.su.se> Message-ID: Reminder - in 10 min C On 19/10/2021 10:19, Chris Usher wrote: > > Hello > > On Friday the 22nd we have the next astronomy Seminar with Azadeh > Fattahi (Durham University) speaking at 10:30 via Zoom. > > *The build-up of the Milky Way's halo* > > > Abstract: The hierarchical nature of galaxy formation in the standard > model of cosmology (LCDM) predicts a diffuse stellar halo component > around Milky Way-mass galaxies, formed from the accretion and > disruption of dwarf galaxies. Using cosmological hydrodynamical > simulations, I will discuss the radial build up of stellar halos from > the accreted dwarfs and will connect these results with recent > findings from the Gaia mission related to the major event in the > formation history of the Milky Way (Gaia-Enceladus-Sausage). I will > discuss whether this event is unusual and whether it has any > implications for dark matter distribution and dark matter direct > detection experiments. > > We are trying something new this year with leaving the Zoom call open > after the formal hour of the seminar is up to allow the speaker, if > they wish, to chat informally with anyone who is interested. > > Thanks > > Chris and Tine > > Christopher Usher is inviting you to a scheduled Zoom meeting. > > Topic: Astronomy Department Seminar - Azadeh Fattahi > Time: Oct 22, 2021 10:30 AM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/62964465990?pwd=Sm9FVGNscVhySjhHSWlIMjJxWElnUT09 > > > Meeting ID: 629 6446 5990 > Passcode: YfV8V5PGQu > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Oct 22 12:11:05 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 22 Oct 2021 12:11:05 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - October 22nd Azadeh Fattahi In-Reply-To: <77fa9141-2862-53ba-ce2b-90734a35ffa1@astro.su.se> References: <77fa9141-2862-53ba-ce2b-90734a35ffa1@astro.su.se> Message-ID: For those who missed Azi's talk due to Astronomdagarna, here is a recording of the talk: https://stockholmuniversity.box.com/s/xzd19nfrgbz151cpnmr86a0ybaxvukc4 On 19/10/2021 10:19, Chris Usher wrote: > > Hello > > On Friday the 22nd we have the next astronomy Seminar with Azadeh > Fattahi (Durham University) speaking at 10:30 via Zoom. > > *The build-up of the Milky Way's halo* > > > Abstract: The hierarchical nature of galaxy formation in the standard > model of cosmology (LCDM) predicts a diffuse stellar halo component > around Milky Way-mass galaxies, formed from the accretion and > disruption of dwarf galaxies. Using cosmological hydrodynamical > simulations, I will discuss the radial build up of stellar halos from > the accreted dwarfs and will connect these results with recent > findings from the Gaia mission related to the major event in the > formation history of the Milky Way (Gaia-Enceladus-Sausage). I will > discuss whether this event is unusual and whether it has any > implications for dark matter distribution and dark matter direct > detection experiments. > > We are trying something new this year with leaving the Zoom call open > after the formal hour of the seminar is up to allow the speaker, if > they wish, to chat informally with anyone who is interested. > > Thanks > > Chris and Tine > > Christopher Usher is inviting you to a scheduled Zoom meeting. > > Topic: Astronomy Department Seminar - Azadeh Fattahi > Time: Oct 22, 2021 10:30 AM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/62964465990?pwd=Sm9FVGNscVhySjhHSWlIMjJxWElnUT09 > > > Meeting ID: 629 6446 5990 > Passcode: YfV8V5PGQu > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Oct 25 14:08:28 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 25 Oct 2021 14:08:28 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - October 29th Lorenza Della Bruna Message-ID: Hello On Friday the 29th we have the next astronomy Seminar with Lorenza Della Bruna (Stockholm University) speaking at 10:30 via Zoom. *Stellar feedback in nearby galaxies at key physical scales* Stars are a source of radiative and mechanical feedback in the ISM that is essential for the self-regulation of star formation in galaxies. Stellar feedback originates from young, massive stars, and shapes the morphology of the star forming region, but proves to be effective up to galactic-wide scales. I will present the results of my PhD work on two nearby galaxies, NGC7793 and M83, studying the star-forming regions at key spatial scales that allow us to probe the interface between the sources of feedback (stars and clusters, i.e. a few parsec scales) and their immediate surroundings (~10 pc) to kiloparsec scale dynamics. VLT/MUSE data tracing the ionised gas are complemented with HST and ALMA observations of the young stars and molecular gas, to provide a full picture of the star formation cycle. We are trying something new this year with leaving the Zoom call open after the formal hour of the seminar is up to allow the speaker, if they wish, to chat informally with anyone who is interested. Thanks Chris and Tine Christopher Usher is inviting you to a scheduled Zoom meeting. Topic: Christopher Usher's Zoom Meeting Time: Oct 29, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/64677670116?pwd=UXpIZ3N0YzQyS1ZMYzJtL3J1RUkxUT09 Meeting ID: 646 7767 0116 Passcode: tN8RP6y7UM -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Oct 29 09:54:00 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 29 Oct 2021 09:54:00 +0200 Subject: [Astronomy seminar] Astronomy Department Seminar - October 29th Lorenza Della Bruna In-Reply-To: References: Message-ID: Reminder, Lorenza's seminar is in 35 min On 25/10/2021 14:08, Chris Usher wrote: > > Hello > > On Friday the 29th we have the next astronomy Seminar with Lorenza > Della Bruna (Stockholm University) speaking at 10:30 via Zoom. > > *Stellar feedback in nearby galaxies at key physical scales* > > Stars are a source of radiative and mechanical feedback in the ISM > that is essential for the self-regulation of star formation in > galaxies. Stellar feedback originates from young, massive stars, and > shapes the morphology of the star forming region, but proves to be > effective up to galactic-wide scales. I will present the results of my > PhD work on two nearby galaxies, NGC7793 and M83, studying the > star-forming regions at key spatial scales that allow us to probe the > interface between the sources of feedback (stars and clusters, i.e. a > few parsec scales) and their immediate surroundings (~10 pc) to > kiloparsec scale dynamics. VLT/MUSE data tracing the ionised gas are > complemented with HST and ALMA observations of the young stars and > molecular gas, to provide a full picture of the star formation cycle. > > We are trying something new this year with leaving the Zoom call open > after the formal hour of the seminar is up to allow the speaker, if > they wish, to chat informally with anyone who is interested. > > Thanks > > Chris and Tine > > Christopher Usher is inviting you to a scheduled Zoom meeting. > > Topic: Christopher Usher's Zoom Meeting > Time: Oct 29, 2021 10:30 AM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/64677670116?pwd=UXpIZ3N0YzQyS1ZMYzJtL3J1RUkxUT09 > > > Meeting ID: 646 7767 0116 > Passcode: tN8RP6y7UM > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Nov 1 11:25:14 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 1 Nov 2021 11:25:14 +0100 Subject: [Astronomy seminar] No Astronomy Seminar this Week Message-ID: Hello No seminar this week on account of All Saints Eve. Seminars will return next week with Ana Grinon Marin speaking on the 12th. Thank you Chris and Tine From seminars-announce.astro-at-su.se at lists.su.se Mon Nov 8 11:50:50 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 8 Nov 2021 10:50:50 +0000 Subject: [Astronomy seminar] Astronomy Department Seminar - 12th of November Ana Belen Grinon Marin Message-ID: Hej all, On Friday the 12th of November, we have the next astronomy seminar with Ana Belen Grinon Marin (University of Oslo) speaking at 10:30 via Zoom: Learning about sunspot magnetism and evolution through light-bridges The closeness of the Sun allows us the most detailed analysis of the various physical phenomena that take place in stars (solar-like at least). One of the most intriguing aspects of the Sun's behaviour is its magnetism, the interaction of the magnetic field with the solar plasma, as well as its role in the connectivity throughout the heliosphere. The presence of magnetic fields reveals itself in different structures, one of which are the sunspots. In recent years, our understanding of the formation and evolution of sunspots has improved thanks to, among other things, the advent of spectropolarimetric observations and/or high temporal, spatial, and/or spectral resolution, but there are still many questions to be answered. One important feature of some sunspots is the presence of light bridges. They play an important role in the evolution of those sunspots that develop them. They are irregular, bright, and elongated structures that are seen in umbra during the formation and/or decay of sunspots or pores. In this talk, I will present the results of long-term evolution of different atmospheric parameters of three light bridges formed in the same host sunspot by different mechanisms. Best, Chris and Tine Tine Libbrecht is inviting you to a scheduled Zoom meeting. Topic: Learning about sunspot magnetism and evolution through light-bridges Time: Nov 12, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/66563404256?pwd=NytETjUzUTJxKzN1ckp6OHIyNy9DZz09 Meeting ID: 665 6340 4256 Passcode: 035087 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Nov 12 08:35:38 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 12 Nov 2021 08:35:38 +0100 Subject: [Astronomy seminar] Reminder at 10:30 - Astronomy Department Seminar - 12th of November Ana Belen Grinon Marin In-Reply-To: References: Message-ID: Today at 10:30 via Zoom, link below > On 458 Nov 2021, at 11:50, Tine Libbrecht wrote: > > Hej all, > > On Friday the 12th of November, we have the next astronomy seminar with Ana Belen Grinon Marin (University of Oslo) speaking at 10:30 via Zoom: > > Learning about sunspot magnetism and evolution through light-bridges > > The closeness of the Sun allows us the most detailed analysis of the various physical phenomena that take place in stars (solar-like at least). One of the most intriguing aspects of the Sun's behaviour is its magnetism, the interaction of the magnetic field with the solar plasma, as well as its role in the connectivity throughout the heliosphere. The presence of magnetic fields reveals itself in different structures, one of which are the sunspots. > > In recent years, our understanding of the formation and evolution of sunspots has improved thanks to, among other things, the advent of spectropolarimetric observations and/or high temporal, spatial, and/or spectral resolution, but there are still many questions to be answered. One important feature of some sunspots is the presence of light bridges. They play an important role in the evolution of those sunspots that develop them. They are irregular, bright, and elongated structures that are seen in umbra during the formation and/or decay of sunspots or pores. > > In this talk, I will present the results of long-term evolution of different atmospheric parameters of three light bridges formed in the same host sunspot by different mechanisms. > > Best, > Chris and Tine > > > Tine Libbrecht is inviting you to a scheduled Zoom meeting. > > Topic: Learning about sunspot magnetism and evolution through light-bridges > Time: Nov 12, 2021 10:30 AM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/66563404256?pwd=NytETjUzUTJxKzN1ckp6OHIyNy9DZz09 > > Meeting ID: 665 6340 4256 > Passcode: 035087 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Nov 15 13:17:33 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 15 Nov 2021 13:17:33 +0100 Subject: [Astronomy seminar] Astronomy Department seminar - Friday 19th of November David Aguado Message-ID: Hej all, On Friday the 19th of November, we have the next astronomy seminar with Dr. David Aguado (University of Florence) speaking at 10:30 via Zoom. Learning from the chemistry of the first stars The most metal-poor stars in the Milky Way and its satellites carry precious information about the origin and evolution of the Local group. Those ancient stars were made from the primordial material formed during Big-Bang Nucleosynthesis and polluted by very few supernovae. Their chemical signatures are key to understanding the formation of the halo, the mass distribution of the first stars, and the supernova yields. Now, thanks to the outcomes of the Gaia mission we can trace back the complex assembly of the Milky Way and interpret the information codified in the stellar atmospheres of these invaluable fossil records from the early Galaxy. We will summarize some of the aspects we could try to understand with high-resolution spectroscopy of metal-poor stars. Best, Chris and Tine Tine Libbrecht is inviting you to a scheduled Zoom meeting. Topic: Astro seminar: David Aguado Time: Nov 19, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/63828183161?pwd=N0U1bkNocWJKdFhqYjZpNkFSK0g1dz09 Meeting ID: 638 2818 3161 Passcode: 438695 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Nov 19 09:39:53 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 19 Nov 2021 09:39:53 +0100 Subject: [Astronomy seminar] Reminder: Astronomy Department seminar - Friday 19th of November David Aguado In-Reply-To: <1F6F1036-F953-4CF9-B9F1-5736DE05919B@astro.su.se> References: <1F6F1036-F953-4CF9-B9F1-5736DE05919B@astro.su.se> Message-ID: Today at 10:30 via Zoom. > On 4615 Nov 2021, at 13:17, Tine Libbrecht wrote: > > Hej all, > > On Friday the 19th of November, we have the next astronomy seminar with Dr. David Aguado (University of Florence) speaking at 10:30 via Zoom. > > Learning from the chemistry of the > first stars > > The most metal-poor stars in the Milky Way and > its satellites carry precious information about the origin and evolution of the Local group. Those ancient stars were made from the primordial material formed during Big-Bang Nucleosynthesis and polluted by very few supernovae. Their chemical signatures are > key to understanding the formation of the halo, the mass distribution of the first stars, and the supernova yields. Now, thanks to the outcomes of the Gaia mission we can trace back the complex assembly of the Milky Way and interpret the information codified > in the stellar atmospheres of these invaluable fossil records from the early Galaxy. We will summarize some of the aspects we could try to understand with high-resolution spectroscopy of metal-poor stars. > > > Best, Chris and Tine > > > Tine Libbrecht is inviting you to a scheduled Zoom meeting. > > Topic: Astro seminar: David Aguado > Time: Nov 19, 2021 10:30 AM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/63828183161?pwd=N0U1bkNocWJKdFhqYjZpNkFSK0g1dz09 > > Meeting ID: 638 2818 3161 > Passcode: 438695 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Nov 19 14:56:13 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 19 Nov 2021 14:56:13 +0100 Subject: [Astronomy seminar] Link to Seminar - Dr. David Aguado Message-ID: Hej alla, Today’s seminar with Dr. David Aguado on “Learning from the chemistry of the first stars" was recorded. The link is provided here: https://stockholmuniversity.box.com/s/du4toym9a7hievg4dye7o465bv20r5j6 Best regards, Tine -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Nov 22 13:33:00 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 22 Nov 2021 13:33:00 +0100 Subject: [Astronomy seminar] Astronomy Department Seminar - November 26th Jeff Cooke Message-ID: Hello On Friday the 26th we have the next astronomy seminar with Jeff Cooke (Swinburne University of Technology) at 10:30 via Zoom. *The Deeper, Wider, Faster program and the Keck Wide-Field Imager* In this talk, I will first discuss the Deeper, Wider, Faster (DWF) program, an innovative all-wavelength program chasing the fastest bursts in the Universe. Fast transients with millisecond-to-hours durations are observed and predicted at all wavelengths, such as fast radio bursts (FRBs), supernova shock breakouts, GRBs and their afterglows, X-ray bursts, Type Ia supernova/companion star collisions, kilonovae, blitzars, and other exotic events, with most classes having no detections or a few serendipitous observations to date. DWF coordinates over 80 radio through gamma-ray telescopes and particle detectors located on every continent and in space to simultaneously gather deep, wide-field, fast-cadenced observations before, during, and after the fast events before they quickly fade. DWF performs real-time (seconds) data processing and transient identification to trigger rapid-response spectroscopy and imaging on program-coordinated 8m-class optical, radio, and high-energy telescopes and DWF coordinates later-time observations, as some fast transients are associated with longer-duration events (e.g., supernova shock breakouts). I will conclude by discussing the proposed Keck Wide-Field Imager (KWFI), a UV-sensitive optical (3000-10000A) imager that will be the most powerful wide-field imager in the world for the foreseeable future. KWFI will progress fast transient science, as well as nearly every other area of astronomy, from the solar system to the high redshift Universe, including radio, high-energy, and gravitational wave research. I will describe how KWFI, with its extreme depths and blue sensitivities (e.g., m ~ 28 in ~1-2 hrs) over wide fields, will enable science that cannot be done on any other telescope, including future 30m-class telescopes, and will provide deep photometry essential for upcoming facilities, such as the E-ELT, wide-field 10m-class spectrographs, gravitational wave detectors, and the JWST, Roman, and Euclid space missions. We are trying something new this year with leaving the Zoom call open after the formal hour of the seminar is up to allow the speaker, if they wish, to chat informally with anyone who is interested. Thanks Chris and Tine Christopher Usher is inviting you to a scheduled Zoom meeting. Topic: Astronomy Seminar - Jeff Cooke Time: Nov 26, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/63061726531?pwd=WWtYVVRwR3ZtZFhGR3Foa1pBWnE1QT09 Meeting ID: 630 6172 6531 Passcode: Ye29K5r85t -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Nov 26 09:58:19 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 26 Nov 2021 09:58:19 +0100 Subject: [Astronomy seminar] Astronomy Department Seminar - November 26th Jeff Cooke In-Reply-To: References: Message-ID: Reminder - Jeff's seminar is in half an hour. C On 22/11/2021 13:33, Chris Usher wrote: > > Hello > > On Friday the 26th we have the next astronomy seminar with Jeff Cooke > (Swinburne University of Technology) at 10:30 via Zoom. > > *The Deeper, Wider, Faster program and the Keck Wide-Field Imager* > > In this talk, I will first discuss the Deeper, Wider, Faster (DWF) > program, an innovative all-wavelength program chasing the fastest > bursts in the Universe. Fast transients with millisecond-to-hours > durations are observed and predicted at all wavelengths, such as fast > radio bursts (FRBs), supernova shock breakouts, GRBs and their > afterglows, X-ray bursts, Type Ia supernova/companion star collisions, > kilonovae, blitzars, and other exotic events, with most classes having > no detections or a few serendipitous observations to date. DWF > coordinates over 80 radio through gamma-ray telescopes and particle > detectors located on every continent and in space to simultaneously > gather deep, wide-field, fast-cadenced observations before, during, > and after the fast events before they quickly fade. DWF performs > real-time (seconds) data processing and transient identification to > trigger rapid-response spectroscopy and imaging on program-coordinated > 8m-class optical, radio, and high-energy telescopes and DWF > coordinates later-time observations, as some fast transients are > associated with longer-duration events (e.g., supernova shock > breakouts). I will conclude by discussing the proposed Keck Wide-Field > Imager (KWFI), a UV-sensitive optical (3000-10000A) imager that will > be the most powerful wide-field imager in the world for the > foreseeable future. KWFI will progress fast transient science, as well > as nearly every other area of astronomy, from the solar system to the > high redshift Universe, including radio, high-energy, and > gravitational wave research. I will describe how KWFI, with its > extreme depths and blue sensitivities (e.g., m ~ 28 in ~1-2 hrs) over > wide fields, will enable science that cannot be done on any other > telescope, including future 30m-class telescopes, and will provide > deep photometry essential for upcoming facilities, such as the E-ELT, > wide-field 10m-class spectrographs, gravitational wave detectors, and > the JWST, Roman, and Euclid space missions. > > We are trying something new this year with leaving the Zoom call open > after the formal hour of the seminar is up to allow the speaker, if > they wish, to chat informally with anyone who is interested. > > Thanks > > Chris and Tine > > Christopher Usher is inviting you to a scheduled Zoom meeting. > > Topic: Astronomy Seminar - Jeff Cooke > Time: Nov 26, 2021 10:30 AM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/63061726531?pwd=WWtYVVRwR3ZtZFhGR3Foa1pBWnE1QT09 > > > Meeting ID: 630 6172 6531 > Passcode: Ye29K5r85t > > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Nov 29 15:59:23 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 29 Nov 2021 15:59:23 +0100 Subject: [Astronomy seminar] Astronomy Department Seminar - December 3rd Eliot Ayache Message-ID: Hello On Friday the 3rd at 10:30 we have our next astronomy seminar with Eliot Ayache (Stockholm University) via Zoom. *The Numerics of Gamma-ray Burst Afterglows Across Scales* Gamma-ray burst (GRB) afterglows are riddled with multiscale processes in the spatial, temporal, and spectral domains. Accurately capturing the interplay between these processes, and their manifestations at short and long timescales, is the key to uncovering the nature and behavior of the associated progenitor and remnant. I will first focus on direct modeling and show how recent improvements in the treatment of the numerical dynamics, using moving meshes, allow us to correctly, numerically, simulate radiative cooling from non-thermal processes inside the jet. This finally allows for full broadband simulation of time-dependent synchrotron emission in relativistic transients. I will then present results showing how these simulations open the door to the study of complex dynamical behaviors with multiple emission sites (and the associated short-timescale light curve variability), as well as the investigation of the microphysical processes at play inside the jet in the trans-relativistic regime (and the associated late-time effects on the light curve). I will conclude by focusing on the inverse problem and present preliminary results on how state-of-the-art unsupervised machine leaning techniques can provide physical insight into the long-timescale behavior of GRB afterglows. We are trying something new this year with leaving the Zoom call open after the formal hour of the seminar is up to allow the speaker, if they wish, to chat informally with anyone who is interested. Thanks Chris and Tine Christopher Usher is inviting you to a scheduled Zoom meeting. Topic: Astronomy Department Seminar - Eliot Ayache Time: Dec 3, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/69591012819?pwd=dExIT1hCNjgxNVNZaktMRzBaOXNmUT09 Meeting ID: 695 9101 2819 Passcode: Mq46qc86Jc -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Dec 3 10:07:54 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 3 Dec 2021 10:07:54 +0100 Subject: [Astronomy seminar] Astronomy Department Seminar - December 3rd Eliot Ayache In-Reply-To: <1c4d9f66-1e5c-baf4-eb50-19e159f37568@astro.su.se> References: <1c4d9f66-1e5c-baf4-eb50-19e159f37568@astro.su.se> Message-ID: Reminder, Eliot is talking in 23 min C On 29/11/2021 15:59, Chris Usher wrote: > > Hello > > On Friday the 3rd at 10:30 we have our next astronomy seminar with > Eliot Ayache (Stockholm University) via Zoom. > > *The Numerics of Gamma-ray Burst Afterglows Across Scales* > > Gamma-ray burst (GRB) afterglows are riddled with multiscale processes > in the spatial, temporal, and spectral domains. Accurately capturing > the interplay between these processes, and their manifestations at > short and long timescales, is the key to uncovering the nature and > behavior of the associated progenitor and remnant. I will first focus > on direct modeling and show how recent improvements in the treatment > of the numerical dynamics, using moving meshes, allow us to > correctly, numerically, simulate radiative cooling from non-thermal > processes inside the jet. This finally allows for full broadband > simulation of time-dependent synchrotron emission in > relativistic transients. I will then present results showing how these > simulations open the door to the study of complex dynamical behaviors > with multiple emission sites (and the associated short-timescale light > curve variability), as well as the investigation of the microphysical > processes at play inside the jet in the trans-relativistic regime (and > the associated late-time effects on the light curve). I will > conclude by focusing on the inverse problem and present preliminary > results on how state-of-the-art unsupervised machine leaning > techniques can provide physical insight into the > long-timescale behavior of GRB afterglows. > > We are trying something new this year with leaving the Zoom call open > after the formal hour of the seminar is up to allow the speaker, if > they wish, to chat informally with anyone who is interested. > > Thanks > > Chris and Tine > > Christopher Usher is inviting you to a scheduled Zoom meeting. > > Topic: Astronomy Department Seminar - Eliot Ayache > Time: Dec 3, 2021 10:30 AM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/69591012819?pwd=dExIT1hCNjgxNVNZaktMRzBaOXNmUT09 > > > Meeting ID: 695 9101 2819 > Passcode: Mq46qc86Jc > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Dec 6 12:12:25 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 6 Dec 2021 12:12:25 +0100 Subject: [Astronomy seminar] =?utf-8?q?Astronomy_Department_Seminar_-_Dece?= =?utf-8?q?mber_10th_H=C3=A9lo=C3=AFse_Stevance?= Message-ID: On Friday the 10th at 10:30 we have our final astronomy seminar of the year with Héloïse Stevance (University of Auckland) via Zoom. *The Life Story of AT 2017gfo* Massive stars, and the menagerie of explosions resulting from their deaths, are indispensable to creating a Universe that can harbour life as we know it. Kilonovae are the explosions from the merger of neutron stars, which are themselves the compact remnants left from supernova events marking the death of massive stars. They are a known site for neutron-rich element creation in the Universe (such as gold), but the extent of their contribution is still debated. A crucial piece of the puzzle is understanding their ancestors and the life they led, but only one kilonova has been detected so far: AT 2017gfo. In this talk I will present how our binary stellar evolution models can help us reconstruct the life story of the progenitor system of this (so far) unprecedented event, and how we are preparing for future kilonovae observations that will come in 2022/2023. We are trying something new this year with leaving the Zoom call open after the formal hour of the seminar is up to allow the speaker, if they wish, to chat informally with anyone who is interested. I want to take a moment to thank my fellow seminar organiser, Tine Libbrecht, for her hard work this semester and to wish her good luck in her future endeavours. Carolina Robustini will be taking over from Tine in the new year. We will be continuing with Zoom only seminars in the New Year but hope that if conditions improve we will be able to have some hybrid seminars later in the spring. Thanks Chris and Tine Christopher Usher is inviting you to a scheduled Zoom meeting. Topic: Astronomy Department Seminar - Héloïse Stevance Time: Dec 10, 2021 10:30 AM Stockholm Join Zoom Meeting https://stockholmuniversity.zoom.us/j/65163353536?pwd=aGJONnVTZHo1UjhpU3lKU2h5aEJRZz09 Meeting ID: 651 6335 3536 Passcode: qC7R2hrkgg -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Dec 10 10:00:55 2021 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 10 Dec 2021 10:00:55 +0100 Subject: [Astronomy seminar] =?utf-8?q?Astronomy_Department_Seminar_-_Dec?= =?utf-8?q?ember_10th_H=C3=A9lo=C3=AFse_Stevance?= In-Reply-To: <9a2e1f5c-9fcc-e859-6c17-226f728d3ab7@astro.su.se> References: <9a2e1f5c-9fcc-e859-6c17-226f728d3ab7@astro.su.se> Message-ID: Reminder of Héloïse's talk in half an hour! C On 06/12/2021 12:12, Chris Usher wrote: > > On Friday the 10th at 10:30 we have our final astronomy seminar of the > year with Héloïse Stevance (University of Auckland) via Zoom. > > *The Life Story of AT 2017gfo* > > Massive stars, and the menagerie of explosions resulting from their > deaths, are indispensable to creating a Universe that can harbour life > as we know it. Kilonovae are the explosions from the merger of neutron > stars, which are themselves the compact remnants left from supernova > events marking the death of massive stars. They are a known site for > neutron-rich element creation in the Universe (such as gold), but the > extent of their contribution is still debated. A crucial piece of the > puzzle is understanding their ancestors and the life they led, but > only one kilonova has been detected so far: AT 2017gfo. In this talk I > will present how our binary stellar evolution models can help us > reconstruct the life story of the progenitor system of this (so far) > unprecedented event, and how we are preparing for future kilonovae > observations that will come in 2022/2023. > > We are trying something new this year with leaving the Zoom call open > after the formal hour of the seminar is up to allow the speaker, if > they wish, to chat informally with anyone who is interested. > > I want to take a moment to thank my fellow seminar organiser, Tine > Libbrecht, for her hard work this semester and to wish her good luck > in her future endeavours. Carolina Robustini will be taking over from > Tine in the new year. We will be continuing with Zoom only seminars in > the New Year but hope that if conditions improve we will be able to > have some hybrid seminars later in the spring. > > Thanks > > Chris and Tine > > Christopher Usher is inviting you to a scheduled Zoom meeting. > > Topic: Astronomy Department Seminar - Héloïse Stevance > Time: Dec 10, 2021 10:30 AM Stockholm > > Join Zoom Meeting > https://stockholmuniversity.zoom.us/j/65163353536?pwd=aGJONnVTZHo1UjhpU3lKU2h5aEJRZz09 > > > Meeting ID: 651 6335 3536 > Passcode: qC7R2hrkgg > > -------------- next part -------------- An HTML attachment was scrubbed... URL: