From haakon.andresen at astro.su.se Wed Jan 25 15:34:33 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Wed, 25 Jan 2023 14:34:33 +0000 Subject: [Okc-wp4] EO meetng 02/02/2023 in MEGA at 13:00 Message-ID: <4b93cebcc778461193d70cdbfe7658b8@astro.su.se> Dear Everyone, It is time to kick off this years EO meetings. Our first meeting of 2023 will take place next week, Thursday 2nd of February in MEGA at 13.00. Our speaker Michele Zanolin is an active member of the LVK burst grupe, the part of the Ligo-Virgo-Kagra collaboration that deals with burst like signals. Michele will be around for a few days, so anyone interested in talking to him let me know. Best, Haakon (on behalf of the EO meeting organizers) Title:Parameter estimation with Gravitational Waves from Core Collapse Supernovae Abstract: Parameter estimation and multimessenger astronomy with gravitational waves (GWs) from Compact Binary Coalescences are already a reality thanks to the recent observation runs of laser interferometers around the globe. For core collapse supernovae (CCSNe) we are still working on the foundations of the corresponding research program. In this talk I will review a series of recent methodological papers describing how the deterministic features of GWs from CCSNe could be evaluated, including in multimessenger schemes. The relevance for searches in future observational runs and interferometers will also be discussed. Time: Thursday 2nd of February, 13.00 Where: MEGA room, NORDITA. -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Thu Feb 2 11:03:17 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Thu, 2 Feb 2023 10:03:17 +0000 Subject: [Okc-wp4] EO meetng 02/02/2023 in MEGA at 13:00 In-Reply-To: <4b93cebcc778461193d70cdbfe7658b8@astro.su.se> References: <4b93cebcc778461193d70cdbfe7658b8@astro.su.se> Message-ID: Reminder of the meeting today. 13:00 in MEGA ________________________________ From: Okc-wp4-at-fysik.su.se on behalf of Haakon Andresen via Okc-wp4-at-fysik.su.se Sent: 25 January 2023 15:34:33 To: Okc-wp4 at fysik.su.se Subject: [Okc-wp4] EO meetng 02/02/2023 in MEGA at 13:00 Dear Everyone, It is time to kick off this years EO meetings. Our first meeting of 2023 will take place next week, Thursday 2nd of February in MEGA at 13.00. Our speaker Michele Zanolin is an active member of the LVK burst grupe, the part of the Ligo-Virgo-Kagra collaboration that deals with burst like signals. Michele will be around for a few days, so anyone interested in talking to him let me know. Best, Haakon (on behalf of the EO meeting organizers) Title:Parameter estimation with Gravitational Waves from Core Collapse Supernovae Abstract: Parameter estimation and multimessenger astronomy with gravitational waves (GWs) from Compact Binary Coalescences are already a reality thanks to the recent observation runs of laser interferometers around the globe. For core collapse supernovae (CCSNe) we are still working on the foundations of the corresponding research program. In this talk I will review a series of recent methodological papers describing how the deterministic features of GWs from CCSNe could be evaluated, including in multimessenger schemes. The relevance for searches in future observational runs and interferometers will also be discussed. Time: Thursday 2nd of February, 13.00 Where: MEGA room, NORDITA. -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Mon Feb 20 11:40:25 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Mon, 20 Feb 2023 10:40:25 +0000 Subject: [Okc-wp4] EO meeting 23rd of February Message-ID: Dear everyone, This weeks EO seminar will be given by Ricard Aguilera Miret, who will talk about "Turbulent magnetic field amplification in BNS mergers". Our usual room has been booked by someone else and we will therefore meet at 13:00 in A5:1003. Our speaker will join us remotely and we will use the following zoom link https://stockholmuniversity.zoom.us/j/62363340520 Best, Haakon (on behalf of the EO seminar organizers) When: 23rd of February, 13:00 Where: A5:1003, https://stockholmuniversity.zoom.us/j/62363340520 Speaker: Ricard Aguilera Miret Title: Turbulent magnetic field amplification in BNS mergers Abstract The detection of a binary neutron star merger in 2017 through both gravitational waves and electromagnetic emission opened a new era of multimessenger astronomy. During the merger, several mechanisms like the Kelvin-Helmholtz instability, the winding up effect and the MRI, can amplify the initial magnetic field in the remnant to be powerful enoguh for launching a jet, with an associated short GRB. When performing simulations, simplified assumptions arise for the initial magnetic field strength and topology of the merging neutron stars. Here I will show convergent results by using high-resolution, large-eddy simulations of binary neutron star mergers, following the newly formed remnant for up to 30 milliseconds. I will specifically compare simulations with different initial magnetic field strenghts and configurations, going beyond the widespread-used aligned dipole confined within each star. I will show that the magnetic field is always amplified up to ~10^16 G in the bulk region of the remnant, while the initial topology is quickly forgotten in a timescale of few miliseconds after the merger due to the Kelvin-Helmholtz instability. -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Thu Feb 23 10:44:51 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Thu, 23 Feb 2023 09:44:51 +0000 Subject: [Okc-wp4] EO meeting 23rd of February In-Reply-To: References: Message-ID: Reminder, today at 13:00. Our speaker today will join us remotely, so feel free to join in person in A5:1003 or zoom in. ________________________________ From: Okc-wp4-at-fysik.su.se on behalf of Haakon Andresen via Okc-wp4-at-fysik.su.se Sent: 20 February 2023 11:40:25 To: Okc-wp4 at fysik.su.se Cc: Ricard Aguilera Miret Subject: [Okc-wp4] EO meeting 23rd of February Dear everyone, This weeks EO seminar will be given by Ricard Aguilera Miret, who will talk about "Turbulent magnetic field amplification in BNS mergers". Our usual room has been booked by someone else and we will therefore meet at 13:00 in A5:1003. Our speaker will join us remotely and we will use the following zoom link https://stockholmuniversity.zoom.us/j/62363340520 Best, Haakon (on behalf of the EO seminar organizers) When: 23rd of February, 13:00 Where: A5:1003, https://stockholmuniversity.zoom.us/j/62363340520 Speaker: Ricard Aguilera Miret Title: Turbulent magnetic field amplification in BNS mergers Abstract The detection of a binary neutron star merger in 2017 through both gravitational waves and electromagnetic emission opened a new era of multimessenger astronomy. During the merger, several mechanisms like the Kelvin-Helmholtz instability, the winding up effect and the MRI, can amplify the initial magnetic field in the remnant to be powerful enoguh for launching a jet, with an associated short GRB. When performing simulations, simplified assumptions arise for the initial magnetic field strength and topology of the merging neutron stars. Here I will show convergent results by using high-resolution, large-eddy simulations of binary neutron star mergers, following the newly formed remnant for up to 30 milliseconds. I will specifically compare simulations with different initial magnetic field strenghts and configurations, going beyond the widespread-used aligned dipole confined within each star. I will show that the magnetic field is always amplified up to ~10^16 G in the bulk region of the remnant, while the initial topology is quickly forgotten in a timescale of few miliseconds after the merger due to the Kelvin-Helmholtz instability. -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Thu Mar 2 10:59:35 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Thu, 2 Mar 2023 09:59:35 +0000 Subject: [Okc-wp4] EO meeting March 9th Message-ID: <79cb9be0983d431887c632bae1de0de1@astro.su.se> Dear Everyone, During the EO meeting next week Kaew Samaporn Tinyanont will talk about neutron stars and stripped-envelope supernovae. I look forward to seeing you all in A5:1003. Best, Haakon (on behalf of the EO meeting organizers) When: Mar 9, 13:00 Where: A5:1003 (AlbaNova Main Building) Speaker: Kaew Samaporn Tinyanont Title: Neutron stars and peculiar stripped-envelope supernovae Abstract: Massive stars end their life when the iron core exceeds the Chandrasekhar mass limit and collapses. In the majority of massive stars, a neutron star is born and the outer envelope gets ejected in a core-collapse supernova. The neutron star often plays no role in the subsequent cosmic firework; but when it does, it can create an even more spectacular explosion. In this talk, I will discuss two extreme hydrogen-poor, stripped-envelope supernovae that have likely been powered by a central neutron star. First, I will discuss SN 2020wnt, a very luminous supernova similar to the magnetar-powered superluminous supernovae. But unlike a typical superluminous supernova, SN 2020wnt only shows weak signatures of the neutron star at late times. It is the latest and most luminous member of a growing class of over luminous but spectroscopically normal stripped-envelope supernovae. Second, I will discuss SN 2014C, a hydrogen-poor supernova that starts interacting strongly with its progenitor’s lost hydrogen-rich envelope. Remarkably, very late time spectra reveal that a different powering mechanism, perhaps from the central neutron star, may be at play. I will discuss how upcoming instruments and surveys will help us quantify the roles neutron stars play in core-collapse supernovae. -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Thu Mar 9 09:12:02 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Thu, 9 Mar 2023 08:12:02 +0000 Subject: [Okc-wp4] EO meeting March 9th In-Reply-To: <79cb9be0983d431887c632bae1de0de1@astro.su.se> References: <79cb9be0983d431887c632bae1de0de1@astro.su.se> Message-ID: <4cbcc22fdc2e432ab2b07e105a066bd7@astro.su.se> Reminder of today's meeting, see you at 13:00 in A5:1003. Best, Haakon (on behalf of the EO meeting organizers) ________________________________ From: Okc-wp4-at-fysik.su.se on behalf of Haakon Andresen via Okc-wp4-at-fysik.su.se Sent: 02 March 2023 10:59:35 To: Okc-wp4 at fysik.su.se Subject: [Okc-wp4] EO meeting March 9th Dear Everyone, During the EO meeting next week Kaew Samaporn Tinyanont will talk about neutron stars and stripped-envelope supernovae. I look forward to seeing you all in A5:1003. Best, Haakon (on behalf of the EO meeting organizers) When: Mar 9, 13:00 Where: A5:1003 (AlbaNova Main Building) Speaker: Kaew Samaporn Tinyanont Title: Neutron stars and peculiar stripped-envelope supernovae Abstract: Massive stars end their life when the iron core exceeds the Chandrasekhar mass limit and collapses. In the majority of massive stars, a neutron star is born and the outer envelope gets ejected in a core-collapse supernova. The neutron star often plays no role in the subsequent cosmic firework; but when it does, it can create an even more spectacular explosion. In this talk, I will discuss two extreme hydrogen-poor, stripped-envelope supernovae that have likely been powered by a central neutron star. First, I will discuss SN 2020wnt, a very luminous supernova similar to the magnetar-powered superluminous supernovae. But unlike a typical superluminous supernova, SN 2020wnt only shows weak signatures of the neutron star at late times. It is the latest and most luminous member of a growing class of over luminous but spectroscopically normal stripped-envelope supernovae. Second, I will discuss SN 2014C, a hydrogen-poor supernova that starts interacting strongly with its progenitor’s lost hydrogen-rich envelope. Remarkably, very late time spectra reveal that a different powering mechanism, perhaps from the central neutron star, may be at play. I will discuss how upcoming instruments and surveys will help us quantify the roles neutron stars play in core-collapse supernovae. -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Tue Apr 4 17:05:45 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Tue, 4 Apr 2023 15:05:45 +0000 Subject: [Okc-wp4] Will you be able to attend EO meetings around Easter? Message-ID: Dear everyone, We have an EO meeting scheduled for Thursday this week, but many of you might be away for the holiday. I expect this might be true for next week to. I created a poll in the OKC-slack EO channel to gauge the potential attendance of a meeting on the 6th or the 13th. If you do not mind, please take the time to answer the poll. If you do not use slack, feel free to email me. Best, Haakon (on behalf of the organizers) -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Wed Apr 5 17:03:06 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Wed, 5 Apr 2023 15:03:06 +0000 Subject: [Okc-wp4] Postponing the EO meeting Message-ID: Dear everyone, Due to the number of EO members away for easter, we have decided to postpone tomorrows meeting. We will resume on the 27th of April with Anders Jerkstrand discussing: StandaRT : a 5-year supernova code comparison project. First results on Type Ia supernova light curves and spectra. Best, Haakon (on behalf of the organizers) -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Mon Apr 24 16:07:13 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Mon, 24 Apr 2023 14:07:13 +0000 Subject: [Okc-wp4] EO meeting on the 27th of April Message-ID: <9ad193281724405ebb29c9a55e6eeaa9@astro.su.se> Hi everyone, Our next EO meeting will take place On Thursday 27th of April at 13:00. We will meet in room A5:1003(AlbaNova Main Building). Speaker: Anders Jerkstrand Title: StandaRT : a 5-year supernova code comparison project. First results on Type Ia supernova light curves and spectra. Look forward to seeing you all there. Best regards, Haakon (on behalf of the EO organizers) PS: If you need a zoom-link let me know PPS: If you would like to give a talk soon also let me know. -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Thu Apr 27 12:08:14 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Thu, 27 Apr 2023 10:08:14 +0000 Subject: [Okc-wp4] EO meeting on the 27th of April In-Reply-To: <9ad193281724405ebb29c9a55e6eeaa9@astro.su.se> References: <9ad193281724405ebb29c9a55e6eeaa9@astro.su.se> Message-ID: <6e31ea72bc3a4d008196445c6ccc24bc@astro.su.se> Reminder of today's meeting. A5:1003 at 13:00. ________________________________ From: Okc-wp4-at-fysik.su.se on behalf of Haakon Andresen via Okc-wp4-at-fysik.su.se Sent: 24 April 2023 16:07:13 To: Okc-wp4 at fysik.su.se Subject: [Okc-wp4] EO meeting on the 27th of April Hi everyone, Our next EO meeting will take place On Thursday 27th of April at 13:00. We will meet in room A5:1003(AlbaNova Main Building). Speaker: Anders Jerkstrand Title: StandaRT : a 5-year supernova code comparison project. First results on Type Ia supernova light curves and spectra. Look forward to seeing you all there. Best regards, Haakon (on behalf of the EO organizers) PS: If you need a zoom-link let me know PPS: If you would like to give a talk soon also let me know. -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Thu Apr 27 12:58:29 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Thu, 27 Apr 2023 10:58:29 +0000 Subject: [Okc-wp4] EO meeting on the 27th of April In-Reply-To: <6e31ea72bc3a4d008196445c6ccc24bc@astro.su.se> References: <9ad193281724405ebb29c9a55e6eeaa9@astro.su.se>, <6e31ea72bc3a4d008196445c6ccc24bc@astro.su.se> Message-ID: <5da4152be82d47ceadbf687fba0b9dc1@astro.su.se> Hi everyone, Due to room booking conflicts we will in FC61 on the 6th floor. Sorry for the inconvenience. ________________________________ From: Okc-wp4-at-fysik.su.se on behalf of Haakon Andresen via Okc-wp4-at-fysik.su.se Sent: 27 April 2023 12:08:14 To: Okc-wp4 at fysik.su.se Subject: Re: [Okc-wp4] EO meeting on the 27th of April Reminder of today's meeting. A5:1003 at 13:00. ________________________________ From: Okc-wp4-at-fysik.su.se on behalf of Haakon Andresen via Okc-wp4-at-fysik.su.se Sent: 24 April 2023 16:07:13 To: Okc-wp4 at fysik.su.se Subject: [Okc-wp4] EO meeting on the 27th of April Hi everyone, Our next EO meeting will take place On Thursday 27th of April at 13:00. We will meet in room A5:1003(AlbaNova Main Building). Speaker: Anders Jerkstrand Title: StandaRT : a 5-year supernova code comparison project. First results on Type Ia supernova light curves and spectra. Look forward to seeing you all there. Best regards, Haakon (on behalf of the EO organizers) PS: If you need a zoom-link let me know PPS: If you would like to give a talk soon also let me know. -------------- next part -------------- An HTML attachment was scrubbed... URL: From stephan.rosswog at astro.su.se Thu Apr 27 13:05:22 2023 From: stephan.rosswog at astro.su.se (Stephan Rosswog) Date: Thu, 27 Apr 2023 11:05:22 +0000 Subject: [Okc-wp4] EO meeting on the 27th of April In-Reply-To: <5da4152be82d47ceadbf687fba0b9dc1@astro.su.se> References: <9ad193281724405ebb29c9a55e6eeaa9@astro.su.se> <6e31ea72bc3a4d008196445c6ccc24bc@astro.su.se> <5da4152be82d47ceadbf687fba0b9dc1@astro.su.se> Message-ID: Is there a zoom link? Best Stephan On 27 Apr 2023, at 12:58, Haakon Andresen via Okc-wp4-at-fysik.su.se > wrote: Hi everyone, Due to room booking conflicts we will in FC61 on the 6th floor. Sorry for the inconvenience. ________________________________ From: Okc-wp4-at-fysik.su.se > on behalf of Haakon Andresen via Okc-wp4-at-fysik.su.se > Sent: 27 April 2023 12:08:14 To: Okc-wp4 at fysik.su.se Subject: Re: [Okc-wp4] EO meeting on the 27th of April Reminder of today's meeting. A5:1003 at 13:00. ________________________________ From: Okc-wp4-at-fysik.su.se > on behalf of Haakon Andresen via Okc-wp4-at-fysik.su.se > Sent: 24 April 2023 16:07:13 To: Okc-wp4 at fysik.su.se Subject: [Okc-wp4] EO meeting on the 27th of April Hi everyone, Our next EO meeting will take place On Thursday 27th of April at 13:00. We will meet in room A5:1003(AlbaNova Main Building). Speaker: Anders Jerkstrand Title: StandaRT : a 5-year supernova code comparison project. First results on Type Ia supernova light curves and spectra. Look forward to seeing you all there. Best regards, Haakon (on behalf of the EO organizers) PS: If you need a zoom-link let me know PPS: If you would like to give a talk soon also let me know. ------------------------------------------------- okc-wp4 at albanova.se mailing list ---------------------------------------------- Prof. Dr. Stephan Rosswog Computational High-Energy Astrophysics The Oskar Klein Centre for Cosmoparticle Physics Department of Astronomy, Stockholm University AlbaNova, Roslagstullbacken 21 SE-10691 Stockholm, Sweden Email: stephan.rosswog at astro.su.se Tel.: +46 (0)8 5537 8529 URL: http://compact-merger.astro.su.se/ -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Thu May 11 08:53:27 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Thu, 11 May 2023 06:53:27 +0000 Subject: [Okc-wp4] Upcoming EO seminars Message-ID: <046a5d2d5ae94c95a6305b86e5deb60c@astro.su.se> Dear Everyone, I hope you are all well and enjoying the onset of spring and the beautiful weather. Summer is fast approaching and due to holidays and an OKC day, we will only have two more meetings before Midsummer. The schedule currently looks like this: 18th of May: Canceled due to holiday 25th of May: Albert Sneppen 8th of June: Cancelled due to the OKC event 15th June: Linda Tenhu We will return to our beloved MEGA room for both meetings and we can set up zoom upon request. Meetings will be announced as normal, but I wanted to give a small update due to the recent reshuffling of meetings. Best, Haakon (on the behalf of the organizers ) PS: Let us know if you want to present something in the fall. -------------- next part -------------- An HTML attachment was scrubbed... URL: From ana.sagues-carracedo at fysik.su.se Wed May 24 11:43:21 2023 From: ana.sagues-carracedo at fysik.su.se (=?iso-8859-1?Q?Ana_Sagu=E9s_Carracedo?=) Date: Wed, 24 May 2023 09:43:21 +0000 Subject: [Okc-wp4] 25 May EO meeting Albert Sneppen Message-ID: Tomorrow at 13:00 in the Extreme Object meeting, Albert Sneppen will talk about the identification of yttrium in a kilonova photosphere. Hope to see you all there! When: May 25th at 13:00 Where: MEGA room (Nordita 6th floor) (zoom under previous request) Speaker: Albert Sneppen Title: Identification of yttrium in a kilonova photosphere Abstract: Neutron star mergers are believed to be a major cosmological source of rapid neutron-capture elements. However, the kilonovae associated with neutron star mergers have to date yielded only a single well-identified spectral signature: the P Cygni line of Sr II at about 1 micron in the spectra of the optical transient, AT2017gfo. Such P Cygni lines are important, because they provide significant information not just potentially on the elemental composition of the merger ejecta, but also on the velocity, geometry, and abundance stratification of the explosion. In this talk, I will present evidence for a previously unrecognised P Cygni line in the spectra of AT2017gfo that emerged several days after the explosion. We show that such a feature is actually predicted by the 4d^2--4d5p transitions in Y II in terms of central wavelength, velocity stratification, prominence of the feature and the timing of the first appearance. We will discuss the implications of this identification for the synthesis of the heaviest elements in the universe. -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Mon Jun 5 09:54:29 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Mon, 5 Jun 2023 07:54:29 +0000 Subject: [Okc-wp4] EO related talk on Friday Message-ID: <97ce899698d4494faa677da113e2791b@astro.su.se> Dear Everyone, While there is no EO seminar this week, Felix Ryde has a visitor that will give a talk on the 9th (Friday), that should be off interest to several of us. The details are below. Best, Haakon Title: General Coordinates Network (GCN): NASA's Next Generation Alert System for Time-domain and Multimessenger Astronomy Speaker: Vidushi Sharma, NASA/GSFC Friday 9 June at 14:00 Room: A5:1003(AlbaNova Main Building) Content: Gamma-ray Coordinates Network (GCN) is a collaborative platform operated by NASA to facilitate the sharing of alerts and quick communications regarding high-energy, transient, and multimessenger phenomena among the astronomy research community. Over the last 30 years, GCNhas enabled significant advances by disseminating observations, predictions, requests for follow-up observations, and observing plans. GCN distributes alerts between space and ground-based observatories, physics experiments, and thousands of astronomers worldwide. As new transient instruments spanning the electromagnetic spectrum and multimessenger facilities become available, coordinating efforts have become more vital and complex than ever. Introducing the General Coordinates Network (GCN), an updated version of GCN designed with modern, open-source, reliable, and secure alert distribution technologies, and deployed in the cloud. The new GCN is built on Apache Kafka, the same alert streaming technology that the Vera C. Rubin observatory uses. We will present the current status and design of the new GCN, the streaming of notices and circular alerts with Kafka, and a vision of its growth as a community resource in the future. -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Wed Jun 14 09:25:27 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Wed, 14 Jun 2023 07:25:27 +0000 Subject: [Okc-wp4] Reminder: Tomorrows EO seminar Message-ID: <32ab1ed66126497bb2b7314712574cbe@astro.su.se> Dear Everyone, Tomorrow we will have our last seminar before the summer break. Our very own Linda Tenhu will close us out for the summer. We will meet in the MEGA room, if you can not come in person let me know and I will make sure to set up the zoom. Hope to see you all there. Best, Haakon (on the behalf of the EO organizers ) When: 15th of June at 13:00 Where: MEGA room Speaker: Linda Tenhu Title: The optical-NIR spectrum of the pulsar and PWN in SNR 0540 -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Mon Jun 19 16:46:45 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Mon, 19 Jun 2023 14:46:45 +0000 Subject: [Okc-wp4] Seminars for next semester Message-ID: Dear everyone, We are already looking for speakers for the next round of EO meetings. It is still early, but if anyone wants to give a talk next semester, have any visitors or other suggestions for talks please let us know. The sooner we can lock down some spots the better. If you have any questions, input or speaker suggestions feel free to contact me or the other organizers. A big thanks to everyone who helped fill the scheduled this semester and I wish you all a nice summer break! Best, Haakon -------------- next part -------------- An HTML attachment was scrubbed... URL: From ana.sagues-carracedo at fysik.su.se Tue Sep 5 13:08:18 2023 From: ana.sagues-carracedo at fysik.su.se (=?iso-8859-1?Q?Ana_Sagu=E9s_Carracedo?=) Date: Tue, 5 Sep 2023 11:08:18 +0000 Subject: [Okc-wp4] Intro EO meeting 8th September Message-ID: Dear Extreme Object people, I'm excited to announce our first meeting after the summer break. I hope everyone enjoyed some well-deserved rest and is ready for a new series of fantastic talks and discussions. Meeting Details: * Date: Thursday, September 7th * Time: 12:00 PM - 1:00 PM. Lunchtime! * Location: Astronomy Department, Huset 3 During this meeting, we will have an informal introduction round, allowing us to reconnect with familiar faces and warmly welcome newcomers. To facilitate this introduction, we kindly ask you to add your name and research topic to the second slide of our shared presentation, accessible here. Please share this message with any colleague interested in joining the EO meetings. Wishing to see most of you! Best regards, Ana & Haakon -------------- next part -------------- An HTML attachment was scrubbed... URL: From ana.sagues-carracedo at fysik.su.se Tue Sep 5 13:10:20 2023 From: ana.sagues-carracedo at fysik.su.se (=?utf-8?B?QW5hIFNhZ3XDqXMgQ2FycmFjZWRv?=) Date: Tue, 5 Sep 2023 11:10:20 +0000 Subject: [Okc-wp4] Intro EO meeting 8th September In-Reply-To: References: Message-ID: Sorry, fixing typo : * Date: Friday, September 8th On 5 Sep 2023, at 13:08, Ana Sagués Carracedo wrote: Dear Extreme Object people, I'm excited to announce our first meeting after the summer break. I hope everyone enjoyed some well-deserved rest and is ready for a new series of fantastic talks and discussions. Meeting Details: * Date: Thursday, September 7th * Time: 12:00 PM - 1:00 PM. Lunchtime! * Location: Astronomy Department, Huset 3 During this meeting, we will have an informal introduction round, allowing us to reconnect with familiar faces and warmly welcome newcomers. To facilitate this introduction, we kindly ask you to add your name and research topic to the second slide of our shared presentation, accessible here. Please share this message with any colleague interested in joining the EO meetings. Wishing to see most of you! Best regards, Ana & Haakon -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Thu Sep 7 16:14:09 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Thu, 7 Sep 2023 14:14:09 +0000 Subject: [Okc-wp4] First meeting of the fall semester: Get to know old and new EO members Message-ID: Dear EO members, We will start the semester with an introduction session where we will go around the room and ask everyone to say a few words about their work. Ana has prepared a google slide where you can add your name and we will use that as the basis of the session. https://docs.google.com/presentation/d/1nxDq8rKfUV-52pVU57ONF5LBQbdGcqcpPEMMlMW_5GA/edit?usp=sharing Note the unusual time and place. We will return to our regular programing for the next meeting and a schedule for the fall will follow shortly. Best, Haakon (on behalf of the EO organizers ) Meeting Details: * Date: Friday, September 8th * Time: 12:00 PM - 1:00 PM. Lunchtime! * Location: Astronomy Department, Huset 3 -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Fri Sep 15 10:38:23 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Fri, 15 Sep 2023 08:38:23 +0000 Subject: [Okc-wp4] EO seminar on the 21st of September Message-ID: Hi everyone, Our next talk will be on the 21st at 13:00 in Albanova A5:1003. Title: 1100 Days in the Life of the Supernova 2018ibb --- the Best Pair-Instability Supernova Candidate, to date Speaker: Steve Schulze Abstract: Super-luminous supernovae (SLSNe) were discovered over a decade ago, but their sources of energy and progenitors remain enigmatic. Over the past years, we carried out a systematic survey on SLSNe with the Zwicky Transient Facility to map out the parameter space of SLSN properties and find the most extreme SLSNe. 2018ibb is one the most extreme and exciting SLSNe known today. Between mid-2018 and early 2022, we monitored its photometric and spectroscopic evolution from the UV to the NIR with 2-10m class telescopes to unravel its powering mechanism and progenitor. In this talk, I will present the rich and perplexing properties of 2018ibb. I will compare existing SLSN models with the data to argue that 2018ibb is powered by 25-44 solar masses of freshly nucleosynthesised Ni-56 and that 2018ibb is, hence, very likely a pair-instability supernova. However, the picture of 2018ibb is more complex than existing PISNe models can currently capture. In the remainder of the talk, I will discuss these “issues” and put forward suggestions on how PISN models could be expanded. This work is based on the recently submitted paper: https://arxiv.org/abs/2305.05796. When: 21st 13:000 Where: Albanova A5:1003 (KTH room) Best, Haakon (on behalf of the EO organisers) -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Thu Sep 21 08:43:56 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Thu, 21 Sep 2023 06:43:56 +0000 Subject: [Okc-wp4] Reminder for todays meeting Message-ID: <41425915e7024da1b0d41192ea3cc1a1@astro.su.se> We meet at 13:00 in Albanova A5:1003 Title: 1100 Days in the Life of the Supernova 2018ibb --- the Best Pair-Instability Supernova Candidate, to date Speaker: Steve Schulz -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Tue Oct 3 11:46:10 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Tue, 3 Oct 2023 09:46:10 +0000 Subject: [Okc-wp4] EO seminar on the 5th of October: Tidal Deformability of Neutron Stars in Scalar-Tensor Theories of Gravity for Gravitational Wave Analysis Message-ID: <0df5d4cdb01a4b5f88dbc9686e1d4d3d@astro.su.se> Dear everyone, This weeks seminar will be held by one of the most recent additions to the EO group, Alex Brown. The presentation will focus on material published here https://arxiv.org/abs/2210.14025 I look forward to seeing you all there, zoom can be setup upon request. Let me know if you are away and still would like to attend. We will meet in A5:1003, as last time. All events are now in the calendar, which you can find here https://indico.fysik.su.se/category/289/ It can easily be imported into any calendar software. Speaker: Stephanie (Alex) Brown Title: Tidal Deformability of Neutron Stars in Scalar-Tensor Theories of Gravity for Gravitational Wave Analysis Room: A5:1003 Abstract: Gravitational waves from compact binary coalescences are valuable for testing theories of gravity in the strong-field regime. They have also led to improved constraints on the nuclear equation of state at extreme densities by measuring the tidal Love numbers of merging neutron stars. Tidal Love numbers in alternate theories are expected to differ from their general relativistic counterpart. Despite this, tests of general relativity use the general relativistic tidal Love numbers. Here, we calculate the $l\geq 2$ electric and magnetic tidal Love numbers for non-rotating stars in mono-scalar-tensor theories assuming spontaneous scalarization. We then use several viable equations of state to explore how the mass, radius, and tidal deformability relations differ from those of general relativity. The electric tidal deformability can differ by $\sim 350\%$, and the magnetic tidal deformability differs by $\sim 200 \%$. These deviations occur at large compactnesses ($C = M/r > 0.2$) and vary slightly depending on the equation of state. Lastly, we perform Bayesian parameter estimation of GW170817 to explore exactly how these modified tidal relations can effect inference. We find that tidal Love numbers and tidal deformabilities can differ significantly from those in general relativity. These changes cause the inferred equation of state to differ between general relativity and scalar tensor theory. Applying these tidal Love numbers to the study of gravitational waves will allow for more consistent and accurate tests of scalar modes in gravitational waves from neutron star mergers. Best, Haakon (on behalf of the organizers of the EO meeting) -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Mon Oct 9 13:07:59 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Mon, 9 Oct 2023 11:07:59 +0000 Subject: [Okc-wp4] Estra meeting, Soheb Mandhai: Exploring the interplay between compact binaries and their host environments Message-ID: <7e8122f0bfeb47059bef79f0d3c6b9bc@astro.su.se> Dear everyone, This week we will have an extra meeting held by Soheb Mandhai who is visiting Stockholm. Where: A5:1003 at 13.00 Title: Exploring the interplay between compact binaries and their host environments Abstract: In the era of multi-messenger astronomy including gravitational wave and electromagnetic detections, it is quintessential to formulate strategies that can optimise follow-up campaigns. The electromagnetic counterparts (EMC) of gravitational wave (GW) events arising from the coalescence of two merging compact objects, namely a neutron star paired with another neutron star (NSNS)/black-hole (BHNS), have become increasingly topical over the last few years following the GW170817A. In this study, we explore the host galaxy environments and offsets of these binaries (in addition to binary stellar mass black-holes) upon merging. This is accomplished by seeding and dynamically evolving synthetic isolated systems within hydrodynamical galaxies produced by the cosmological simulation, EAGLE. This approach also allows for constraints to be placed on the relative cosmic rate of EM bright binary mergers. Using constraints on the mass ratio of the primary and secondary compact objects, we explore the likelihood of observing potential short-duration gamma-ray bursts (SGRBs) using the Swift/BAT instrument resulting from these systems and compare them to real observations. The work underlined can be used to formulate strategies to optimise the efforts to search and localise transients (such as SGRBs and their afterglows, kilonovae, and potentially fast radio bursts) to their most likely host galaxies/environment, during the follow-up of LVK observational runs such as the ongoing O4 and beyond. We further extend the framework developed to study binaries within the Milky Way (MW). We apply this to a type of binary known as a spidery pulsars :- a cannibalistic system where a low-mass companion is ablated by the primary pulsar. We explore the orbits and dynamics of these systems and their migration within a detailed simulated MW analogue. The aim of this ongoing research is to produce a zoo of binaries, identify the regions within the galaxy that they are likely to occupy, and predict the fraction that will be detectable in the foreground emission of low-frequency gravitational wave detectors such as the DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) and Laser Interferometer Space Antenna (LISA). Best, Haakon (on the behalf of the EO organizers) -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Mon Oct 16 08:59:54 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Mon, 16 Oct 2023 06:59:54 +0000 Subject: [Okc-wp4] New EO organizer Message-ID: <6b3aacaad4754b2fb4900a77c14f52b7@astro.su.se> Dear everyone, As mentioned at the last EO meeting, there have been some changes in the organizational part of the EO seminars. Smaranika Banerjee (smaranika.banerjee at astro.su.se) has taken over for Ana and will, together with me, organize the meetings from this point on. On the behalf of everyone in the EO group, thank you for volunteering Smaranika. I am sure I also speak for everyone when extending a big thanks to you Ana, for all the work and effort you have put in. Looking forward, there has been suggestions to change the seminar formate to foster discussion and to help make seminars that are further away from your own work more rewarding, we are after all a rather broad group. Our next speaker has agreed to test this formate and I hope to see you all there next week. In case of input or comments, feel free to contact me or Smaranika. Best, Haakon -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Tue Nov 7 09:33:52 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Tue, 7 Nov 2023 08:33:52 +0000 Subject: [Okc-wp4] EO seminar 9th of November Message-ID: <7f6b4772d4ea42498cff01b821a138c3@astro.su.se> Dear everyone, This weeks EO seminar will take place in A5:1003 and our speaker will be Ersilia Guarini. Ersilia is visiting from the Niels Bohr institute and will be here on Friday as well. I will take the speaker out for dinner on Thursday, let me know if you wish to join. When/where: A5:1003/13:00 Speaker: Ersilia Guarini Title: Exploring the Transient Universe with Ghostly Messengers Abstract: Astrophysical transients are among the most enigmatic cosmic events ever observed. Besides being electromagnetically puzzling, they may also be copious factories of high energy neutrinos. Due to their elusive nature, neutrinos point back to the source that produced them, granting us the unique opportunity to test the most extreme astrophysical environments. In this talk, we will dive into the potential of these ghostly messengers to probe a wide range of astrophysical transients stemming from collapsing massive stars, including supernovae (SNe), gamma-ray bursts (GRBs) and fast blue optical transients (FBOTs). In preparation for the upcoming neutrino telescopes and electromagnetic surveys, we will outline a strategy to optimize multi-messenger follow-up searches from explosive transients. Only by leveraging multi-messenger synergies, can we have a clear picture of the nature of the most energetic phenomena occurring in our Universe. Best, Haakon (on behalf of the EO organizers) -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Mon Nov 13 11:52:39 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Mon, 13 Nov 2023 10:52:39 +0000 Subject: [Okc-wp4] Meeting on Thursday 16th Message-ID: Dear everyone, We will have a EO meeting this week to. Our speaker is Tatsuya Matsumoto, visiting from Kyoto Universtiy. We will meet in A5:1003 at 13.00 Title: A new analytical approach to analyze shock interacting supernovae Abstract: Recent observations discovered that a small fraction of core-collapse supernovae (SNe) show peculiar light curves such as double peaks and bumpy structure. A promising mechanism to produce these behaviors is a shock interaction between SN ejecta and circumstellar material (CSM). In this scenario, the light curve is shaped by the emission from the shock and the CSM should have a non-uniform density profile corresponding to the observed peaks or bumps, which may tell us the last activity of massive stars before core-collapse. However, most studies on shock interacting SNe assume a power-law like smooth CSM density profiles and cannot be applied to multi-peak SNe. In this talk, I propose a new analytical technique to analyze multi-peak SNe and estimate the CSM profile. I’ll demonstrate its application to observed several SNe, reconstruct the CSM profile, and estimate the SN ejecta parameters. Best, Haakon (on behalf of the organizers) -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Wed Nov 29 11:26:42 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Wed, 29 Nov 2023 10:26:42 +0000 Subject: [Okc-wp4] Cancled: Meeting on the 30th of November Message-ID: <157b4b71a87f49a3ad00a16ec2aa8bee@astro.su.se> Dear everyone, Unfortunately, we have have to cancel tomorrows meeting. The next meeting will take place on December 7th. Best, Haakon (on behalf of the organizers) -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Fri Dec 8 10:21:02 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Fri, 8 Dec 2023 09:21:02 +0000 Subject: [Okc-wp4] Joint EO/NORDITA seminar on the 13th of December, note the irregular time. Message-ID: <9ff46c6e703b4e5f800c7b5ebd47908d@astro.su.se> Hi, The time for next weeks talk will be irregular, because we will hold a joint seminar with the Nordita Astrophysics Seminar. Hope to see many of you there, even if the time is unusual. When and where: 13:30 in Albano 3: 6228 - Mega. Speaker: Charlotte Angus Title: Exploring exotic transients in modern surveys Abstract: The advent of wide-field time-domain optical surveys has changed the landscape of transient astronomy. Not only have they dramatically increased the rate of transient discoveries, they have allowed us to unearth new, previously unheard of, transient classes. The wide variety of different survey strategies available play a pivotal role in how we can probe the physics behind these new and exotic transients. In this talk I will demonstrate how two different surveys have done this. The Dark Energy Survey (DES), using deep multi-band imaging, has significantly broadened the definition and understanding of Superluminous Supernovae (SLSNe), unveiling the nature of pre-peak bumps, while the high cadence, Young Supernova Experiment (YSE), designed to probe the earliest transient epochs, has uncovered a rapidly evolving tidal disruption event uniquely hosted by an intermediate mass black hole. These two complementary approaches allow distinct insights into the nature of some of the most extreme physical processes in the Universe, and help us to prepare for future surveys, such as LSST. Best, Haakon (on behalf of the organizers) -------------- next part -------------- An HTML attachment was scrubbed... URL: From haakon.andresen at astro.su.se Wed Dec 13 10:12:36 2023 From: haakon.andresen at astro.su.se (Haakon Andresen) Date: Wed, 13 Dec 2023 09:12:36 +0000 Subject: [Okc-wp4] Seminar reminder Message-ID: <050caf9a1b6a4cc9bb40ce59b3849997@astro.su.se> Dear everyone, A reminder of today's joint seminar with NORDITA. Best, Haakon Today at 13:30 in Albano 3: 6228 - Mega. Speaker: Charlotte Angus Title: Exploring exotic transients in modern surveys Abstract: The advent of wide-field time-domain optical surveys has changed the landscape of transient astronomy. Not only have they dramatically increased the rate of transient discoveries, they have allowed us to unearth new, previously unheard of, transient classes. The wide variety of different survey strategies available play a pivotal role in how we can probe the physics behind these new and exotic transients. In this talk I will demonstrate how two different surveys have done this. The Dark Energy Survey (DES), using deep multi-band imaging, has significantly broadened the definition and understanding of Superluminous Supernovae (SLSNe), unveiling the nature of pre-peak bumps, while the high cadence, Young Supernova Experiment (YSE), designed to probe the earliest transient epochs, has uncovered a rapidly evolving tidal disruption event uniquely hosted by an intermediate mass black hole. These two complementary approaches allow distinct insights into the nature of some of the most extreme physical processes in the Universe, and help us to prepare for future surveys, such as LSST -------------- next part -------------- An HTML attachment was scrubbed... URL: