From seminars-announce.astro-at-su.se at lists.su.se Mon Jan 29 14:36:35 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 29 Jan 2024 13:36:35 +0000 Subject: [Astronomy seminar] Astronomy departmental seminar Friday February 2 at 10:30am - Mahsa Sanati (Chalmers) Message-ID: Dear all, The next SU astronomy departmental seminar (first of 2024) will take place on Friday February 2 at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (**NEW ZOOM MEETING** https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Mahsa Sanati (Chalmers) Title: From first stars to supermassive blackholes Event: https://indico.fysik.su.se/e/mahsa_sanati Abstract: Evidence supporting the existence of supermassive black holes (SMBHs), which host extremely bright quasars at high redshifts, imposes constraints on the formation and growth of their initial seeds. Recent JWST observations reveal the presence of such SMBHs at even earlier epochs, providing only a few hundred million years for the black hole seeds to accrete gas and grow. The choice of a Eddington limited accretion is a common practice in modelling the growth of SMBH seeds, however, there are numerous uncertainties regarding their accretion during initial stages. We propose a model for the formation of SMBHs from the remnants of a specific class of first stars known as Population III.1 stars, forming within isolated dark matter mini-halos in the early Universe. In this model, SMBHs undergo growth through mergers and gas accretion, with their growth being regulated by AGN feedback. The talk aims to explore the growth and activity of SMBHs forming from Pop III.1 stars in cosmological simulations and the traces of this scenario in the epoch of reionization. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-02-09 Andrius Popovas 2024-02-16 Daniel Siegel 2024-02-21 Johan Richard (**Seminar on WEDNESDAY**) 2024-03-01 ** No seminar ** 2024-03-08 TBA 2024-03-15 Joe Lewis 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Feb 2 09:41:16 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 2 Feb 2024 08:41:16 +0000 Subject: [Astronomy seminar] Reminder: Astronomy departmental seminar Friday February 2 at 10:30am - Mahsa Sanati (Chalmers) Message-ID: Dear all, This is a reminder of the weekly SU astronomy departmental seminar that will take place in about 48 minutes, at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (**NEW ZOOM MEETING** https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). As usual, we encourage you to attend in person if possible. ___________________ Speaker: Mahsa Sanati (Chalmers) Title: From first stars to supermassive blackholes Event: https://indico.fysik.su.se/e/mahsa_sanati Abstract: Evidence supporting the existence of supermassive black holes (SMBHs), which host extremely bright quasars at high redshifts, imposes constraints on the formation and growth of their initial seeds. Recent JWST observations reveal the presence of such SMBHs at even earlier epochs, providing only a few hundred million years for the black hole seeds to accrete gas and grow. The choice of a Eddington limited accretion is a common practice in modelling the growth of SMBH seeds, however, there are numerous uncertainties regarding their accretion during initial stages. We propose a model for the formation of SMBHs from the remnants of a specific class of first stars known as Population III.1 stars, forming within isolated dark matter mini-halos in the early Universe. In this model, SMBHs undergo growth through mergers and gas accretion, with their growth being regulated by AGN feedback. The talk aims to explore the growth and activity of SMBHs forming from Pop III.1 stars in cosmological simulations and the traces of this scenario in the epoch of reionization. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-02-09 Andrius Popovas 2024-02-16 Daniel Siegel 2024-02-21 Johan Richard (**Seminar on WEDNESDAY**) 2024-03-01 ** No seminar ** 2024-03-08 TBA 2024-03-15 Joe Lewis 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Feb 5 12:23:44 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 5 Feb 2024 11:23:44 +0000 Subject: [Astronomy seminar] Astronomy departmental seminar Friday February 9 at 10:30am - Andrius Popovas (RoCS - UiO) Message-ID: Dear all, The next SU astronomy departmental seminar will take place on Friday February 9 at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Andrius Popovas (RoCS - UiO) Title: Realistic Simulations of Solar Dynamics Event: https://indico.fysik.su.se/e/andrius_popovas Abstract: Due largely to computational resource limitations, solar research evolved as distinct “internal-” and “surface-” related research fields, preventing an integrated global view of the Sun's complex plasma dynamics. However, the Sun encompasses large-scale hierarchical structures, extending from its deep core to its outer atmosphere. Magnetic flux, pivotal for many phenomena, such as sunspots and solar flares, may be generated through both local and large-scale dynamo actions within the solar interior, interacting with motions in the convection zone that are ultimately driven by cooling at the very surface. The current advancements in high performance computing (HPC) infrastructure finally allows us to address the burgeoning need for an integrated understanding of the solar dynamics from the core to the photosphere and beyond. In this talk I will overview what insights we already got from the large scale simulations and present the current state of our work in progress – the global compressible MHD simulations covering the entire convection zone of the Sun. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-02-16 Daniel Siegel 2024-02-21 Johan Richard (**Seminar on WEDNESDAY**) 2024-03-01 ** No seminar ** 2024-03-08 TBA 2024-03-15 Joe Lewis 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** 2024-04-05 Simon Ringqvist You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Feb 9 09:39:24 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 9 Feb 2024 09:39:24 +0100 Subject: [Astronomy seminar] Reminder: Astronomy departmental seminar Friday February 9 at 10:30am - Andrius Popovas (RoCS - UiO) Message-ID: Dear all, This is a reminder of the weekly SU astronomy departmental seminar that will take place in about 50 minutes, at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). As usual, we encourage you to attend in person if possible. ___________________ Speaker: Andrius Popovas (RoCS - UiO) Title: Realistic Simulations of Solar Dynamics Event: https://indico.fysik.su.se/e/andrius_popovas Abstract: Due largely to computational resource limitations, solar research evolved as distinct “internal-” and “surface-” related research fields, preventing an integrated global view of the Sun's complex plasma dynamics. However, the Sun encompasses large-scale hierarchical structures, extending from its deep core to its outer atmosphere. Magnetic flux, pivotal for many phenomena, such as sunspots and solar flares, may be generated through both local and large-scale dynamo actions within the solar interior, interacting with motions in the convection zone that are ultimately driven by cooling at the very surface. The current advancements in high performance computing (HPC) infrastructure finally allows us to address the burgeoning need for an integrated understanding of the solar dynamics from the core to the photosphere and beyond. In this talk I will overview what insights we already got from the large scale simulations and present the current state of our work in progress – the global compressible MHD simulations covering the entire convection zone of the Sun. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-02-16 Daniel Siegel 2024-02-21 Johan Richard (**Seminar on WEDNESDAY**) 2024-03-01 ** No seminar ** 2024-03-08 TBA 2024-03-15 Joe Lewis 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** 2024-04-05 Simon Ringqvist You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 From seminars-announce.astro-at-su.se at lists.su.se Mon Feb 12 13:25:52 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 12 Feb 2024 13:25:52 +0100 Subject: [Astronomy seminar] Astronomy departmental seminar Friday February 16 at 10:30am - Daniel Siegel (University of Greifswald) Message-ID: Dear all, The next SU astronomy departmental seminar will take place on Friday February 16 at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Daniel Siegel (University of Greifswald) Title: Nucleosynthesis and electromagnetic transients from neutron-star mergers and rare types of core-collapse supernovae Event: https://indico.fysik.su.se/e/daniel_siegel Abstract: Multi-messenger astronomy sheds light on the astrophysics of black holes and neutron stars and also enables unique probes of fundamental physics. I will discuss recent results on how the mergers of neutron stars as well as other explosive systems, such as the death of massive, rotating stars, give rise to the formation of heavy elements in the universe. In particular, I will discuss recent results at the interface of numerical relativity, relativistic astrophysics, and nuclear astrophysics, and highlight how multi-messenger astronomy may lead to the answer of a 70-year old fundamental question in physics: How does the Universe create the heaviest elements? ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-02-21 Johan Richard (**Seminar on WEDNESDAY**) 2024-03-01 ** No seminar ** 2024-03-08 TBA 2024-03-15 Joe Lewis 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** 2024-04-05 Simon Ringqvist 2024-04-12 Alex Riley You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 From seminars-announce.astro-at-su.se at lists.su.se Fri Feb 16 09:27:56 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 16 Feb 2024 08:27:56 +0000 Subject: [Astronomy seminar] Reminder: Astronomy departmental seminar Friday February 16 at 10:30am - Daniel Siegel (University of Greifswald) Message-ID: Dear all, This is a reminder of the weekly SU astronomy departmental seminar that will take place in about 63 minutes, at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). As usual, we encourage you to attend in person if possible. ___________________ Speaker: Daniel Siegel (University of Greifswald) Title: Nucleosynthesis and electromagnetic transients from neutron-star mergers and rare types of core-collapse supernovae Event: https://indico.fysik.su.se/e/daniel_siegel Abstract: Multi-messenger astronomy sheds light on the astrophysics of black holes and neutron stars and also enables unique probes of fundamental physics. I will discuss recent results on how the mergers of neutron stars as well as other explosive systems, such as the death of massive, rotating stars, give rise to the formation of heavy elements in the universe. In particular, I will discuss recent results at the interface of numerical relativity, relativistic astrophysics, and nuclear astrophysics, and highlight how multi-messenger astronomy may lead to the answer of a 70-year old fundamental question in physics: How does the Universe create the heaviest elements? ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-02-21 Johan Richard (**Seminar on WEDNESDAY**) 2024-03-01 ** No seminar ** 2024-03-08 Jack William Edmund Mallinson 2024-03-15 Joe Lewis 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** 2024-04-05 Simon Ringqvist 2024-04-12 Alex Riley You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Feb 19 09:52:22 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 19 Feb 2024 08:52:22 +0000 Subject: [Astronomy seminar] Astronomy departmental seminar Wednesday February 21 at 10:00 am - Johan Richard Message-ID: Dear all, The next SU astronomy departmental seminar will take place on Wednesday February 21 at 10:00 am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). After the seminar, we will have a Q&A session about the BlueMUSE instrument with the speaker. ___________________ Speaker: JOHAN RICHARD (University of Lyon) Title: Integral Field Spectroscopy in lensing cluster fields - recent results and prospects of the BlueMUSE instrument. Event: https://indico.fysik.su.se/event/8574/ Abstract: The advent of panoramic integral field spectrographs, such as the MUSE (Multi Unit Spectroscopic Explorer) instrument on the Very Large Telescope, has offered the new capability to obtain efficient and massive spectroscopy in very crowded fields. When combined with massive clusters serving as gravitational telescopes, it has truly improved the modelling of cluster mass distribution and extended our view of distant background galaxies. I will present some of the main results obtained with MUSE on a large sample of galaxy clusters, focusing in particular on the lensed Lyman-alpha emitters and their circumgalactic medium. The excellent performance of MUSE calls for the development of additional panoramic integral field spectrographs. I will describe the current development of BlueMUSE, a blue-optimised, medium spectral resolution, panoramic integral field spectrograph under development for the Very Large Telescope. With an optimised transmission down to 350 nm, a large FoV (at least 1 arcmin2) and a higher spectral resolution (λ/Δλ ~ 4000) compared to its predecessor, BlueMUSE will open up a new range of galactic and extragalactic science cases allowed by its specific capabilities. Among these science cases I will focus on the prospects of BlueMUSE in lensing cluster fields. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-03-01 ** No seminar ** 2024-03-08 TBA 2024-03-15 Joe Lewis 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** 2024-04-05 Simon Ringqvist 2024-04-12 Alex Riley You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Wed Feb 21 08:37:28 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Wed, 21 Feb 2024 07:37:28 +0000 Subject: [Astronomy seminar] Astronomy departmental seminar Wednesday February 21 at 10:00 am - Johan Richard In-Reply-To: <2e8bde43-b63f-4661-a646-2bc32dfe0d6c@astro.su.se> References: , <2e8bde43-b63f-4661-a646-2bc32dfe0d6c@astro.su.se> Message-ID: Dear all, This is a reminder that the next SU astronomy departmental seminar will take place today at 10:00 am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). After the seminar, we will have a Q&A session about the BlueMUSE instrument with the speaker. ___________________ Speaker: JOHAN RICHARD (University of Lyon) Title: Integral Field Spectroscopy in lensing cluster fields - recent results and prospects of the BlueMUSE instrument. Event: https://indico.fysik.su.se/e/johan_richard Abstract: The advent of panoramic integral field spectrographs, such as the MUSE (Multi Unit Spectroscopic Explorer) instrument on the Very Large Telescope, has offered the new capability to obtain efficient and massive spectroscopy in very crowded fields. When combined with massive clusters serving as gravitational telescopes, it has truly improved the modelling of cluster mass distribution and extended our view of distant background galaxies. I will present some of the main results obtained with MUSE on a large sample of galaxy clusters, focusing in particular on the lensed Lyman-alpha emitters and their circumgalactic medium. The excellent performance of MUSE calls for the development of additional panoramic integral field spectrographs. I will describe the current development of BlueMUSE, a blue-optimised, medium spectral resolution, panoramic integral field spectrograph under development for the Very Large Telescope. With an optimised transmission down to 350 nm, a large FoV (at least 1 arcmin2) and a higher spectral resolution (λ/Δλ ~ 4000) compared to its predecessor, BlueMUSE will open up a new range of galactic and extragalactic science cases allowed by its specific capabilities. Among these science cases I will focus on the prospects of BlueMUSE in lensing cluster fields. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-03-01 ** No seminar ** 2024-03-08 Jack William Edmund Mallinson 2024-03-15 Joe Lewis 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** 2024-04-05 Simon Ringqvist 2024-04-12 Alex Riley You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 ________________________________ De : Adur Pastor Yabar Envoyé : lundi 19 février 2024 14:53:04 À : Adélaïde Claeyssens Beaupère Objet : Re: Astronomy departmental seminar Wednesday February 21 at 10:00 am - Johan Richard Hi Ade, If you can edit the announcement reminder on Wednesday so that: 1- Event: change https://indico.fysik.su.se/event/8574/ to https://indico.fysik.su.se/e/johan_richard 2- In the upcoming events: 2024-03-08 TBA -> 2024-03-08 Jack William Edmund Mallinson Also, (if you do not want to change it yourself) please let me know that I have to change the time. The indico event and so the calendar event were wrong. Best Adur On 2/19/24 09:52, Adélaïde Claeyssens Beaupère wrote: Dear all, The next SU astronomy departmental seminar will take place on Wednesday February 21 at 10:00 am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). After the seminar, we will have a Q&A session about the BlueMUSE instrument with the speaker. ___________________ Speaker: JOHAN RICHARD (University of Lyon) Title: Integral Field Spectroscopy in lensing cluster fields - recent results and prospects of the BlueMUSE instrument. Event: https://indico.fysik.su.se/event/8574/ Abstract: The advent of panoramic integral field spectrographs, such as the MUSE (Multi Unit Spectroscopic Explorer) instrument on the Very Large Telescope, has offered the new capability to obtain efficient and massive spectroscopy in very crowded fields. When combined with massive clusters serving as gravitational telescopes, it has truly improved the modelling of cluster mass distribution and extended our view of distant background galaxies. I will present some of the main results obtained with MUSE on a large sample of galaxy clusters, focusing in particular on the lensed Lyman-alpha emitters and their circumgalactic medium. The excellent performance of MUSE calls for the development of additional panoramic integral field spectrographs. I will describe the current development of BlueMUSE, a blue-optimised, medium spectral resolution, panoramic integral field spectrograph under development for the Very Large Telescope. With an optimised transmission down to 350 nm, a large FoV (at least 1 arcmin2) and a higher spectral resolution (λ/Δλ ~ 4000) compared to its predecessor, BlueMUSE will open up a new range of galactic and extragalactic science cases allowed by its specific capabilities. Among these science cases I will focus on the prospects of BlueMUSE in lensing cluster fields. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-03-01 ** No seminar ** 2024-03-08 TBA 2024-03-15 Joe Lewis 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** 2024-04-05 Simon Ringqvist 2024-04-12 Alex Riley You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Mar 4 09:43:28 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 4 Mar 2024 09:43:28 +0100 Subject: [Astronomy seminar] Astronomy departmental seminar Friday March 8 at 10:30am - Jack William Edmund Mallinson (Stockholm University) Message-ID: Dear all, The next SU astronomy departmental seminar will take place on Friday March 8 at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Jack William Edmund Mallinson (Stockholm University) Title: Non-LTE effects on titanium in late-type stars. Event: https://indico.fysik.su.se/e/jack_mallinson Abstract: Iron peak elements are vital tracers of Galactic chemical evolution due to their formation in both Type Ia and core-collapse supernovae, and are analysed in large scale surveys such as GALAH and WEAVE. While iron is arguably the most important of them, titanium is also a powerful indicator in Galactic formation history. Its unique behaviour as both an iron peak and alpha element leads it to be one of the most useful elements in stellar spectroscopy and separating Galactic stellar populations. However, despite this interest and the multitude of its lines across all wavelengths, investigations often limit themselves to just its ionised form: Ti II. This is due to the historical inability to correctly model titanium in older, metal-poor stars because of the common assumption of local thermodynamic equilibrium (LTE) that leads to a large ionisation imbalance, |Ti I - Ti II| > 0. By investigating over 70,000 GALAH stars in non-LTE, we determine, for the first time, a large set of accurate non-LTE titanium abundances across a range of stellar parameters. This results in a departure coefficient grid to allow any survey to easily apply non-LTE corrections at little extra computational cost. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-03-15 Joe Lewis 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** 2024-04-05 Simon Ringqvist 2024-04-12 Alex Riley 2024-04-19 Arthur Choplin 2024-04-26 Dominique Petit 2024-05-03 Gang Li You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Mar 8 08:55:20 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 8 Mar 2024 08:55:20 +0100 Subject: [Astronomy seminar] Reminder: Astronomy departmental seminar Friday March 8 at 10:30am - Jack William Edmund Mallinson (Stockholm University) Message-ID: Dear all, This is a reminder of the weekly SU astronomy departmental seminar that will take place in about 95 minutes, at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). As usual, we encourage you to attend in person if possible. ___________________ Speaker: Jack William Edmund Mallinson (Stockholm University) Title: Non-LTE effects on titanium in late-type stars. Event: https://indico.fysik.su.se/e/jack_mallinson Abstract: Iron peak elements are vital tracers of Galactic chemical evolution due to their formation in both Type Ia and core-collapse supernovae, and are analysed in large scale surveys such as GALAH and WEAVE. While iron is arguably the most important of them, titanium is also a powerful indicator in Galactic formation history. Its unique behaviour as both an iron peak and alpha element leads it to be one of the most useful elements in stellar spectroscopy and separating Galactic stellar populations. However, despite this interest and the multitude of its lines across all wavelengths, investigations often limit themselves to just its ionised form: Ti II. This is due to the historical inability to correctly model titanium in older, metal-poor stars because of the common assumption of local thermodynamic equilibrium (LTE) that leads to a large ionisation imbalance, |Ti I - Ti II| > 0. By investigating over 70,000 GALAH stars in non-LTE, we determine, for the first time, a large set of accurate non-LTE titanium abundances across a range of stellar parameters. This results in a departure coefficient grid to allow any survey to easily apply non-LTE corrections at little extra computational cost. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-03-15 Joe Lewis 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** 2024-04-05 Simon Ringqvist 2024-04-12 Alex Riley 2024-04-19 Arthur Choplin 2024-04-26 Dominique Petit 2024-05-03 Gang Li You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 From seminars-announce.astro-at-su.se at lists.su.se Mon Mar 11 11:41:11 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 11 Mar 2024 10:41:11 +0000 Subject: [Astronomy seminar] Astronomy departmental seminar Friday March 15 at 10:30am - Joseph Lewis Message-ID: Dear all, The next SU astronomy departmental seminar will take place on Friday March 15 at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Joseph Lewis (Institut d'Astrophysique de Paris) Title: Understanding the first galaxies Event: https://indico.fysik.su.se/event/8568/ Abstract: We live in exciting times, where great strides are being made in the detection and description of the most distant and early galaxies. Constraining the population of the first galaxies is a key task in understanding galaxy formation, but to this day, much about these primordial objects still eludes us. In this talk, I will present the Reionization of the IGM as a complementary probe of the population of early galaxies. To that end, I will highlight various numerical projects aimed at better understanding the formation of the first galaxies, how they drive Reionization, and advancing the interpretation of galaxy and IGM observations. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** 2024-04-05 Simon Ringqvist 2024-04-12 Alex Riley 2024-04-19 Arthur Choplin 2024-04-26 Dominique Petit 2024-05-03 Gang Li You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Mar 15 09:51:00 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 15 Mar 2024 08:51:00 +0000 Subject: [Astronomy seminar] Reminder : Astronomy departmental seminar Friday March 15 at 10:30am - Joseph Lewis Message-ID: Dear all, This is a reminder of the weekly SU astronomy departmental seminar that will take place today at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom : (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Joseph Lewis (Institut d'Astrophysique de Paris) Title: Understanding the first galaxies Event: https://indico.fysik.su.se/event/8568/ Abstract: We live in exciting times, where great strides are being made in the detection and description of the most distant and early galaxies. Constraining the population of the first galaxies is a key task in understanding galaxy formation, but to this day, much about these primordial objects still eludes us. In this talk, I will present the Reionization of the IGM as a complementary probe of the population of early galaxies. To that end, I will highlight various numerical projects aimed at better understanding the formation of the first galaxies, how they drive Reionization, and advancing the interpretation of galaxy and IGM observations. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-03-22 Khaled Al Moulla 2024-03-29 ** No seminar ** 2024-04-05 Simon Ringqvist 2024-04-12 Alex Riley 2024-04-19 Arthur Choplin 2024-04-26 Dominique Petit 2024-05-03 Gang Li You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644; Password : 593083 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Mar 18 08:32:57 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 18 Mar 2024 08:32:57 +0100 Subject: [Astronomy seminar] Astronomy departmental seminar Friday March 22 at 10:30am - Khaled Al Moulla (University of Geneva) Message-ID: Dear all, The next SU astronomy departmental seminar will take place on Friday March 22 at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Khaled Al Moulla (University of Geneva) Title: Roadblocks to Detect Earth-like Exoplanets: Solar-type Activity in Radial Velocities Event: https://indico.fysik.su.se/e/khaled_al_moulla Abstract: The radial velocity (RV) technique for detecting exoplanets has in recent years been limited in its applicability to search for Earth-mass planets due to their small semi-amplitudes relative to the intrinsic variability of their host stars. In this talk, I will present the signatures of stellar activity in high-resolution optical and near-infrared (NIR) spectral time series of the Sun and solar-type stars, observed with the HARPS, HARPS-N and NIRPS spectrographs. I will talk about a novel, physically motivated method of RV extraction based on the average formation temperature of spectral segments, in order to demonstrate the differential effect of stellar activity signals as a function of photospheric depth, enabling the separation of temperature-dependent stellar activity from constant Keplerian signals. Additionally, I compare the chromaticity of unsigned magnetic field proxies in the optical versus NIR to evaluate their usefulness as activity indicators with which the stellar signals can be mitigated. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-03-29 ** No seminar ** Good Friday 2024-04-05 Simon Ringqvist 2024-04-10 Yutong He (**Seminar on WEDNESDAY**) 2024-04-12 Alex Riley 2024-04-19 Arthur Choplin 2024-04-26 Dominique Petit 2024-05-03 Gang Li 2024-05-08 Ivo (**Seminar on WEDNESDAY**) You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Mar 22 09:42:10 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 22 Mar 2024 08:42:10 +0000 Subject: [Astronomy seminar] Reminder: Astronomy departmental seminar - Khaled Al Moulla Message-ID: Dear all, This is a reminder for the departmental seminar today at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Khaled Al Moulla (University of Geneva) Title: Roadblocks to Detect Earth-like Exoplanets: Solar-type Activity in Radial Velocities Event: https://indico.fysik.su.se/e/khaled_al_moulla Abstract: The radial velocity (RV) technique for detecting exoplanets has in recent years been limited in its applicability to search for Earth-mass planets due to their small semi-amplitudes relative to the intrinsic variability of their host stars. In this talk, I will present the signatures of stellar activity in high-resolution optical and near-infrared (NIR) spectral time series of the Sun and solar-type stars, observed with the HARPS, HARPS-N and NIRPS spectrographs. I will talk about a novel, physically motivated method of RV extraction based on the average formation temperature of spectral segments, in order to demonstrate the differential effect of stellar activity signals as a function of photospheric depth, enabling the separation of temperature-dependent stellar activity from constant Keplerian signals. Additionally, I compare the chromaticity of unsigned magnetic field proxies in the optical versus NIR to evaluate their usefulness as activity indicators with which the stellar signals can be mitigated. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-03-29 ** No seminar ** Good Friday 2024-04-05 Simon Ringqvist 2024-04-10 Yutong He (**Seminar on WEDNESDAY**) 2024-04-12 Alex Riley 2024-04-19 Arthur Choplin 2024-04-26 Dominique Petit 2024-05-03 Gang Li 2024-05-08 Ivo (**Seminar on WEDNESDAY**) You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Tue Apr 2 10:13:05 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 2 Apr 2024 08:13:05 +0000 Subject: [Astronomy seminar] Astronomy departmental seminar Friday April 05 at 10:30am - Simon Ringqvist (Stockholm University) Message-ID: Dear all, The next SU astronomy departmental seminar will take place on Friday April 5 at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Simon Ringqvist (Stockholm University) Title: Unveiling the Accretion Process at Planetary Masses Event: https://indico.fysik.su.se/e/simon_ringqvist Abstract: Our understanding of the magnetospheric accretion process in young stars has advanced significantly in the last few decades. It is only very recently however, that we have been able to also study accreting planetary mass companions. I will defend my PhD thesis on this topic, on 2024-05-27, and today’s talk will therefore provide a scientific overview of how we can study these fascinating objects with spectroscopy and atmospheric variability studies. Do giant planets accrete matter as stars do, by funneling it along magnetic field lines, or are their magnetic fields too weak? How long can the accretion phase actually last in these objects? Evidence shows that it does not always cease after a few Myr, especially not in Delorme 1 (AB)b where it seemingly continued for 40 Myr. Concluding the talk will be a brief overview of how upcoming ESO pathfinder instruments will drastically improve our ability to detect planetary mass accretors. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-04-10 Yutong He (**Seminar on WEDNESDAY**) 2024-04-12 Alex Riley 2024-04-19 Arthur Choplin 2024-04-26 Dominique Petit 2024-05-03 Gang Li 2024-05-08 Ivo (**Seminar on WEDNESDAY**) 2024-05-10 Ray Jayawardhana (**Seminar on KLÄMDAG**) 2024-05-14 Gayathri Viswanath (**Seminar on TUSDAY**) You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Apr 5 09:04:26 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 5 Apr 2024 09:04:26 +0200 Subject: [Astronomy seminar] Reminder: Astronomy departmental seminar Friday April 05 at 10:30am - Simon Ringqvist (Stockholm University) Message-ID: Dear all, This is a reminder of the weekly SU astronomy departmental seminar that will take place in about 86 minutes, at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). As usual, we encourage you to attend in person if possible. ___________________ Speaker: Simon Ringqvist (Stockholm University) Title: Unveiling the Accretion Process at Planetary Masses Event: https://indico.fysik.su.se/e/simon_ringqvist Abstract: Our understanding of the magnetospheric accretion process in young stars has advanced significantly in the last few decades. It is only very recently however, that we have been able to also study accreting planetary mass companions. I will defend my PhD thesis on this topic, on 2024-05-27, and today’s talk will therefore provide a scientific overview of how we can study these fascinating objects with spectroscopy and atmospheric variability studies. Do giant planets accrete matter as stars do, by funneling it along magnetic field lines, or are their magnetic fields too weak? How long can the accretion phase actually last in these objects? Evidence shows that it does not always cease after a few Myr, especially not in Delorme 1 (AB)b where it seemingly continued for 40 Myr. Concluding the talk will be a brief overview of how upcoming ESO pathfinder instruments will drastically improve our ability to detect planetary mass accretors. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-04-10 Yutong He (**Seminar on WEDNESDAY**) 2024-04-12 Alex Riley 2024-04-19 Arthur Choplin 2024-04-26 Dominique Petit 2024-05-03 Gang Li 2024-05-08 Ivo (**Seminar on WEDNESDAY**) 2024-05-10 Ray Jayawardhana (**Seminar on KLÄMDAG**) 2024-05-14 Gayathri Viswanath (**Seminar on TUSDAY**) You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644 From seminars-announce.astro-at-su.se at lists.su.se Mon Apr 8 09:35:19 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 8 Apr 2024 09:35:19 +0200 Subject: [Astronomy seminar] Astronomy departmental seminar Wednesday April 10 at 10:30am - Yutong He (Stockholm University) Message-ID: Dear all, The next SU astronomy departmental seminar will take place on Wednesday April 10 at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Yutong He (Stockholm University) Title: Cosmological gravitational waves and their interaction with large-scale magnetic fields Event: https://indico.fysik.su.se/e/yutong_he Abstract: Gravitational waves (GWs) and magnetic fields are two essential topics of cosmology. They interact in different ways in the early and late Universe. In the radiation era preceding the Cosmic Microwave Background (CMB), stochastic GW backgrounds (SGWBs) can be produced by magnetohydrodynamic (MHD) turbulence after the phase transitions at the electroweak (EW) and quantum chromodynamic (QCD) scales. We develop a general framework to study the SGWB spectrum in general relativity (GR) and modified gravity (MG) theories, with massive gravity and scalar-tensor theories as two examples. We then apply the framework to the MHD-GW system at the EW and QCD phase transitions to provide concrete constraints on effective MG parameters in light of ongoing and upcoming GW experiments, such as the Laser Interferometer Space Antenna (LISA) in the mHz band, and various pulsar timing array (PTA) collaborations in the nHz band. In the post-CMB Universe, high-frequency GWs (HFGWs) propagating through large-scale magnetic fields have a probability of converting into photons of the same frequency. This conversion contributes to the distortion of blackbody CMB. Using the reported excess radio signals over the CMB, we place upper limits on the HFGW amplitude. We also forecast the capability of the Square Kilometer Array (SKA) and proposed future CMB surveys to significantly tighten the existing HFGW upper bounds in the MHz to THz frequency bands. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-04-12 Alex Riley 2024-04-19 Arthur Choplin 2024-04-26 Dominique Petit 2024-05-03 Gang Li 2024-05-08 Ivo (**Seminar on WEDNESDAY**) 2024-05-10 Ray Jayawardhana (**Seminar on KLÄMDAG**) 2024-05-14 Gayathri Viswanath (**Seminar on TUSDAY**) 2024-05-17 Elena Khomenko You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Apr 8 11:09:59 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 8 Apr 2024 11:09:59 +0200 Subject: [Astronomy seminar] Astronomy departmental seminar Friday April 12 at 10:30am - Alex Riley (Durham University) Message-ID: Dear all, This week we will have a second SU astronomy departmental seminar that will take place on Friday April 12 at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Alex Riley (Durham University) Title: Revealing the ghosts of the faintest galaxies near the Milky Way Event: https://indico.fysik.su.se/e/alex_riley Abstract: Recent large photometric, astrometric, and spectroscopic surveys have begun to uncover and characterise stellar streams and other faint, extra-tidal debris around the Milky Way. In parallel, cosmological simulations have reached sufficient resolution to enable studies of disrupting galaxies around Milky Way-mass hosts. In this talk, I will present predictions from cosmological simulations, semi-analytic modelling, and mock observations of the tangled web of galaxies unravelling about the Milky Way and its fainter satellites. Upcoming surveys detecting these faint tidal features (or not) will unlock new tests of hierarchical galaxy formation at the smallest scales. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-04-19 Arthur Choplin 2024-04-26 Dominique Petit 2024-05-03 Gang Li 2024-05-08 Ivo (**Seminar on WEDNESDAY**) 2024-05-10 Ray Jayawardhana (**Seminar on KLÄMDAG**) 2024-05-14 Gayathri Viswanath (**Seminar on TUSDAY**) 2024-05-17 Elena Khomenko 2024-05-24 Matteo Messa You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Apr 15 19:47:28 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 15 Apr 2024 17:47:28 +0000 Subject: [Astronomy seminar] Astronomy departmental seminar Friday April 19 at 10:30am - Arthur Choplin (ONLINE ONLY) Message-ID: Dear all, The next SU astronomy departmental seminar will take place on Friday April 19 at 10:30am only on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Arthur Choplin (Université libre de Bruxelles, Belgium) Title: The intermediate neutron capture process Event: https://indico.fysik.su.se/event/8644/ Abstract: Despite considerable progresses during the last decades, the origin of the elements heavier than iron is not yet fully understood. In addition to the slow (s) and rapid (r) neutron capture processes, an intermediate neutron capture process (i-process) is thought to exist at neutron densities intermediate between the s- and r-processes. The astrophysical site(s) hosting the i-process is (are) actively debated. After reviewing the current status of the i-process, I will focus on the development of the i-process in asymptotic giant branch (AGB) stellar models, computed with the stellar evolution code STAREVOL. I will highlight the unique chemical fingerprint of the i-process, identify key reaction rates and compare model predictions with observations of chemically peculiar stars. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-04-26 Dominique Petit 2024-05-03 Gang Li 2024-05-08 Ivo (**Seminar on WEDNESDAY**) 2024-05-10 Ray Jayawardhana (**Seminar on KLÄMDAG**) 2024-05-14 Gayathri Viswanath (**Seminar on TUSDAY**) 2024-05-17 Elena Khomenko 2024-05-24 Matteo Messa You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Apr 22 11:30:39 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 22 Apr 2024 09:30:39 +0000 Subject: [Astronomy seminar] Astronomy departmental seminar Friday April 26 at 10:30am - Dominique Petit (UNIGE) Message-ID: Dear all, The next SU astronomy departmental seminar will take place on Friday April 26 at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Dominique Petit (UNIGE) Title: Understanding exoplanets: characterisation in the optical and the infrared Event: https://indico.fysik.su.se/e/dominique_petit Abstract: The characterisation of exoplanet atmospheres is the best way to understand them and learn about their environments and formation. The majority of this work has so far been done in the optical, but the infrared also offers a host of information. In this regard, JWST has opened a treasure trove on exoplanet atmospheres through both direct detections and indirect transit observations. In this talk I will discuss not only what we can do with JWST, but also the complementary nature of ground-based optical and infrared observations. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-05-03 Gang Li 2024-05-08 Ivo (**Seminar on WEDNESDAY**) 2024-05-10 Ray Jayawardhana (**Seminar on KLÄMDAG**) 2024-05-14 Gayathri Viswanath (**Seminar on TUESDAY**) 2024-05-17 Elena Khomenko 2024-05-24 Matteo Messa 2024-05-31 Oleg Kochukhov (**Last seminar before summer break**) You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Apr 26 10:05:29 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 26 Apr 2024 08:05:29 +0000 Subject: [Astronomy seminar] Reminder: Astronomy departmental seminar at 10:30am - Dominique Petit (UNIGE) Message-ID: Dear all, This is a reminder for the SU astronomy departmental seminar today at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Dominique Petit (UNIGE) Title: Understanding exoplanets: characterisation in the optical and the infrared Event: https://indico.fysik.su.se/e/dominique_petit Abstract: The characterisation of exoplanet atmospheres is the best way to understand them and learn about their environments and formation. The majority of this work has so far been done in the optical, but the infrared also offers a host of information. In this regard, JWST has opened a treasure trove on exoplanet atmospheres through both direct detections and indirect transit observations. In this talk I will discuss not only what we can do with JWST, but also the complementary nature of ground-based optical and infrared observations. ___________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-05-03 Gang Li 2024-05-08 Ivo (**Seminar on WEDNESDAY**) 2024-05-10 Ray Jayawardhana (**Seminar on KLÄMDAG**) 2024-05-14 Gayathri Viswanath (**Seminar on TUESDAY**) 2024-05-17 Elena Khomenko 2024-05-24 Matteo Messa 2024-05-31 Oleg Kochukhov (**Last seminar before summer break**) You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Tue Apr 30 10:38:08 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 30 Apr 2024 08:38:08 +0000 Subject: [Astronomy seminar] Astronomy departmental seminar Friday May 3 at 10:30am - Gang Li (KU Leuven) Message-ID: Dear all, The next SU astronomy departmental seminar will take place on Friday May 3 at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Gang Li (KU Leuven) Title: Asteroseismic observations of rapidly rotating stars in open clusters Event: https://indico.fysik.su.se/event/8576/ Abstract: Asteroseismology and cluster research can mutually benefit each other, yet synergistic studies between the two are still limited. On one hand, we can measure the temperature, luminosity, and mass of cluster member stars with high precision, which allows for more efficient constraints on asteroseismology models compared to single stars. On the other hand, asteroseismic investigation into the interiors of stars can also address questions about cluster evolution, such as how rotation and internal element transport affect stellar evolution, as well as the formation of extended main-sequence turn-off and blue stragglers. We collected photometric data from four open clusters in the Kepler field and two open clusters within the TESS continuous viewing zones in both the northern and southern hemispheres, discovering a significant number of variable stars. We pay special attention to A- to F-type stars, as their internal oscillations reveal the physical conditions at the edge of their convective cores. We found that young A-type main sequence stars can rotate at up to half the breakup rate, while the rotation rate of older A-type main sequence stars slows down with age. The variable stars in these clusters provide excellent samples for further exploration of angular momentum transfer and internal element mixing. _________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-05-08 Ivo (**Seminar on WEDNESDAY**) 2024-05-10 Ray Jayawardhana (**Seminar on KLÄMDAG**) 2024-05-14 Gayathri Viswanath (**Seminar on TUESDAY**) 2024-05-17 Elena Khomenko 2024-05-24 Matteo Messa 2024-05-31 Oleg Kochukhov (**Last seminar before summer break**) You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri May 3 09:49:55 2024 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 3 May 2024 07:49:55 +0000 Subject: [Astronomy seminar] Reminder: Astronomy department seminar today at 10:30 Message-ID: Dear all, This is a reminder for the SU astronomy departmental seminar today at 10:30am in room FC61 (AlbaNova building, 6th floor) and on zoom (https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09). ___________________ Speaker: Gang Li (KU Leuven) Title: Asteroseismic observations of rapidly rotating stars in open clusters Event: https://indico.fysik.su.se/event/8576/ Abstract: Asteroseismology and cluster research can mutually benefit each other, yet synergistic studies between the two are still limited. On one hand, we can measure the temperature, luminosity, and mass of cluster member stars with high precision, which allows for more efficient constraints on asteroseismology models compared to single stars. On the other hand, asteroseismic investigation into the interiors of stars can also address questions about cluster evolution, such as how rotation and internal element transport affect stellar evolution, as well as the formation of extended main-sequence turn-off and blue stragglers. We collected photometric data from four open clusters in the Kepler field and two open clusters within the TESS continuous viewing zones in both the northern and southern hemispheres, discovering a significant number of variable stars. We pay special attention to A- to F-type stars, as their internal oscillations reveal the physical conditions at the edge of their convective cores. We found that young A-type main sequence stars can rotate at up to half the breakup rate, while the rotation rate of older A-type main sequence stars slows down with age. The variable stars in these clusters provide excellent samples for further exploration of angular momentum transfer and internal element mixing. _________________ We look forward to seeing many of you there. Thanks! Adur, Adélaïde, and Sanja Upcoming Events: 2024-05-08 Ivo (**Seminar on WEDNESDAY**) 2024-05-10 Ray Jayawardhana (**Seminar on KLÄMDAG**) 2024-05-14 Gayathri Viswanath (**Seminar on TUESDAY**) 2024-05-17 Elena Khomenko 2024-05-24 Matteo Messa 2024-05-31 Oleg Kochukhov (**Last seminar before summer break**) You can subscribe to the seminars calendar in: https://ttt.astro.su.se/ical/astro-seminars.ics (Please note that calendar can be subject to updates) ___________________ Join Zoom Meeting: https://stockholmuniversity.zoom.us/j/62211269644?pwd=K0J2eVVMa3pTa1JVN2lyRUJPR3Rjdz09 Meeting ID: 622 1126 9644 -------------- next part -------------- An HTML attachment was scrubbed... URL: