From seminars-announce.astro-at-su.se at lists.su.se Mon Jan 15 11:48:10 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 15 Jan 2018 10:48:10 +0000 Subject: [Astronomy seminar] First astronomy seminar of the year, Friday 19/01 @ 10:30 in FC 61 Message-ID: Dear all, we welcome you to the first astronomy seminar of 2018, which will take place the 19th of January at 10:30 in FC 61 (6th floor). Our speaker will be Dr. Francesco Taddia, from Stockholm University. Kind regards, Jorrit & Angela Title: Core-collapse supernovae and their progenitors Abstract: In the recent years we studied a number of core-collapse supernovae (SNe) from different surveys. We focused on stripped-envelope SNe (Type Ib/c and IIb), circumstellar-interacting SNe (Type IIn, Ibn, Ia-CSM) and peculiar Type II SNe (1987A-like), from the intermediate Palomar Transient Factory, from the Carnegie Supernovae Project and from the Sloan Digital Sky Survey. We investigated single events, large SN samples, and the host galaxies of specific SN groups, aiming to determine the nature of the SN progenitor stars. Here we review our main results, in particular those concerning the debate between single and binary progenitor stars of Type Ib/c, the multi-channel progenitor scenario for SNe IIn and the variety of 1987A-like progenitor-star radii. We also review the open questions concerning the SN type <-> progenitor-star map and we discuss how we can address them using the new Zwicky Transient Facily survey. ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- From seminars-announce.astro-at-su.se at lists.su.se Fri Jan 19 08:38:19 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 19 Jan 2018 08:38:19 +0100 Subject: [Astronomy seminar] Reminder: First astronomy seminar of the year, Friday 19/01 @ 10:30 in FC 61 In-Reply-To: <90DF020E-6C9E-468B-A3AA-0382DA95707E@astro.su.se> References: <90DF020E-6C9E-468B-A3AA-0382DA95707E@astro.su.se> Message-ID: Dear all, This is a kind reminder of today’s seminar! Welcome > On 15 Jan 2018, at 11:48, Angela Adamo wrote: > > Dear all, > we welcome you to the first astronomy seminar of 2018, which will take place the 19th of January at 10:30 in FC 61 (6th floor). > Our speaker will be Dr. Francesco Taddia, from Stockholm University. > > Kind regards, > Jorrit & Angela > > > Title: Core-collapse supernovae and their progenitors > > Abstract: > In the recent years we studied a number of core-collapse supernovae (SNe) > from different surveys. We focused on stripped-envelope SNe (Type Ib/c and IIb), circumstellar-interacting > SNe (Type IIn, Ibn, Ia-CSM) and peculiar Type II SNe (1987A-like), > from the intermediate Palomar Transient Factory, from the Carnegie Supernovae Project > and from the Sloan Digital Sky Survey. We investigated single events, large SN samples, > and the host galaxies of specific SN groups, aiming to determine the nature of the SN progenitor stars. > Here we review our main results, in particular those concerning the debate between single > and binary progenitor stars of Type Ib/c, the multi-channel progenitor scenario for SNe IIn and > the variety of 1987A-like progenitor-star radii. We also review the open questions concerning the > SN type <-> progenitor-star map and we discuss how we can address them using > the new Zwicky Transient Facily survey. > > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > From seminars-announce.astro-at-su.se at lists.su.se Tue Jan 23 09:24:05 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 23 Jan 2018 08:24:05 +0000 Subject: [Astronomy seminar] Astronomy seminar Friday 26/01 @ 10:30 in FC 61 In-Reply-To: <90DF020E-6C9E-468B-A3AA-0382DA95707E@astro.su.se> References: <90DF020E-6C9E-468B-A3AA-0382DA95707E@astro.su.se> Message-ID: Dear all, this week astro seminar will be given by prof. and ApJ ed. Giovanni Carraro from Padua University. The seminar will take place the 26th of January at 10:30 in FC 61 (6th floor). Title and abstract are attached. Kind regards, Jorrit and Angela TITLE: Final products of stellar evolution in high metallicity environments and the UV upturn in Elliptical Galaxies ABSTRACT: I will review the properties of the old, metal rich, massive open cluster NGC 6791. First of all I will show how its properties help us to better understand the origin of the UV upturn in the spectral energy distribution of massive local volume ellipticals. Second, I will discuss the possible origin of this unique object in the framework of the Milky Way chemical and dynamical evolution. ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- From seminars-announce.astro-at-su.se at lists.su.se Fri Jan 26 08:26:09 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 26 Jan 2018 08:26:09 +0100 Subject: [Astronomy seminar] Reminder: Astronomy seminar Friday 26/01 @ 10:30 in FC 61 In-Reply-To: References: <90DF020E-6C9E-468B-A3AA-0382DA95707E@astro.su.se> Message-ID: A kind reminder of today seminar. Welcome, Angela > On 23 Jan 2018, at 09:24, Angela Adamo wrote: > > Dear all, > this week astro seminar will be given by prof. and ApJ ed. Giovanni Carraro from Padua University. > The seminar will take place the 26th of January at 10:30 in FC 61 (6th floor). > Title and abstract are attached. > > Kind regards, > Jorrit and Angela > > TITLE: Final products of stellar evolution in high metallicity environments and the UV upturn in Elliptical Galaxies > > ABSTRACT: I will review the properties of the old, metal rich, massive open cluster NGC 6791. > First of all I will show how its properties help us to better understand the origin of the UV upturn in the spectral energy distribution of massive local volume ellipticals. > Second, I will discuss the possible origin of this unique object in the framework of the Milky Way chemical and dynamical evolution. > > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > From seminars-announce.astro-at-su.se at lists.su.se Tue Jan 30 14:31:39 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 30 Jan 2018 14:31:39 +0100 Subject: [Astronomy seminar] Astronomy seminar Friday 02/02 @ 10:30 in FC 61 Message-ID: Dear all, This week's astronomy seminar will be given by dr. Lucia Kleint from the Kiepenheuer Institute for Solar Physics, Germany The seminar will take place Friday, Feb 2 at 10:30 in FC 61 (6th floor). Title and abstract are attached. With kind regards, Jorrit and Angela TITLE: The Dynamics and Magnetism of Solar Flares ABSTRACT: Solar flares are the most energetic events on the Sun, releasing energy equivalent to billions of atomic bombs within minutes. Yet the relatively basic question “how is flare energy dissipated?” is still open. It is suspected that a large fraction of the energy of the accelerated particles is converted into continuum and line emission, heating, kinetic energy (mass motion), and changes of the magnetic field structure. I will show recent results obtained from high-resolution flare observations, focusing on the progress in understanding the physics of the solar atmosphere during flares. Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Tue Jan 30 16:26:09 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 30 Jan 2018 16:26:09 +0100 Subject: [Astronomy seminar] Astronomy seminar Friday 02/02 @ 10:30 in FC 61 Message-ID: Dear all, This week's astronomy seminar will be given by dr. Lucia Kleint from the Kiepenheuer Institute for Solar Physics, Germany The seminar will take place Friday, Feb 2 at 10:30 in FC 61 (6th floor). Title and abstract are attached. With kind regards, Jorrit and Angela TITLE: The Dynamics and Magnetism of Solar Flares ABSTRACT: Solar flares are the most energetic events on the Sun, releasing energy equivalent to billions of atomic bombs within minutes. Yet the relatively basic question “how is flare energy dissipated?” is still open. It is suspected that a large fraction of the energy of the accelerated particles is converted into continuum and line emission, heating, kinetic energy (mass motion), and changes of the magnetic field structure. I will show recent results obtained from high-resolution flare observations, focusing on the progress in understanding the physics of the solar atmosphere during flares. Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Fri Feb 2 08:18:52 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 2 Feb 2018 08:18:52 +0100 Subject: [Astronomy seminar] REMINDER: Astronomy seminar today 02/02 @ 10:30 in FC 61 Message-ID: Dear all, This week's astronomy seminar will be given by dr. Lucia Kleint from the Kiepenheuer Institute for Solar Physics, Germany The seminar will take place today, Feb 2 at 10:30 in FC 61 (6th floor). Title and abstract are attached. With kind regards, Jorrit and Angela TITLE: The Dynamics and Magnetism of Solar Flares ABSTRACT: Solar flares are the most energetic events on the Sun, releasing energy equivalent to billions of atomic bombs within minutes. Yet the relatively basic question “how is flare energy dissipated?” is still open. It is suspected that a large fraction of the energy of the accelerated particles is converted into continuum and line emission, heating, kinetic energy (mass motion), and changes of the magnetic field structure. I will show recent results obtained from high-resolution flare observations, focusing on the progress in understanding the physics of the solar atmosphere during flares. Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Tue Feb 6 20:34:40 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 6 Feb 2018 19:34:40 +0000 Subject: [Astronomy seminar] Next astro seminar Friday 09/02 at 10:30 in FC61 Message-ID: Dear all, welcome to this week seminar on Friday 09/02 at 10:30 in FC61. The speaker will be Dr. Jouni Kainulainen from Chalmers university. Because we haven’t yet a working online agenda I include here below a list of the upcoming seminars. Kind regards, Angela Title: The Golden Age of Star Formation Physics Abstract: Understanding star formation in the interstellar medium (ISM) is one of the central themes in explaining the assembly of the universe as we know it. Despite its importance, the holistic picture of star formation remains fundamentally lacking, and as a consequence, the most often-used star formation laws today are empirical relations—not models based on gas physics. However, the upcoming decade will be the Golden Age to take a step forward. Recently, key advances have been made in our ability to probe the physical processes relevant for star formation, covering a wide range of relevant scales from macrophysics to microphysics of star formation. These advances are so far virtually unexploited; the upcoming decade will harness their potential and witness their impact on star formation laws. I will describe how the recent advances are expected to enable progress in developing physically-motivated, observationally-constrained star formation laws. I summarise our recent contributions in this field, especially in studying the processes that govern the ISM structure and form the link between the ISM and star formation. I will also introduce our on-going survey program that aims at a Galaxy-scale characterisation of the internal structure of molecular clouds, providing a Legacy database for statistical studies of molecular cloud structure and star formation. 16/02 -- 23/02 Elena D’onghia 02/03 Sportlov 09/03 Sune Toft 16/03 Finoguenov Alexis 23/03 Florent Renaud 30/03 Easter 06/04 Nina Almgren 13/04 Jim Dale 20/04 Brent Groves 27/04 Mickaël Bonnefoy 04/05 Sara Bladh 11/05 Klämdag 18/05 Anastasia Fialkov 25/05 Carolina Robustini 01/06 -- 08/06 Esha Kundu 15/06 Matteo Messa 22/06 Midsommar 29/06 Summer break ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Wed Feb 7 10:41:16 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Wed, 7 Feb 2018 09:41:16 +0000 Subject: [Astronomy seminar] Next astro seminar Friday 09/02 at 10:30 in FC61 In-Reply-To: References: Message-ID: ++++++++++++++++++++ apologies if you have received this email twice, there have been some technical problems ++++++++++++++++++++ Dear all, welcome to this week seminar on Friday 09/02 at 10:30 in FC61. The speaker will be Dr. Jouni Kainulainen from Chalmers university. Because we haven’t yet a working online agenda I include here below a list of the upcoming seminars. Kind regards, Angela Title: The Golden Age of Star Formation Physics Abstract: Understanding star formation in the interstellar medium (ISM) is one of the central themes in explaining the assembly of the universe as we know it. Despite its importance, the holistic picture of star formation remains fundamentally lacking, and as a consequence, the most often-used star formation laws today are empirical relations—not models based on gas physics. However, the upcoming decade will be the Golden Age to take a step forward. Recently, key advances have been made in our ability to probe the physical processes relevant for star formation, covering a wide range of relevant scales from macrophysics to microphysics of star formation. These advances are so far virtually unexploited; the upcoming decade will harness their potential and witness their impact on star formation laws. I will describe how the recent advances are expected to enable progress in developing physically-motivated, observationally-constrained star formation laws. I summarise our recent contributions in this field, especially in studying the processes that govern the ISM structure and form the link between the ISM and star formation. I will also introduce our on-going survey program that aims at a Galaxy-scale characterisation of the internal structure of molecular clouds, providing a Legacy database for statistical studies of molecular cloud structure and star formation. 16/02 -- 23/02 Elena D’onghia 02/03 Sportlov 09/03 Sune Toft 16/03 Finoguenov Alexis 23/03 Florent Renaud 30/03 Easter break 06/04 Nina Almgren 13/04 Jim Dale 20/04 Brent Groves 27/04 Mickaël Bonnefoy 04/05 Sara Bladh 11/05 Klämdag 18/05 Anastasia Fialkov 25/05 Carolina Robustini 01/06 -- 08/06 Esha Kundu 15/06 Matteo Messa 22/06 Midsommar 29/06 Summer break ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- From seminars-announce.astro-at-su.se at lists.su.se Fri Feb 9 08:30:37 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 9 Feb 2018 08:30:37 +0100 Subject: [Astronomy seminar] Reminder: astro seminar Today at 10:30 in FC61 In-Reply-To: References: Message-ID: Welcome! Angela > On 7 Feb 2018, at 10:41, Angela Adamo wrote: > > ++++++++++++++++++++ > apologies if you have received this email twice, there have been some technical problems > ++++++++++++++++++++ > > Dear all, > welcome to this week seminar on Friday 09/02 at 10:30 in FC61. > The speaker will be Dr. Jouni Kainulainen from Chalmers university. > Because we haven’t yet a working online agenda I include here below a list of the upcoming seminars. > > Kind regards, > Angela > > Title: > The Golden Age of Star Formation Physics > > Abstract: > Understanding star formation in the interstellar medium (ISM) is one of the central themes in explaining the assembly of the universe as we know it. Despite its importance, the holistic picture of star formation remains fundamentally lacking, and as a consequence, the most often-used star formation laws today are empirical relations—not models based on gas physics. However, the upcoming decade will be the Golden Age to take a step forward. Recently, key advances have been made in our ability to probe the physical processes relevant for star formation, covering a wide range of relevant scales from macrophysics to microphysics of star formation. These advances are so far virtually unexploited; the upcoming decade will harness their potential and witness their impact on star formation laws. I will describe how the recent advances are expected to enable progress in developing physically-motivated, observationally-constrained star formation laws. I summarise our recent contributions in this field, especially in studying the processes that govern the ISM structure and form the link between the ISM and star formation. I will also introduce our on-going survey program that aims at a Galaxy-scale characterisation of the internal structure of molecular clouds, providing a Legacy database for statistical studies of molecular cloud structure and star formation. > > > 16/02 -- > 23/02 Elena D’onghia > 02/03 Sportlov > 09/03 Sune Toft > 16/03 Finoguenov Alexis > 23/03 Florent Renaud > 30/03 Easter break > 06/04 Nina Almgren > 13/04 Jim Dale > 20/04 Brent Groves > 27/04 Mickaël Bonnefoy > 04/05 Sara Bladh > 11/05 Klämdag > 18/05 Anastasia Fialkov > 25/05 Carolina Robustini > 01/06 -- > 08/06 Esha Kundu > 15/06 Matteo Messa > 22/06 Midsommar > 29/06 Summer break > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > > From seminars-announce.astro-at-su.se at lists.su.se Wed Feb 14 18:23:57 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Wed, 14 Feb 2018 18:23:57 +0100 Subject: [Astronomy seminar] No Astronomy seminar this week Message-ID: Dear all, This week there will be no Friday seminar. Best regards, Angela & Jorrit Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Thu Feb 15 16:42:40 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Thu, 15 Feb 2018 16:42:40 +0100 Subject: [Astronomy seminar] mistake: there is an astronomy seminar tomorrow 16/2 at 10.30 in FC61 Message-ID: Dear all, We made a mistake, and there is actually an astronomy seminar tomorrow at 10.30 in FC61 Speaker: Dr. Finoguenov Alexis from Helsinki University The infall of X-ray groups onto massive clusters Galaxy clusters are expected to form hierarchically in a LCDM universe, growing primarily through mergers with lower mass clusters and the continual accretion of group-mass halos. Galaxy clusters assemble late, doubling their masses since z~0.5, and so the outer regions of clusters should be replete with infalling group-mass systems. We present an XMM-Newton survey to search for X-ray groups in the infall regions of 23 massive galaxy clusters at z~0.2, identifying 39 X-ray groups that have been spectroscopically confirmed to lie at the cluster redshift. These groups have mass estimates in the range 2x10^13-7x10^14Msun, and group-to-cluster mass ratios as low as 0.02. The comoving number density of X-ray groups in the infall regions is ~25x higher than that seen for isolated X-ray groups from the XXL survey. The average mass per cluster contained within these X-ray groups is 2.2x10^14Msun, or 19% of the mass within the primary cluster itself. We estimate that ~10^15Msun clusters increase their masses by 16% between z=0.223 and the present day due to the accretion of groups with M200>10^13.2Msun. This represents about half of the expected mass growth rate of clusters at these late epochs. The other half is likely to come from smooth accretion of matter not bound in halos. The mass function of the infalling X-ray groups appears significantly top-heavy with respect to that of field X-ray systems, consistent with expectations from numerical simulations, and the basic consequences of collapsed massive dark matter halos being biased tracers of the underlying large-scale density distribution. Sorry for the confusion & best regards, Jorrit and Angela Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Feb 16 09:36:35 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 16 Feb 2018 09:36:35 +0100 Subject: [Astronomy seminar] Reminder: there is an astronomy seminar today 16/2 at 10.30 in FC61 In-Reply-To: <82F14B28-ECB3-46CC-8BEC-D2BB6D84091A@astro.su.se> References: <82F14B28-ECB3-46CC-8BEC-D2BB6D84091A@astro.su.se> Message-ID: A kind reminder! Angela & Jorrit > On 15 Feb 2018, at 16:42, Jorrit Leenaarts wrote: > > Dear all, > > We made a mistake, and there is actually an astronomy seminar tomorrow at 10.30 in FC61 > > Speaker: Dr. Finoguenov Alexis from Helsinki University > > The infall of X-ray groups onto massive clusters > > Galaxy clusters are expected to form hierarchically in a LCDM universe, growing primarily through mergers with lower mass clusters and the continual accretion of group-mass halos. Galaxy clusters assemble late, doubling their masses since z~0.5, and so the outer regions of clusters should be replete with infalling group-mass systems. We present an XMM-Newton survey to search for X-ray groups in the infall regions of 23 massive galaxy clusters at z~0.2, identifying 39 X-ray groups that have been spectroscopically confirmed to lie at the cluster redshift. These groups have mass estimates in the range 2x10^13-7x10^14Msun, and group-to-cluster mass ratios as low as 0.02. The comoving number density of X-ray groups in the infall regions is ~25x higher than that seen for isolated X-ray groups from the XXL survey. The average mass per cluster contained within these X-ray groups is 2.2x10^14Msun, or 19% of the mass within the primary cluster itself. We estimate that ~10^15Msun clusters increase their masses by 16% between z=0.223 and the present day due to the accretion of groups with M200>10^13.2Msun. This represents about half of the expected mass growth rate of clusters at these late epochs. The other half is likely to come from smooth accretion of matter not bound in halos. The mass function of the infalling X-ray groups appears significantly top-heavy with respect to that of field X-ray systems, consistent with expectations from numerical simulations, and the basic consequences of collapsed massive dark matter halos being biased tracers of the underlying large-scale density distribution. > > Sorry for the confusion & best regards, > Jorrit and Angela > > > > Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Feb 19 20:37:09 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 19 Feb 2018 19:37:09 +0000 Subject: [Astronomy seminar] Next astro seminar Friday 23/02 at 10:30 in FC61 Message-ID: Dear all, welcome to the weekly astronomy seminar on Friday 23/02 at 10:30 in FC61. The speaker will be Prof. Elena D'onghia from the University of Wisconsin-Madison. Because we haven’t yet a working online agenda we include here below a list of the upcoming seminars. Kind regards, Angela & Jorrit Title: Deciphering the Milky Way: dark and visible matter at home and at the edge of the Universe Abstract By providing information on distances and proper motions for one billion stars, the Gaia satellite will allow us to investigate the major unsolved challenges in galaxy formation: the nature of dark matter, the origin of Galactic spiral activity and its relation to the bar, and more generally the history of the Milky Way. Gaia will also reveal the nature of associations of stars with coherent velocities observed in the solar neighborhood. The origin of these systems, named moving groups, remains uncertain, but their dynamics and evolution hold the key to understanding complex phenomena, such as resonances in bars and spiral arms and ultimately the dynamics of the stellar disk. My research aims to develop a theoretical approach to modeling and exploiting the big data and address problems at the forefront of Galactic Dynamics at various scales. What is the origin of the spiral activity in the Milky Way? How are all of these perturbations to the structure of the Galaxy coupled to each other directly and through the dark-matter halo? I will also present my ongoing work on statistical techniques of big-data analysis and advanced numerical simulations used to interpret the nature of stars moving in groups and discover streams in the stellar disk of the Milky Way. Astro seminar agenda: 02/03 Sportlov 09/03 -- 16/03 -- 23/03 Florent Renaud 30/03 Easter break 06/04 Nina Almgren 13/04 Jim Dale 20/04 Brent Groves 27/04 Mickaël Bonnefoy 04/05 Sara Bladh 11/05 Klämdag 18/05 Anastasia Fialkov 25/05 Carolina Robustini 01/06 -- 08/06 Esha Kundu 15/06 Matteo Messa 22/06 Midsommar 29/06 Summer break ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- From seminars-announce.astro-at-su.se at lists.su.se Fri Feb 23 09:06:52 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 23 Feb 2018 09:06:52 +0100 Subject: [Astronomy seminar] Reminder: astro seminar Today at 10:30 in FC61 In-Reply-To: <04BA8B28-9F4E-47E8-AD04-04115A31450A@astro.su.se> References: <04BA8B28-9F4E-47E8-AD04-04115A31450A@astro.su.se> Message-ID: A kind reminder Angela & Jorrit > On 19 Feb 2018, at 20:37, Angela Adamo wrote: > > Dear all, > > welcome to the weekly astronomy seminar on Friday 23/02 at 10:30 in FC61. > The speaker will be Prof. Elena D'onghia from the University of Wisconsin-Madison. > Because we haven’t yet a working online agenda we include here below a list of the upcoming seminars. > > Kind regards, > Angela & Jorrit > > Title: > Deciphering the Milky Way: dark and visible matter at home and at the edge of the Universe > > Abstract > By providing information on distances and proper motions for one billion stars, the Gaia satellite will allow us to investigate the major unsolved challenges in galaxy formation: the nature of dark matter, the origin of Galactic spiral activity and its relation to the bar, and more generally the history of the Milky Way. Gaia will also reveal the nature of associations of stars with coherent velocities observed in the solar neighborhood. The origin of these systems, named moving groups, remains uncertain, but their dynamics and evolution hold the key to understanding complex phenomena, such as resonances in bars and spiral arms and ultimately the dynamics of the stellar disk. My research aims to develop a theoretical approach to modeling and exploiting the big data and address problems at the forefront of Galactic Dynamics at various scales. What is the origin of the spiral activity in the Milky Way? How are all of these perturbations to the structure of the Galaxy coupled to each other directly and through the dark-matter halo? I will also present my ongoing work on statistical techniques of big-data analysis and advanced numerical simulations used to interpret the nature of stars moving in groups and discover streams in the stellar disk of the Milky Way. > > > Astro seminar agenda: > 02/03 Sportlov > 09/03 -- > 16/03 -- > 23/03 Florent Renaud > 30/03 Easter break > 06/04 Nina Almgren > 13/04 Jim Dale > 20/04 Brent Groves > 27/04 Mickaël Bonnefoy > 04/05 Sara Bladh > 11/05 Klämdag > 18/05 Anastasia Fialkov > 25/05 Carolina Robustini > 01/06 -- > 08/06 Esha Kundu > 15/06 Matteo Messa > 22/06 Midsommar > 29/06 Summer break > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > From seminars-announce.astro-at-su.se at lists.su.se Thu Mar 1 09:20:28 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Thu, 1 Mar 2018 09:20:28 +0100 Subject: [Astronomy seminar] No astronomy seminar this week because of school vacation Message-ID: Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Tue Mar 6 17:48:30 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 6 Mar 2018 16:48:30 +0000 Subject: [Astronomy seminar] Next Astro Friday seminar the 9th/03 at 10:30 in FC61 Message-ID: Dear all, welcome to the next astronomy seminar, Friday 9th of March at 10:30 in FC61. The speaker of this week is Dr. Nathalie de Ruette from Fysikum, SU. Title and abstract are below together with an updated spring agenda. Welcome, Angela & Jorrit Formation and Destruction Mechanisms of Atomic and Molecular Ions of Astrophysical Interest. The chain of chemical reactions leading towards life is thought to begin in molecular clouds when carbon atoms are fixed into molecules, initiating the synthesis of complex organic species. Up to 20 % of the cosmic carbon is believed to be in the form of Polycyclic Aromatic Hydrocarbons. Anions also play crucial roles in a range of astrophysical environments and planetary atmospheres. How large molecules and anions can survive and evolve in harsh environments, such as in planetary nebulae with strong UV radiation fields or in shock-heated outflows of supernovae is still not fully understood. Spectroscopic observations, combined with sophisticated astrochemical models to interpret the collected spectra, provide much of our knowledge of these processes. However, few reactions have been studied experimentally in a range of collision energies relevant for cold astrophysical environments. Uncertainties in the underlying chemical data in these models limit our understanding of the molecular universe. In this talk, I will present some key reactions for the abundances of chemical compounds and the ionization balance in various astrophysical environments, and show results of experiments performed at DESIREE facility in Stockholm University and elsewhere to address some of these issues. Several methods used in these experiments will be briefly presented including the merged beams method and collision induced dissociation. Our reaction studies will help to provide a better basis for astrochemical models and benchmarks for future theoretical development. 16/03 Hanindyo Kuncarayakti 23/03 Florent Renaud 30/03 Easter break 06/04 Nina Almgren 13/04 Jim Dale 20/04 Brent Groves 27/04 Mickaël Bonnefoy 04/05 Sara Bladh 11/05 Klämdag 18/05 Anastasia Fialkov 25/05 Carolina Robustini 01/06 Catherine Watkinson 08/06 Esha Kundu 15/06 Matteo Messa 22/06 Midsommar 29/06 Summer break ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Mar 9 08:18:04 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 9 Mar 2018 08:18:04 +0100 Subject: [Astronomy seminar] Reminder: Astro Friday seminar today at 10:30 in FC61 In-Reply-To: <4BC1C62F-15A7-44AD-AE80-9BD244F9D803@astro.su.se> References: <4BC1C62F-15A7-44AD-AE80-9BD244F9D803@astro.su.se> Message-ID: Welcome Angela & Jorrit > On 6 Mar 2018, at 17:48, Angela Adamo wrote: > > Dear all, > welcome to the next astronomy seminar, Friday 9th of March at 10:30 in FC61. > The speaker of this week is Dr. Nathalie de Ruette from Fysikum, SU. > Title and abstract are below together with an updated spring agenda. > > Welcome, > Angela & Jorrit > > > Formation and Destruction Mechanisms of Atomic and Molecular Ions of Astrophysical Interest. > > The chain of chemical reactions leading towards life is thought to begin in molecular clouds when carbon atoms are fixed into molecules, initiating the synthesis of complex organic species. Up to 20 % of the cosmic carbon is believed to be in the form of Polycyclic Aromatic Hydrocarbons. Anions also play crucial roles in a range of astrophysical environments and planetary atmospheres. How large molecules and anions can survive and evolve in harsh environments, such as in planetary nebulae with strong UV radiation fields or in shock-heated outflows of supernovae is still not fully understood. Spectroscopic observations, combined with sophisticated astrochemical models to interpret the collected spectra, provide much of our knowledge of these processes. However, few reactions have been studied experimentally in a range of collision energies relevant for cold astrophysical environments. Uncertainties in the underlying chemical data in these models limit our understanding of the molecular universe. > In this talk, I will present some key reactions for the abundances of chemical compounds and the ionization balance in various astrophysical environments, and show results of experiments performed at DESIREE facility in Stockholm University and elsewhere to address some of these issues. Several methods used in these experiments will be briefly presented including the merged beams method and collision induced dissociation. Our reaction studies will help to provide a better basis for astrochemical models and benchmarks for future theoretical development. > > 16/03 Hanindyo Kuncarayakti > 23/03 Florent Renaud > 30/03 Easter break > 06/04 Nina Almgren > 13/04 Jim Dale > 20/04 Brent Groves > 27/04 Mickaël Bonnefoy > 04/05 Sara Bladh > 11/05 Klämdag > 18/05 Anastasia Fialkov > 25/05 Carolina Robustini > 01/06 Catherine Watkinson > 08/06 Esha Kundu > 15/06 Matteo Messa > 22/06 Midsommar > 29/06 Summer break > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Mar 12 21:02:00 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 12 Mar 2018 20:02:00 +0000 Subject: [Astronomy seminar] Next Astro Friday seminar the 16th/03 at 10:30 in FC61 In-Reply-To: <4BC1C62F-15A7-44AD-AE80-9BD244F9D803@astro.su.se> References: <4BC1C62F-15A7-44AD-AE80-9BD244F9D803@astro.su.se> Message-ID: Dear all, welcome to the next astronomy seminar, Friday 16th of March at 10:30 in FC61. The speaker of this week is Dr. Hanindyo Kuncarayakti from the University of Turku, Finland. Title and abstract can be find here https://www.albanova.se/event/weekly-astronomy-seminar-study-of-supernova-progenitors-and-environments-through-integral-field-spectroscopy/ and below an updated spring agenda. Welcome, Angela & Jorrit 23/03 Florent Renaud 30/03 Easter break 06/04 Nina Almgren 13/04 Jim Dale 20/04 Brent Groves 27/04 Mickaël Bonnefoy 04/05 Sara Bladh 11/05 Klämdag 18/05 Anastasia Fialkov 25/05 Carolina Robustini 01/06 Catherine Watkinson 08/06 Esha Kundu 15/06 Matteo Messa 22/06 Midsommar 29/06 Summer break ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Mar 16 10:19:06 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 16 Mar 2018 09:19:06 +0000 Subject: [Astronomy seminar] Reminder: Next Astro Friday seminar the 16th/03 at 10:30 in FC61 In-Reply-To: <094226AC-856A-43B4-918D-B8FADD939F04@astro.su.se> References: <4BC1C62F-15A7-44AD-AE80-9BD244F9D803@astro.su.se> <094226AC-856A-43B4-918D-B8FADD939F04@astro.su.se> Message-ID: In 10 min! ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- On 12 Mar 2018, at 21:02, Angela Adamo > wrote: Dear all, welcome to the next astronomy seminar, Friday 16th of March at 10:30 in FC61. The speaker of this week is Dr. Hanindyo Kuncarayakti from the University of Turku, Finland. Title and abstract can be find here https://www.albanova.se/event/weekly-astronomy-seminar-study-of-supernova-progenitors-and-environments-through-integral-field-spectroscopy/ and below an updated spring agenda. Welcome, Angela & Jorrit 23/03 Florent Renaud 30/03 Easter break 06/04 Nina Almgren 13/04 Jim Dale 20/04 Brent Groves 27/04 Mickaël Bonnefoy 04/05 Sara Bladh 11/05 Klämdag 18/05 Anastasia Fialkov 25/05 Carolina Robustini 01/06 Catherine Watkinson 08/06 Esha Kundu 15/06 Matteo Messa 22/06 Midsommar 29/06 Summer break ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Mar 19 20:21:32 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 19 Mar 2018 19:21:32 +0000 Subject: [Astronomy seminar] Next Astro Friday seminar the 23rd/03 at 10:30 in FC61 In-Reply-To: <4BC1C62F-15A7-44AD-AE80-9BD244F9D803@astro.su.se> References: <4BC1C62F-15A7-44AD-AE80-9BD244F9D803@astro.su.se> Message-ID: Dear all, welcome to the next astronomy seminar, Friday 23rd of March at 10:30 in FC61. The speaker of this week is Dr. Florent Renaud from Lund Observatory. Title and abstract can be found here https://www.albanova.se/event/weekly-astronomy-seminar-star-formation-in-evolving-galaxies-a-diverse-universality/ Welcome, Angela & Jorrit Spring agenda 30/03 Easter break 06/04 -- 13/04 Jim Dale 20/04 Brent Groves 27/04 Mickaël Bonnefoy 04/05 Sara Bladh 11/05 Klämdag 18/05 Anastasia Fialkov 25/05 Carolina Robustini 01/06 Catherine Watkinson 08/06 Esha Kundu 15/06 Matteo Messa 22/06 Midsommar 29/06 Summer break ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- On 06 Mar 2018, at 17:48, Angela Adamo > wrote: Dear all, welcome to the next astronomy seminar, Friday 9th of March at 10:30 in FC61. The speaker of this week is Dr. Nathalie de Ruette from Fysikum, SU. Title and abstract are below together with an updated spring agenda. Welcome, Angela & Jorrit Formation and Destruction Mechanisms of Atomic and Molecular Ions of Astrophysical Interest. The chain of chemical reactions leading towards life is thought to begin in molecular clouds when carbon atoms are fixed into molecules, initiating the synthesis of complex organic species. Up to 20 % of the cosmic carbon is believed to be in the form of Polycyclic Aromatic Hydrocarbons. Anions also play crucial roles in a range of astrophysical environments and planetary atmospheres. How large molecules and anions can survive and evolve in harsh environments, such as in planetary nebulae with strong UV radiation fields or in shock-heated outflows of supernovae is still not fully understood. Spectroscopic observations, combined with sophisticated astrochemical models to interpret the collected spectra, provide much of our knowledge of these processes. However, few reactions have been studied experimentally in a range of collision energies relevant for cold astrophysical environments. Uncertainties in the underlying chemical data in these models limit our understanding of the molecular universe. In this talk, I will present some key reactions for the abundances of chemical compounds and the ionization balance in various astrophysical environments, and show results of experiments performed at DESIREE facility in Stockholm University and elsewhere to address some of these issues. Several methods used in these experiments will be briefly presented including the merged beams method and collision induced dissociation. Our reaction studies will help to provide a better basis for astrochemical models and benchmarks for future theoretical development. 16/03 Hanindyo Kuncarayakti 23/03 Florent Renaud 30/03 Easter break 06/04 Nina Almgren 13/04 Jim Dale 20/04 Brent Groves 27/04 Mickaël Bonnefoy 04/05 Sara Bladh 11/05 Klämdag 18/05 Anastasia Fialkov 25/05 Carolina Robustini 01/06 Catherine Watkinson 08/06 Esha Kundu 15/06 Matteo Messa 22/06 Midsommar 29/06 Summer break ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Tue Mar 20 10:24:15 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 20 Mar 2018 09:24:15 +0000 Subject: [Astronomy seminar] Special seminar tomorrow at 10:30 in FC61: General introduction and updates on ALMA cycle6 Message-ID: Dear all, as part of the ARC node initiative to support the Swedish community in preparation of the ALMA proposal submission Dr. Sebastien Muller will visit the astronomy department tomorrow. He will give an informal short seminar about the new ALMA capabilities for cycle 6, and especially what the Nordic ARC node can do to support and help your ALMA projects from proposal preparation, to data reduction, and advanced analysis/processing. The seminar will start at 10:00 am in FC61. Sebastien will be visiting the department for the whole day, so you may be able to talk to him afterwards. Kind regards, Angela ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- From seminars-announce.astro-at-su.se at lists.su.se Tue Mar 20 13:03:35 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 20 Mar 2018 12:03:35 +0000 Subject: [Astronomy seminar] Special seminar tomorrow at 10:30 in FC61: General introduction and updates on ALMA cycle6 In-Reply-To: <893FFFCC-4E43-4CD3-AEC1-5FDBDC3BCD12@astro.su.se> References: <893FFFCC-4E43-4CD3-AEC1-5FDBDC3BCD12@astro.su.se> Message-ID: There was a typo on the email. The scheduled time of the seminar is 10:30. Angela ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- > On 20 Mar 2018, at 10:24, Angela Adamo wrote: > > Dear all, > as part of the ARC node initiative to support the Swedish community in preparation of the ALMA proposal submission Dr. Sebastien Muller will visit the astronomy department tomorrow. > > He will give an informal short seminar about the new ALMA capabilities for cycle 6, and especially what the Nordic ARC node can do to support and help your ALMA projects from proposal preparation, to data reduction, and advanced analysis/processing. > > The seminar will start at 10:00 am in FC61. > > Sebastien will be visiting the department for the whole day, so you may be able to talk to him afterwards. > > Kind regards, > Angela > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > From seminars-announce.astro-at-su.se at lists.su.se Wed Mar 21 08:20:02 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Wed, 21 Mar 2018 08:20:02 +0100 Subject: [Astronomy seminar] Special seminar TODAY at 10:30 in FC61: General introduction and updates on ALMA cycle6 In-Reply-To: <6CE97D52-C203-4D98-8A95-BA302A56D740@astro.su.se> References: <893FFFCC-4E43-4CD3-AEC1-5FDBDC3BCD12@astro.su.se> <6CE97D52-C203-4D98-8A95-BA302A56D740@astro.su.se> Message-ID: A kind reminder of today special seminar at 10:30 in FC61. Angela > On 20 Mar 2018, at 13:03, Angela Adamo wrote: > > There was a typo on the email. The scheduled time of the seminar is 10:30. > > Angela > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > >> On 20 Mar 2018, at 10:24, Angela Adamo wrote: >> >> Dear all, >> as part of the ARC node initiative to support the Swedish community in preparation of the ALMA proposal submission Dr. Sebastien Muller will visit the astronomy department tomorrow. >> >> He will give an informal short seminar about the new ALMA capabilities for cycle 6, and especially what the Nordic ARC node can do to support and help your ALMA projects from proposal preparation, to data reduction, and advanced analysis/processing. >> >> The seminar will start at 10:00 am in FC61. >> >> Sebastien will be visiting the department for the whole day, so you may be able to talk to him afterwards. >> >> Kind regards, >> Angela >> >> >> ------------------------------------------------------- >> Angela Adamo >> >> Department of Astronomy >> Stockholm University and Oskar Klein Centre >> SE-10691 Stockholm - Sweden >> tel: +46 (0)8 5537 8556 >> email: angela.adamo at astro.su.se >> http://ttt.astro.su.se/~adamo >> ------------------------------------------------------- >> > From seminars-announce.astro-at-su.se at lists.su.se Fri Mar 23 08:00:18 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 23 Mar 2018 08:00:18 +0100 Subject: [Astronomy seminar] Reminder: Astro Friday seminar today at 10:30 in FC61 In-Reply-To: References: <4BC1C62F-15A7-44AD-AE80-9BD244F9D803@astro.su.se> Message-ID: Welcome! Angela > On 19 Mar 2018, at 20:21, Angela Adamo wrote: > > Dear all, > welcome to the next astronomy seminar, Friday 23rd of March at 10:30 in FC61. > The speaker of this week is Dr. Florent Renaud from Lund Observatory. > Title and abstract can be found here https://www.albanova.se/event/weekly-astronomy-seminar-star-formation-in-evolving-galaxies-a-diverse-universality/ > > > Welcome, > Angela & Jorrit > > > Spring agenda > 30/03 Easter break > 06/04 -- > 13/04 Jim Dale > 20/04 Brent Groves > 27/04 Mickaël Bonnefoy > 04/05 Sara Bladh > 11/05 Klämdag > 18/05 Anastasia Fialkov > 25/05 Carolina Robustini > 01/06 Catherine Watkinson > 08/06 Esha Kundu > 15/06 Matteo Messa > 22/06 Midsommar > 29/06 Summer break > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > >> On 06 Mar 2018, at 17:48, Angela Adamo wrote: >> >> Dear all, >> welcome to the next astronomy seminar, Friday 9th of March at 10:30 in FC61. >> The speaker of this week is Dr. Nathalie de Ruette from Fysikum, SU. >> Title and abstract are below together with an updated spring agenda. >> >> Welcome, >> Angela & Jorrit >> >> >> Formation and Destruction Mechanisms of Atomic and Molecular Ions of Astrophysical Interest. >> >> The chain of chemical reactions leading towards life is thought to begin in molecular clouds when carbon atoms are fixed into molecules, initiating the synthesis of complex organic species. Up to 20 % of the cosmic carbon is believed to be in the form of Polycyclic Aromatic Hydrocarbons. Anions also play crucial roles in a range of astrophysical environments and planetary atmospheres. How large molecules and anions can survive and evolve in harsh environments, such as in planetary nebulae with strong UV radiation fields or in shock-heated outflows of supernovae is still not fully understood. Spectroscopic observations, combined with sophisticated astrochemical models to interpret the collected spectra, provide much of our knowledge of these processes. However, few reactions have been studied experimentally in a range of collision energies relevant for cold astrophysical environments. Uncertainties in the underlying chemical data in these models limit our understanding of the molecular universe. >> In this talk, I will present some key reactions for the abundances of chemical compounds and the ionization balance in various astrophysical environments, and show results of experiments performed at DESIREE facility in Stockholm University and elsewhere to address some of these issues. Several methods used in these experiments will be briefly presented including the merged beams method and collision induced dissociation. Our reaction studies will help to provide a better basis for astrochemical models and benchmarks for future theoretical development. >> >> 16/03 Hanindyo Kuncarayakti >> 23/03 Florent Renaud >> 30/03 Easter break >> 06/04 Nina Almgren >> 13/04 Jim Dale >> 20/04 Brent Groves >> 27/04 Mickaël Bonnefoy >> 04/05 Sara Bladh >> 11/05 Klämdag >> 18/05 Anastasia Fialkov >> 25/05 Carolina Robustini >> 01/06 Catherine Watkinson >> 08/06 Esha Kundu >> 15/06 Matteo Messa >> 22/06 Midsommar >> 29/06 Summer break >> ------------------------------------------------------- >> Angela Adamo >> >> Department of Astronomy >> Stockholm University and Oskar Klein Centre >> SE-10691 Stockholm - Sweden >> tel: +46 (0)8 5537 8556 >> email: angela.adamo at astro.su.se >> http://ttt.astro.su.se/~adamo >> ------------------------------------------------------- >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Tue Apr 10 10:55:48 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 10 Apr 2018 08:55:48 +0000 Subject: [Astronomy seminar] Next astro Friday seminar the 13th of April at 10:30 in FC61 Message-ID: Dear all, we restart our seminar series after the Spring break. The next seminar will be held in room FC61 at 10:30 am on Friday 13th of April. The speaker of this week will be Dr. James Dale from the University of Hertfordshire, UK. Jim is an expert on numerical programming (both SPH and radiative transfer). His field of expertise encompasses star formation and feedback at sub-kiloparsec scales. If you are interested in talking to Jim you will find him in room c6:3015. He will visit for the entire week. Welcome, Angela and Jorrit upcoming seminars: > 20/04 Brent Groves > 27/04 Mickaël Bonnefoy > 04/05 Sara Bladh > 11/05 Klämdag > 18/05 Anastasia Fialkov > 25/05 Carolina Robustini > 01/06 Catherine Watkinson > 08/06 Esha Kundu > 15/06 Matteo Messa > 22/06 Midsommar > 29/06 Summer break ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- From seminars-announce.astro-at-su.se at lists.su.se Fri Apr 13 08:25:27 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 13 Apr 2018 08:25:27 +0200 Subject: [Astronomy seminar] Reminder: Today astro Friday seminar at 10:30 in FC61 In-Reply-To: <11DD24DD-DBA1-4CB3-8D53-56EC6E3E6DC2@astro.su.se> References: <11DD24DD-DBA1-4CB3-8D53-56EC6E3E6DC2@astro.su.se> Message-ID: A kind reminder of today seminar by Jim Dale. Star formation in the Galactic Centre I will discuss a suite of new hydrodynamical simulations of molecular cloud evolution and star formation within 100 pc of the Galactic Centre, and show that these clouds do not behave in the same fashion as those in the rest of the Galactic disk. Angela > On 10 Apr 2018, at 10:55, Angela Adamo wrote: > > Dear all, > we restart our seminar series after the Spring break. > The next seminar will be held in room FC61 at 10:30 am on Friday 13th of April. > The speaker of this week will be Dr. James Dale from the University of Hertfordshire, UK. > > Jim is an expert on numerical programming (both SPH and radiative transfer). His field of expertise encompasses star formation and feedback at sub-kiloparsec scales. If you are interested in talking to Jim you will find him in room c6:3015. He will visit for the entire week. > > Welcome, > Angela and Jorrit > > > upcoming seminars: > >> 20/04 Brent Groves >> 27/04 Mickaël Bonnefoy >> 04/05 Sara Bladh >> 11/05 Klämdag >> 18/05 Anastasia Fialkov >> 25/05 Carolina Robustini >> 01/06 Catherine Watkinson >> 08/06 Esha Kundu >> 15/06 Matteo Messa >> 22/06 Midsommar >> 29/06 Summer break > > > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > From seminars-announce.astro-at-su.se at lists.su.se Mon Apr 16 20:58:54 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 16 Apr 2018 18:58:54 +0000 Subject: [Astronomy seminar] Next astro Friday seminar the 20th of April at 10:30 in FC61 Message-ID: Dear all, The next seminar will be held in room FC61 at 10:30 am on Friday 20th of April. See https://www.albanova.se/event/weekly-astronomy…ies-near-and-far/ ‎ The speaker of this week will be Dr. Brent Groves from the Australian National University of Mt Stronlo Observatory Brent is an expert on ionised, warm, and cold ISM in local and high redshift galaxies. He will visit for the week and is sitting in the office c6:3041. You are welcome to talk to him! Title and abstract follow, as well as an outline of the spring agenda. Kind regards, Angela & Jorrit Title: Tracing Gas in Galaxies Near and Far Abstract: While the stellar populations of galaxies gives insight into their past, determining their gas content is vital to understand their future growth. In the nearby universe HI observations have shown us the gas distribution of galaxies far outside their optical disk, yet becomes difficult to detect in the distant Universe. Here I will talk about determining the total gas mass in galaxies near and far, and concentrate on on how we can determine their gas mass at all redshifts through a common associate, dust. > 27/04 Mickaël Bonnefoy > 04/05 Sara Bladh 08/05 Raquel Albuquerqe > 11/05 Klämdag > 18/05 Anastasia Fialkov > 25/05 Carolina Robustini > 01/06 Catherine Watkinson > 08/06 Esha Kundu > 15/06 Matteo Messa > 22/06 Midsommar > 29/06 Summer break ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- From seminars-announce.astro-at-su.se at lists.su.se Fri Apr 20 08:13:18 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 20 Apr 2018 08:13:18 +0200 Subject: [Astronomy seminar] Reminder: astro Friday seminar today at 10:30 in FC61 In-Reply-To: <3F4DFA7B-AB8A-4FEB-AAC2-341057B7CC0A@astro.su.se> References: <3F4DFA7B-AB8A-4FEB-AAC2-341057B7CC0A@astro.su.se> Message-ID: A kind reminder of today seminar. Angela & Jorrit > On 16 Apr 2018, at 20:58, Angela Adamo wrote: > > Dear all, > The next seminar will be held in room FC61 at 10:30 am on Friday 20th of April. See https://www.albanova.se/event/weekly-astronomy…ies-near-and-far/ ‎ > The speaker of this week will be Dr. Brent Groves from the Australian National University of Mt Stronlo Observatory > > Brent is an expert on ionised, warm, and cold ISM in local and high redshift galaxies. He will visit for the week and is sitting in the office c6:3041. > You are welcome to talk to him! > > Title and abstract follow, as well as an outline of the spring agenda. > > Kind regards, > Angela & Jorrit > > Title: Tracing Gas in Galaxies Near and Far > > Abstract: While the stellar populations of galaxies gives insight into their past, determining their gas content is vital to understand their future growth. In the nearby universe HI observations have shown us the gas distribution of galaxies far outside their optical disk, yet becomes difficult to detect in the distant Universe. Here I will talk about determining the total gas mass in galaxies near and far, and concentrate on on how we can determine their gas mass at all redshifts through a common associate, dust. > > >> 27/04 Mickaël Bonnefoy >> 04/05 Sara Bladh > 08/05 Raquel Albuquerqe >> 11/05 Klämdag >> 18/05 Anastasia Fialkov >> 25/05 Carolina Robustini >> 01/06 Catherine Watkinson >> 08/06 Esha Kundu >> 15/06 Matteo Messa >> 22/06 Midsommar >> 29/06 Summer break > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > From seminars-announce.astro-at-su.se at lists.su.se Tue Apr 24 09:22:16 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 24 Apr 2018 07:22:16 +0000 Subject: [Astronomy seminar] Next Astro seminar Friday 27th of April at 10:30 in FC61 Message-ID: Dear all, welcome to our weekly appointment. The speaker of this week is Dr. Mikael Bonnefoy, from the University of Grenoble, France. Title and abstract can be found here https://www.albanova.se/event/weekly-astronomy-seminar-characterization-of-giant-planets-and-light-brown-dwarfs-companions-on-wide-orbits-with-vlt-sphere/ We have now also an updated agenda of our weekly seminar in the department webpage https://www.astro.su.se ("upcoming events”/“kommande händelser”) Kind regards, Angela & Jorrit ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Apr 27 09:11:54 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 27 Apr 2018 07:11:54 +0000 Subject: [Astronomy seminar] Reminder: Astro seminar today at 10:30 in FC61 In-Reply-To: <3DD80BEC-7C92-4FA9-B755-B9BB57C70D25@astro.su.se> References: <3DD80BEC-7C92-4FA9-B755-B9BB57C70D25@astro.su.se> Message-ID: A kind reminder of today seminar + title and abstract Title: Characterization of Giant Planets and Light Brown Dwarfs Companions on Wide Orbits with VLT/SPHERE The SHINE survey conducted on the SPHERE high contrast imager at VLT is targeting 400-500 nearby stars to characterize the giant planet population beyond 5 AU. Once a companion is resolved, the collection of sub-instrument of SPHERE can uniquely provide its spectrum, photometry, and astrometry from 0.5 to 2.5 µm. Those informations are used to better understand the orbital, physical, and chemical properties of the objects, and in turn to access the formation modes and dynamical evolution of planetary systems. During the past three years, we have achieved through SHINE a complete characterization of all known bona-fide planets discovered so far (HR8799 bcde, 51 Eri b), as well as some benchmark brown dwarf companions (GJ504b, HD 206893b). We also found new systems with peculiar architectures and atmospheric properties. I will describe the most tantalizing (and sometime puzzling) results obtained thus far and explain what they tell us about the atmosphere of giant planets, their connection to brown-dwarf atmospheres, and their origins. On 24 Apr 2018, at 09:22, Angela Adamo > wrote: Dear all, welcome to our weekly appointment. The speaker of this week is Dr. Mikael Bonnefoy, from the University of Grenoble, France. Title and abstract can be found here https://www.albanova.se/event/weekly-astronomy-seminar-characterization-of-giant-planets-and-light-brown-dwarfs-companions-on-wide-orbits-with-vlt-sphere/ We have now also an updated agenda of our weekly seminar in the department webpage https://www.astro.su.se ("upcoming events”/“kommande händelser”) Kind regards, Angela & Jorrit ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Wed May 2 10:04:53 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Wed, 2 May 2018 08:04:53 +0000 Subject: [Astronomy seminar] Next Astro seminar Friday 4th of May at 10:30 in FC61 Message-ID: Dear all, welcome to our weekly appointment. The speaker of this week is Dr. Sara Bladh, from the University of Uppsala. Sara is an expert in modelling radiation-driven winds in late type stars. Title: The evolution of DARWIN - the current status of wind models for AGB stars Abstract: Asymptotic giant branch (AGB) stars are luminous, cool giants with substantial mass loss. Dust formed in the stellar atmospheres plays a key role for the mass-loss mechanism: radial pulsations of the surface layers of the stars levitate material to distances where dust can form, which then is accelerated outward by radiation pressure. AGB stars are significant dust donors in the universe, feeding newly produced elements into the surrounding interstellar medium in the form of gas and dust through these stellar winds. To model these dense outflows we use the DARWIN (Dynamic Atmosphere and Radiation-driven Wind models based on Implicit Numerics) code. The mass-loss process is modelled from first principles, with frequency-dependent radiation-hydrodynamics, and dust growth and evaporation. The DARWIN models have successfully been able produce outflows with dynamical and photometric properties compatible with observations, for both C-type and M-type AGB stars (e.g. Eriksson et al. 2014, Bladh et al. 2015). In this talk I will present the recent development in the DARWIN wind models: I will show results from a new large grid of M-type AGB star models, spanning a wide range in effective temperature, mass and lumiosity, as well as results from models for C-type AGB stars at low metallicities, compatible to those in LMC and SMC. Our seminar agends is available both on the albanova webpage https://www.albanova.se/events/seminars/ and on our department webpage https://www.astro.su.se ("upcoming events”/“kommande händelser”) Kind regards, Angela & Jorrit ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri May 4 08:30:43 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 4 May 2018 08:30:43 +0200 Subject: [Astronomy seminar] Reminder: Astro seminar today at 10:30 in FC61 In-Reply-To: <68E942A9-ABFD-4B20-8A9D-9CA73F79FB27@astro.su.se> References: <68E942A9-ABFD-4B20-8A9D-9CA73F79FB27@astro.su.se> Message-ID: Welcome! Angela & Jorrit > On 2 May 2018, at 10:04, Angela Adamo wrote: > > Dear all, > welcome to our weekly appointment. > The speaker of this week is Dr. Sara Bladh, from the University of Uppsala. > Sara is an expert in modelling radiation-driven winds in late type stars. > > Title: The evolution of DARWIN - the current status of wind models for AGB stars > > Abstract: Asymptotic giant branch (AGB) stars are luminous, cool giants with substantial mass loss. Dust formed in the stellar atmospheres plays a key role for the mass-loss mechanism: radial pulsations of the surface layers of the stars levitate material to distances where dust can form, which then is accelerated outward by radiation pressure. AGB stars are significant dust donors in the universe, feeding newly produced elements into the surrounding interstellar medium in the form of gas and dust through these stellar winds. > > To model these dense outflows we use the DARWIN (Dynamic Atmosphere and Radiation-driven Wind models based on Implicit Numerics) code. The mass-loss process is modelled from first principles, with frequency-dependent radiation-hydrodynamics, and dust growth and evaporation. The DARWIN models have successfully been able produce outflows with dynamical and photometric properties compatible with observations, for both C-type and M-type AGB stars (e.g. Eriksson et al. 2014, Bladh et al. 2015). In this talk I will present the recent development in the DARWIN wind models: I will show results from a new large grid of M-type AGB star models, spanning a wide range in effective temperature, mass and lumiosity, as well as results from models for C-type AGB stars at low metallicities, compatible to those in LMC and SMC. > > > Our seminar agends is available both on the albanova webpage https://www.albanova.se/events/seminars/ and on our department webpage https://www.astro.su.se ("upcoming events”/“kommande händelser”) > > Kind regards, > Angela & Jorrit > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon May 7 08:27:23 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 7 May 2018 06:27:23 +0000 Subject: [Astronomy seminar] Weekly astro seminar: ONLY THIS WEEK on Tuesday at 10:30 in FC61 Message-ID: Dear all, to ensure everyone has the chance to attend the seminar, we have schedule this week seminar for tomorrow at 10:30 in FC61. The speaker of this week is Raquel Albuquerqe, from the University of Porto and Observatory of Paris. She will speak about: Simulating accretion and outflow regions in YSOs. Abstract: One of the puzzling questions surrounding Young Stellar Objects (YSOs) concerns the unexpected evolution of their angular momentum. Theoretically, we should expect Classical T Tauri stars (CTTs) to rotate faster due to ongoing accretion and contraction processes towards the main-sequence. Apparently, that it is not observed. Many authors suggest that the interaction star-disk has an important role towards the deceleration of these objects. Additionally, this interaction includes not only accretion, but also outflow mechanisms. In this presentation the dynamics of accretion and outflow regions will be characterized through observations of CTTs and numerical simulations performed with PLUTO code. This study results from a collaboration between Instituto de Astrofísica e Ciências do Espaço and Observatoire de Paris. Our seminar agends is available both on the albanova webpage https://www.albanova.se/events/seminars/ and on our department webpage https://www.astro.su.se ("upcoming events”/“kommande händelser”) Kind regards, Angela & Jorrit ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon May 7 08:28:52 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 7 May 2018 06:28:52 +0000 Subject: [Astronomy seminar] Weekly astro seminar: ONLY THIS WEEK on Tuesday at 10:30 in FC61 References: Message-ID: > > Dear all, > to ensure everyone has the chance to attend the seminar, we have schedule this week seminar for tomorrow at 10:30 in FC61. > The speaker of this week is Raquel Albuquerqe, from the University of Porto and Observatory of Paris. > She will speak about: Simulating accretion and outflow regions in YSOs. > > Abstract: > One of the puzzling questions surrounding Young Stellar Objects (YSOs) concerns the unexpected evolution of their angular momentum. Theoretically, we should expect Classical T Tauri stars (CTTs) to rotate faster due to ongoing accretion and contraction processes towards the main-sequence. Apparently, that it is not observed. Many authors suggest that the interaction star-disk has an important role towards the deceleration of these objects. Additionally, this interaction includes not only accretion, but also outflow mechanisms. > In this presentation the dynamics of accretion and outflow regions will be characterized through observations of CTTs and numerical simulations performed with PLUTO code. This study results from a collaboration between Instituto de Astrofísica e Ciências do Espaço and Observatoire de Paris. > > > Our seminar agends is available both on the albanova webpage https://www.albanova.se/events/seminars/ and on our department webpage https://www.astro.su.se ("upcoming events”/“kommande händelser”) > > Kind regards, > Angela & Jorrit > > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > From seminars-announce.astro-at-su.se at lists.su.se Tue May 8 09:31:04 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 8 May 2018 07:31:04 +0000 Subject: [Astronomy seminar] Reminder Weekly astro seminar TODAY at 10:30 in FC61 In-Reply-To: <0E8A184D-6F31-416B-B681-9042C39061E1@astro.su.se> References: <0E8A184D-6F31-416B-B681-9042C39061E1@astro.su.se> Message-ID: A kind reminder of today seminar. > On 07 May 2018, at 08:28, Angela Adamo wrote: > > >> >> Dear all, >> to ensure everyone has the chance to attend the seminar, we have schedule this week seminar for tomorrow at 10:30 in FC61. >> The speaker of this week is Raquel Albuquerqe, from the University of Porto and Observatory of Paris. >> She will speak about: Simulating accretion and outflow regions in YSOs. >> >> Abstract: >> One of the puzzling questions surrounding Young Stellar Objects (YSOs) concerns the unexpected evolution of their angular momentum. Theoretically, we should expect Classical T Tauri stars (CTTs) to rotate faster due to ongoing accretion and contraction processes towards the main-sequence. Apparently, that it is not observed. Many authors suggest that the interaction star-disk has an important role towards the deceleration of these objects. Additionally, this interaction includes not only accretion, but also outflow mechanisms. >> In this presentation the dynamics of accretion and outflow regions will be characterized through observations of CTTs and numerical simulations performed with PLUTO code. This study results from a collaboration between Instituto de Astrofísica e Ciências do Espaço and Observatoire de Paris. >> >> >> Our seminar agends is available both on the albanova webpage https://www.albanova.se/events/seminars/ and on our department webpage https://www.astro.su.se ("upcoming events”/“kommande händelser”) >> >> Kind regards, >> Angela & Jorrit >> >> >> >> ------------------------------------------------------- >> Angela Adamo >> >> Department of Astronomy >> Stockholm University and Oskar Klein Centre >> SE-10691 Stockholm - Sweden >> tel: +46 (0)8 5537 8556 >> email: angela.adamo at astro.su.se >> http://ttt.astro.su.se/~adamo >> ------------------------------------------------------- >> > From seminars-announce.astro-at-su.se at lists.su.se Mon May 14 09:19:21 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 14 May 2018 09:19:21 +0200 Subject: [Astronomy seminar] Next Astro seminar Friday May 18 at 10:30 in FC61 Message-ID: Dear all, This week’s seminar will be on Friday May 18 at 10:30 in FC61. Ragnhild Lunnan will speak about “Fantastic Beasts (& Where to Find Them): Superluminous Supernovae from Pan-STARRS and PTF” abstract: Wide-field optical time-domain surveys provide an opportunity to discover and decipher new types of transients. One such discovery in the past decade is the class of "superluminous" supernovae (SLSNe), which have bolometric luminosities 10-100 times those of normal core-collapse and Type Ia SN, and are preferentially found in low-metallicity and highly star-forming dwarf galaxies. These SLSNe represent a challenge both to our understanding of the deaths of the most massive stars, of star formation and stellar evolution in low-metallicity environments, and of the physics of powering the optical emission in supernovae. In this talk, I will present results from the Pan-STARRS Medium Deep Survey and the Palomar Transient Factory, addressing the nature of SLSNe from two angles: 1) characterizing the explosions themselves and comparing the observed properties to model predictions, and 2) constraining the progenitor population through a comprehensive study of SLSN host galaxy environments.​ cheers, Angela & Jorrit Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Fri May 18 09:16:26 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 18 May 2018 09:16:26 +0200 Subject: [Astronomy seminar] REMINDER: Astro seminar today at 10:30 in FC61 References: Message-ID: speaker: Ragnhild Lunnan title: “Fantastic Beasts (& Where to Find Them): Superluminous Supernovae from Pan-STARRS and PTF” abstract: Wide-field optical time-domain surveys provide an opportunity to discover and decipher new types of transients. One such discovery in the past decade is the class of "superluminous" supernovae (SLSNe), which have bolometric luminosities 10-100 times those of normal core-collapse and Type Ia SN, and are preferentially found in low-metallicity and highly star-forming dwarf galaxies. These SLSNe represent a challenge both to our understanding of the deaths of the most massive stars, of star formation and stellar evolution in low-metallicity environments, and of the physics of powering the optical emission in supernovae. In this talk, I will present results from the Pan-STARRS Medium Deep Survey and the Palomar Transient Factory, addressing the nature of SLSNe from two angles: 1) characterizing the explosions themselves and comparing the observed properties to model predictions, and 2) constraining the progenitor population through a comprehensive study of SLSN host galaxy environments.​ cheers, Angela & Jorrit Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Mon May 21 10:19:16 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 21 May 2018 10:19:16 +0200 Subject: [Astronomy seminar] Next Astro seminar Friday May 25 at 10:30 in FC61 Message-ID: Dear all, This weeks astronomy seminar will be on Friday May 25 at 10:30 in FC61. Carolina Robustini will present her PhD work and speak about "Observations and measurements of the highly dynamic chromosphere”. abstract: The chromosphere is the key atmospheric layer to understand the heating of the Sun's upper atmosphere, as it is the conduit for mass and energy transferfrom the relatively cold photosphere into the hot corona. However, due to the complex physical conditions governing it, the chromosphere is also the most challenging layer to study. Thanks to this complexity, the chromospheric landscape is rich of very dynamic and energetic events, which are often driven by not-well understood mechanisms. Their study is then a necessary piece to solve the puzzle of the physics of the chromosphere. Among the many different dynamic phenomena that can be observed there, jets are indeed some of the most fascinating. This seminar will focus on the less-studied fan-shaped jets, observed in the most active areas of the Sun. These large-scale jets, which extend to several thousands of kilometers and move at hundreds of km/s, are typical of sunspot light-bridges and sunspot-group penumbrae. In this presentation, we will show high-spatial resolution observations of such regions, harbouring fan-shaped jets, which were recorded at the Swedish 1-m Solar Telescope by CRisp Imaging SpectroPolarimeter Imaging Spectropolarimeter. By means of polarimetric data inversion and other techniques that will be discussed, we are able to retrieve some of the main atmospheric parameters, as the magnetic field vector, the temperature and the velocity. The aim is to show how these parameters appear, change with height, and what are the physical consequences of it. cheers, Angela & Jorrit Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Thu May 24 13:14:19 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Thu, 24 May 2018 11:14:19 +0000 Subject: [Astronomy seminar] Public Lecture on 31 May 2018, 17:00 hrs In-Reply-To: References: <68E942A9-ABFD-4B20-8A9D-9CA73F79FB27@astro.su.se>, Message-ID: Dear All, There will be a public Lecture by Robert Kirshner, Harvard University, on 31st May (Thursday) at 17:00 hrs in the OKC auditorium. Below are the details: Public Lecture: Speaker: Robert Kirshner, Harvard University Date and time: May 31, 2018 (Thursday), 17:00-18:00 hrs Venue: OKC Auditorium? Title: Creation and Destruction through Exploding Stars Abstract: Stars seem permanent, but they are not. When stars collide, collapse, or explode astronomers leap into action to study the shreds of destruction. The death of stars creates new chemical elements and blasts them into the galaxy to become the stuff of new stars, planets, and, perhaps, living things. The oxygen atoms in the air we breathe, the calcium in our bones, and the iron in our blood were created when stars were destroyed 5 billion years ago. Regards, Poonam ??? --- Poonam Chandra, Gästprofessor Stockholms universitet, AlbaNova Institutionen för astronomi 106 91 Stockholm, Sweden Telefon: 08-5537 8557 Email: poonam.chandra at astro.su.se Web: http://www.ncra.tifr.res.in:8081/~poonam/ ________________________________ http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri May 25 07:28:01 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 25 May 2018 07:28:01 +0200 Subject: [Astronomy seminar] REMINDER: Astro seminar today at 10:30 in FC61 Message-ID: Dear all, This week's astronomy seminar will be today at 10:30 in FC61. Carolina Robustini will present her PhD work and speak about "Observations and measurements of the highly dynamic chromosphere”. Abstract: The chromosphere is the key atmospheric layer to understand the heating of the Sun's upper atmosphere, as it is the conduit for mass and energy transferfrom the relatively cold photosphere into the hot corona. However, due to the complex physical conditions governing it, the chromosphere is also the most challenging layer to study. Thanks to this complexity, the chromospheric landscape is rich of very dynamic and energetic events, which are often driven by not-well understood mechanisms. Their study is then a necessary piece to solve the puzzle of the physics of the chromosphere. Among the many different dynamic phenomena that can be observed there, jets are indeed some of the most fascinating. This seminar will focus on the less-studied fan-shaped jets, observed in the most active areas of the Sun. These large-scale jets, which extend to several thousands of kilometers and move at hundreds of km/s, are typical of sunspot light-bridges and sunspot-group penumbrae. In this presentation, we will show high-spatial resolution observations of such regions, harbouring fan-shaped jets, which were recorded at the Swedish 1-m Solar Telescope by CRisp Imaging SpectroPolarimeter Imaging Spectropolarimeter. By means of polarimetric data inversion and other techniques that will be discussed, we are able to retrieve some of the main atmospheric parameters, as the magnetic field vector, the temperature and the velocity. The aim is to show how these parameters appear, change with height, and what are the physical consequences of it. cheers, Angela & Jorrit Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Mon May 28 13:31:28 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 28 May 2018 13:31:28 +0200 Subject: [Astronomy seminar] astronomy seminar on Friday June 1 at 10.30 in FC 61 Message-ID: Dear all, This week’s astronomy seminar will be on Friday June 1 at 10.30 in FC 61. Catherine Watkinson will speak about "Non-Gaussianity of 21-cm maps in the era of the SKA" abstract: Mapping the 21-cm line with the next generation of radio interferometers promises to dramatically advance our knowledge of the process of reionization, and the nature of the first stars and galaxies. However, even if we can overcome the observational challenges, 21-cm maps will not be straightforward to interpret. For example, the signal will be very non-Gaussian during both reionization, and an earlier phase during which the effects of Lyman-$\alpha$ coupling and X-ray heating dominate the signal. There are also strong degeneracies in the various parameters that can be used to model these physical processes. It is therefore essential that we look beyond the power spectrum, and exploit multiple statistical measures. I will discuss the role that statistics like the bispectrum and skewness, both sensitive to non-Gaussianity in maps, will have to play in constraining the properties of the first stars and galaxies. In doing so I will cover a fast method for measuring the bispectrum. I will also discuss the observational prospects for the bispectrum and skewness. cheers, Angela & Jorrit Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Fri Jun 1 09:37:55 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 1 Jun 2018 09:37:55 +0200 Subject: [Astronomy seminar] REMINDER: astronomy seminar today at 10.30 in FC 61 References: Message-ID: See below. cheers, Angela & Jorrit Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 > Begin forwarded message: > > From: Jorrit Leenaarts > Subject: astronomy seminar on Friday June 1 at 10.30 in FC 61 > Date: 28 May 2018 at 13:31:28 GMT+2 > To: seminars-announce.astro-at-su.se at lists.su.se, All at Stockholm Observatory , people at nordita.org > > Dear all, > > This week’s astronomy seminar will be on Friday June 1 at 10.30 in FC 61. Catherine Watkinson will speak about "Non-Gaussianity of 21-cm maps in the era of the SKA" > > abstract: > > Mapping the 21-cm line with the next generation of radio interferometers promises to dramatically advance our knowledge of the process of reionization, and the nature of the first stars and galaxies. > > However, even if we can overcome the observational challenges, 21-cm maps will not be straightforward to interpret. For example, the signal will be very non-Gaussian during both reionization, and an earlier phase during which the effects of Lyman-$\alpha$ coupling and X-ray heating dominate the signal. There are also strong degeneracies in the various parameters that can be used to model these physical processes. It is therefore essential that we look beyond the power spectrum, and exploit multiple statistical measures. > > > I will discuss the role that statistics like the bispectrum and skewness, both sensitive to non-Gaussianity in maps, will have to play in constraining the properties of the first stars and galaxies. In doing so I will cover a fast method for measuring the bispectrum. I will also discuss the observational prospects for the bispectrum and skewness. > > > cheers, > Angela & Jorrit > > Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Tue Jun 5 13:46:13 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 5 Jun 2018 13:46:13 +0200 Subject: [Astronomy seminar] Astronomy seminar on Friday June 8 at 13.30 in FC 61 Message-ID: Dear all, This week’s seminar will be on Friday, June 8 at 13.30 (NOTE THE DIFFERENT TIME!) in FC61. The speaker is our own Esha Kundu, who will speak about "Radio emission from supernovae and its applications" Abstract: The interaction of supernova (SN) ejecta with the circumstellar medium (CSM) drives a strong shock wave into the CSM. These shocks are ideal places where effective particle acceleration and magnetic field amplification can take place. The accelerated relativistic particles, in the presence of magnetic field, could emit part of their energy via synchrotron radiation in radio wavelengths. The flux of this radiation is roughly proportional to the density of the particle in the ambient medium, which, in general, is shaped by the strong winds from the pre-SN star. Therefore, by studying radio emission one can trace the mass loss history of the progenitor star, and consequently can obtain important clues about the nature and the evolution of the star before explosion. In this talk, I will present a detailed modeling of the radio emission from supernovae and demonstrate how this study has enabled us to put tight constraint on the possible progenitor systems of two very nearby SNe type Ia, SN 2014J and SN 2011fe. It is found from our analysis that both 14J and 11fe were exploded in a tenuous medium, which makes it possible to rule out most of the progenitor channels, for these two SNe, which may lead the formation of a dense CSM. In the second part of my talk, I will focus on SNe type IIb and discuss how we are investigating the evolution of yellow supergiants by performing late time radio modeling of two core collapse SNe, SNe 1993J and 2011dh. Cheers, Angela & Jorrit Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Fri Jun 8 12:40:33 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 8 Jun 2018 12:40:33 +0200 Subject: [Astronomy seminar] REMINDER: Astronomy seminar today at 13.30 in FC 61 Message-ID: Dear all, At 13.30, Esha Kundu will give this week's astronomy seminar in FC61. Title: Radio emission from supernovae and its applications Abstract: The interaction of supernova (SN) ejecta with the circumstellar medium (CSM) drives a strong shock wave into the CSM. These shocks are ideal places where effective particle acceleration and magnetic field amplification can take place. The accelerated relativistic particles, in the presence of magnetic field, could emit part of their energy via synchrotron radiation in radio wavelengths. The flux of this radiation is roughly proportional to the density of the particle in the ambient medium, which, in general, is shaped by the strong winds from the pre-SN star. Therefore, by studying radio emission one can trace the mass loss history of the progenitor star, and consequently can obtain important clues about the nature and the evolution of the star before explosion. In this talk, I will present a detailed modeling of the radio emission from supernovae and demonstrate how this study has enabled us to put tight constraint on the possible progenitor systems of two very nearby SNe type Ia, SN 2014J and SN 2011fe. It is found from our analysis that both 14J and 11fe were exploded in a tenuous medium, which makes it possible to rule out most of the progenitor channels, for these two SNe, which may lead the formation of a dense CSM. In the second part of my talk, I will focus on SNe type IIb and discuss how we are investigating the evolution of yellow supergiants by performing late time radio modeling of two core collapse SNe, SNe 1993J and 2011dh. Cheers, Angela & Jorrit Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Thu Jun 14 15:00:16 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Thu, 14 Jun 2018 15:00:16 +0200 Subject: [Astronomy seminar] No astronomy seminar this week Message-ID: Dear all, The astronomy seminar planned for tomorrow has been postponed to after the summer break. cheers, Jorrit & Angela Jorrit Leenaarts - Institutet för solfysik - Stockholms Universitet - phone: +46 85537 8550 From seminars-announce.astro-at-su.se at lists.su.se Wed Aug 29 19:06:56 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Wed, 29 Aug 2018 17:06:56 +0000 Subject: [Astronomy seminar] Astronomy seminar Friday 31/09 at 10:30 in FC61 Message-ID: Dear all, thanks to the prompt reply of Prof. Erb we have actually managed to schedule an excellent seminar for this coming Friday. Dr. Lluis Mas-Ribas has recently got his PhD in Oslo University and will move in a couple of weeks in California where he will start a post-doc a Caltech. He is visiting our Institute and will be around Thursday and Friday in case you are interested in talking to him. We hope you can make it! Title and abstract will follow. The agenda of our seminars is currently being updated on the www.astro.su.se webpage. We are experiencing difficulties in using the Albanova agenda, but it will be fixed soon. Kind regards, Alexis and Angela TITLE - Extended Diffuse Emission as a Probe of Galaxy and Reionization Physics ABSTRACT Two of the main questions for the Epoch or Reionzation are: (i) what sources reionized the Universe? and (ii) what is the escape fraction of ionizing photons from galaxies into the IGM? I will present our results demonstrating the use of the spatially extended Lya, Ha, and stellar continuum emission observed around star-forming galaxies from z~2 and up to z~7, and its comparison to future feasible JWST observations, to answer these two questions. Furthermore, I will show our recent calculations that indicate the JWST observability of the warm and hot CGM gas via the Thomson scattering of quasar radiation in massive galaxies, which appears to be redshift independent and thus enables measurements of the warm and hot halo gas properties, the baryonic content, and the impact of quasar feedback from z~0 to (at least) z~6.5 during Reionization. ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- From seminars-announce.astro-at-su.se at lists.su.se Fri Aug 31 08:30:22 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 31 Aug 2018 06:30:22 +0000 Subject: [Astronomy seminar] Reminder: Astronomy seminar today at 10:30 in FC61 In-Reply-To: <0EC56D0B-0E91-4A79-8F4B-4E4B7FF38B38@astro.su.se> References: <0EC56D0B-0E91-4A79-8F4B-4E4B7FF38B38@astro.su.se> Message-ID: A kind reminder of today seminar. Alexis and Angela ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- > On 29 Aug 2018, at 19:06, Angela Adamo wrote: > > Dear all, > thanks to the prompt reply of Prof. Erb we have actually managed to schedule an excellent seminar for this coming Friday. > Dr. Lluis Mas-Ribas has recently got his PhD in Oslo University and will move in a couple of weeks in California where he will start a post-doc a Caltech. > He is visiting our Institute and will be around Thursday and Friday in case you are interested in talking to him. > > We hope you can make it! Title and abstract will follow. > The agenda of our seminars is currently being updated on the www.astro.su.se webpage. > We are experiencing difficulties in using the Albanova agenda, but it will be fixed soon. > > Kind regards, > Alexis and Angela > > TITLE - Extended Diffuse Emission as a Probe of Galaxy and Reionization Physics > > ABSTRACT > Two of the main questions for the Epoch or Reionzation are: (i) what sources reionized the Universe? and (ii) what is the escape fraction of ionizing > photons from galaxies into the IGM? I will present our results demonstrating the use of the spatially extended Lya, Ha, and stellar continuum emission > observed around star-forming galaxies from z~2 and up to z~7, and its comparison to future feasible JWST observations, to answer these two questions. > Furthermore, I will show our recent calculations that indicate the JWST observability of the warm and hot CGM gas via the Thomson scattering of quasar > radiation in massive galaxies, which appears to be redshift independent and thus enables measurements of the warm and hot halo gas properties, the > baryonic content, and the impact of quasar feedback from z~0 to (at least) z~6.5 during Reionization. > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > From seminars-announce.astro-at-su.se at lists.su.se Wed Sep 12 11:17:26 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Wed, 12 Sep 2018 11:17:26 +0200 Subject: [Astronomy seminar] Seminar on Friday 14/9: Cristina Barbarino Message-ID: When & where: Friday 2018-09-14 at 10:30 in FC61. Who: Cristina Barbarino, Dept. of Astronomy, SU Title: Stripped Envelope Supernovae from (i)PTF Abstract: Stripped envelope supernovae (SESNe) are the result of the collapse of a massive star whose outer layer of hydrogen has been partially or completely removed. Two main scenario have been proposed for the progenitor channel: a single massive star or a binary system. They represent a quite rare class of supernovae (~34% of core-collapse) and only in the recent time with the upcoming of several surveys it was possible to build up a sample of objects being statistically significant. In this scenario, the Palomar Transient Factory (PTF) and the intermediate PTF (iPTF) bring their contributions; infact, unlike all their predecessors, those were untargeted surveys. The surveys took place through the use, mainly, of the P48 and P60 telescopes at the Palomar Observatory but several other facilities were involved to implement the collected data set (e.g. P200, NOT, LCOGT, Keck, Gemini...) on the window of time 2009-2016. These surveys have been a forerunner for the upcoming Zwicky Transient Facility (ZTF) which already saw its first light and will be fully operative in early 2018. I will present the SNe Ib/c sample found from PTF and iPTF. The analysis is mainly focused on the photometric dataset, in order to estimate the explosion parameters and to investigate the progenitor system. All welcome! Angela & Alexis, Astronomy seminar organisers From seminars-announce.astro-at-su.se at lists.su.se Fri Sep 14 05:11:23 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 14 Sep 2018 05:11:23 +0200 Subject: [Astronomy seminar] Seminar today: Cristina Barbarino In-Reply-To: References: Message-ID: On 2018-09-12 14:10, Alexis Brandeker wrote: > When & where: Friday 2018-09-14 at 10:30 in FC61. > > Who: Cristina Barbarino, Dept. of Astronomy, SU > > Title: Stripped Envelope Supernovae from (i)PTF > > Abstract: > Stripped envelope supernovae (SESNe) are the result of the collapse of a > massive star whose outer layer of hydrogen has been partially or > completely removed. Two main scenario have been proposed for the > progenitor channel: a single massive star or a binary system. They > represent a quite rare class of supernovae (~34% of core-collapse) and > only in the recent time with the upcoming of several surveys it was > possible to build up a sample of objects being statistically > significant. In this scenario, the Palomar Transient Factory (PTF) and > the intermediate PTF (iPTF) bring their contributions; infact, unlike > all their predecessors, those were untargeted surveys. The surveys took > place through the use, mainly, of the P48 and P60 telescopes at the > Palomar Observatory but several other facilities were involved to > implement the collected data set (e.g. P200, NOT, LCOGT, Keck, > Gemini...) on the window of time 2009-2016. These surveys have been a > forerunner for the upcoming Zwicky Transient Facility (ZTF) which > already saw its first light and will be fully operative in early 2018. I > will present the SNe Ib/c sample found from PTF and iPTF. The analysis > is mainly focused on the photometric dataset, in order to estimate the > explosion parameters and to investigate the progenitor system. > > All welcome! > > Angela & Alexis, Astronomy seminar organisers > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Sep 17 21:25:38 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 17 Sep 2018 19:25:38 +0000 Subject: [Astronomy seminar] Astronomy seminar Friday 21/09 at 10:30 in FC61 In-Reply-To: <0EC56D0B-0E91-4A79-8F4B-4E4B7FF38B38@astro.su.se> References: <0EC56D0B-0E91-4A79-8F4B-4E4B7FF38B38@astro.su.se> Message-ID: Dear all, welcome to our weekly seminar appointment Friday 21/09 at 10:30 am in FC61. The speaker is Anders Nyholm, from the astronomy department at SU. Title: Circumstellar matters: Probing star death and AGN host history via supernova surroundings Abstract: In my talk, I will discuss supernova (SN) research I have done for my PhD thesis. Type Ia (thermonuclear) SNe are sturdy rungs on the cosmic distance ladder, but no Type Ia progenitor system has yet been securely identified via observations. For nearby Type Ia SN 2014J we used the Nordic Optical Telescope to obtain a late spectrum of the SN, to search for hydrogen and helium ablated off a possible non-compact companion star. We put strong limits on the presence of such gas, making it plausible that the progenitor system was double-degenerate. Apart from this work, the rest of the thesis will be based on the intermediate Palomar Transient Factory (iPTF) survey. Using the iPTF SN catalogue, we examined the occurrence of SNe in active galactic nucleus (AGN) type 1 (broad Balmer lines) and type 2 (narrow Balmer lines) host galaxies. We found a larger number of SNe around AGN type 2 than around AGN type 1, and no core collapse (cc) SNe around AGN type 1. This result indicates that AGN type 2 hosts have younger stellar populations than AGN type 1 hosts. The main area of my PhD thesis work is SNe Type IIn, i.e. cc SNe happening in dense, hydrogen-rich circumstellar media. The interaction between SN ejecta and the circumstellar medium (CSM) can make SNe Type IIn luminous and long-lasting. In SNe IIn, as the ejecta sweeps up the CSM, the ejecta scans the late mass-loss history of the progenitor star. This offers rare glimpses of the last decades of supergiant stars. We studied Type IIn SN iPTF13z, with a long-lasting light curve showing several re-brightenings indicating that the SN ejecta ran into denser strata in the CSM. This, along with a clear detection of a pre-SN outburst, indicated that the iPTF13z progenitor star was restless before its demise. Such outbursts have been observed for a number of SNe Type IIn, offering clues about the progenitor stars. We currently work on a sample study of SNe IIn, using iPTF data, to improve our knowledge of this diverse class of transients. The agenda of our seminars is currently being updated on the www.astro.su.se webpage. We are experiencing difficulties in using the Albanova agenda, but it will be fixed soon. Kind regards, Alexis and Angela ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- On 29 Aug 2018, at 19:06, Angela Adamo > wrote: Dear all, thanks to the prompt reply of Prof. Erb we have actually managed to schedule an excellent seminar for this coming Friday. Dr. Lluis Mas-Ribas has recently got his PhD in Oslo University and will move in a couple of weeks in California where he will start a post-doc a Caltech. He is visiting our Institute and will be around Thursday and Friday in case you are interested in talking to him. We hope you can make it! Title and abstract will follow. The agenda of our seminars is currently being updated on the www.astro.su.se webpage. We are experiencing difficulties in using the Albanova agenda, but it will be fixed soon. Kind regards, Alexis and Angela TITLE - Extended Diffuse Emission as a Probe of Galaxy and Reionization Physics ABSTRACT Two of the main questions for the Epoch or Reionzation are: (i) what sources reionized the Universe? and (ii) what is the escape fraction of ionizing photons from galaxies into the IGM? I will present our results demonstrating the use of the spatially extended Lya, Ha, and stellar continuum emission observed around star-forming galaxies from z~2 and up to z~7, and its comparison to future feasible JWST observations, to answer these two questions. Furthermore, I will show our recent calculations that indicate the JWST observability of the warm and hot CGM gas via the Thomson scattering of quasar radiation in massive galaxies, which appears to be redshift independent and thus enables measurements of the warm and hot halo gas properties, the baryonic content, and the impact of quasar feedback from z~0 to (at least) z~6.5 during Reionization. ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Sep 21 07:44:59 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 21 Sep 2018 07:44:59 +0200 Subject: [Astronomy seminar] Reminder: Astronomy seminar Today at 10:30 in FC61 In-Reply-To: <3E1F28CD-F007-475B-A47B-DC00EB2B5B11@astro.su.se> References: <0EC56D0B-0E91-4A79-8F4B-4E4B7FF38B38@astro.su.se> <3E1F28CD-F007-475B-A47B-DC00EB2B5B11@astro.su.se> Message-ID: A kind reminder of today seminar. Angela > On 17 Sep 2018, at 21:25, Angela Adamo wrote: > > Dear all, > welcome to our weekly seminar appointment Friday 21/09 at 10:30 am in FC61. > The speaker is Anders Nyholm, from the astronomy department at SU. > > > Title: Circumstellar matters: Probing star death and AGN host history via supernova surroundings > > Abstract: In my talk, I will discuss supernova (SN) research I have done for my PhD thesis. Type Ia (thermonuclear) SNe are sturdy rungs on the cosmic distance ladder, but no Type Ia progenitor system has yet been securely identified via observations. For nearby Type Ia SN 2014J we used the Nordic Optical Telescope to obtain a late spectrum of the SN, to search for hydrogen and helium ablated off a possible non-compact companion star. We put strong limits on the presence of such gas, making it plausible that the progenitor system was double-degenerate. Apart from this work, the rest of the thesis will be based on the intermediate Palomar Transient Factory (iPTF) survey. Using the iPTF SN catalogue, we examined the occurrence of SNe in active galactic nucleus (AGN) type 1 (broad Balmer lines) and type 2 (narrow Balmer lines) host galaxies. We found a larger number of SNe around AGN type 2 than around AGN type 1, and no core collapse (cc) SNe around AGN type 1. This result indicates that AGN type 2 hosts have younger stellar populations than AGN type 1 hosts. The main area of my PhD thesis work is SNe Type IIn, i.e. cc SNe happening in dense, hydrogen-rich circumstellar media. The interaction between SN ejecta and the circumstellar medium (CSM) can make SNe Type IIn luminous and long-lasting. In SNe IIn, as the ejecta sweeps up the CSM, the ejecta scans the late mass-loss history of the progenitor star. This offers rare glimpses of the last decades of supergiant stars. We studied Type IIn SN iPTF13z, with a long-lasting light curve showing several re-brightenings indicating that the SN ejecta ran into denser strata in the CSM. This, along with a clear detection of a pre-SN outburst, indicated that the iPTF13z progenitor star was restless before its demise. Such outbursts have been observed for a number of SNe Type IIn, offering clues about the progenitor stars. We currently work on a sample study of SNe IIn, using iPTF data, to improve our knowledge of this diverse class of transients. > >> The agenda of our seminars is currently being updated on the www.astro.su.se webpage. >> We are experiencing difficulties in using the Albanova agenda, but it will be fixed soon. > > Kind regards, > Alexis and Angela > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > >> On 29 Aug 2018, at 19:06, Angela Adamo wrote: >> >> Dear all, >> thanks to the prompt reply of Prof. Erb we have actually managed to schedule an excellent seminar for this coming Friday. >> Dr. Lluis Mas-Ribas has recently got his PhD in Oslo University and will move in a couple of weeks in California where he will start a post-doc a Caltech. >> He is visiting our Institute and will be around Thursday and Friday in case you are interested in talking to him. >> >> We hope you can make it! Title and abstract will follow. >> The agenda of our seminars is currently being updated on the www.astro.su.se webpage. >> We are experiencing difficulties in using the Albanova agenda, but it will be fixed soon. >> >> Kind regards, >> Alexis and Angela >> >> TITLE - Extended Diffuse Emission as a Probe of Galaxy and Reionization Physics >> >> ABSTRACT >> Two of the main questions for the Epoch or Reionzation are: (i) what sources reionized the Universe? and (ii) what is the escape fraction of ionizing >> photons from galaxies into the IGM? I will present our results demonstrating the use of the spatially extended Lya, Ha, and stellar continuum emission >> observed around star-forming galaxies from z~2 and up to z~7, and its comparison to future feasible JWST observations, to answer these two questions. >> Furthermore, I will show our recent calculations that indicate the JWST observability of the warm and hot CGM gas via the Thomson scattering of quasar >> radiation in massive galaxies, which appears to be redshift independent and thus enables measurements of the warm and hot halo gas properties, the >> baryonic content, and the impact of quasar feedback from z~0 to (at least) z~6.5 during Reionization. >> >> >> ------------------------------------------------------- >> Angela Adamo >> >> Department of Astronomy >> Stockholm University and Oskar Klein Centre >> SE-10691 Stockholm - Sweden >> tel: +46 (0)8 5537 8556 >> email: angela.adamo at astro.su.se >> http://ttt.astro.su.se/~adamo >> ------------------------------------------------------- >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Oct 1 09:21:33 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 1 Oct 2018 09:21:33 +0200 Subject: [Astronomy seminar] Astronomy seminar Friday 5/10 at 10:30 in FC61 Message-ID: Speaker: Stephanie Yardley (University of St. Andrews) When/where: Friday October 5 at 10:30 in FC61 (Astronomy corridor, 6th floor) Title:Simulating the coronal evolution and eruption of bipolar active regions Abstract: To gain a better understanding of the formation and evolution of the pre-eruptive structure of CMEs requires the direct measurement of the coronal magnetic field, which is currently very difficult. An alternative approach, such as the simulation of the photospheric magnetic field must be used to infer the pre-eruptive magnetic structure and coronal evolution prior to eruption. The evolution of the coronal magnetic field of a small sub-set of bipolar active regions is simulated by applying the magnetofrictonal relaxation technique of Mackay et al. (2011). A sequence of photospheric line-of-sight magnetograms produced by SDO/HMI are used to drive the simulation and continuously evolve the coronal magnetic field of the active regions through a series of non-linear force-free equilibria. The simulation is started during the first stages of active region emergence so that the full evolution from emergence to decay can be simulated. A comparison of the simulation results with SDO/AIA observations show that many aspects of the observed coronal evolution of the active regions can be reproduced, including the majority of eruptions associated with the regions. Stephanie will be around on Wednesday and Thursday as well. Contact her host Tine Libbrecht if you want to schedule a meeting. All welcome! From seminars-announce.astro-at-su.se at lists.su.se Fri Oct 5 09:22:35 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 5 Oct 2018 09:22:35 +0200 Subject: [Astronomy seminar] Astronomy seminar TODAY at 10:30 in FC61 In-Reply-To: <4fb585e6-fb4e-28ba-cd33-a49c532ebe66@astro.su.se> References: <4fb585e6-fb4e-28ba-cd33-a49c532ebe66@astro.su.se> Message-ID: On 2018-10-01 09:21, Alexis Brandeker wrote: > Speaker: Stephanie Yardley (University of St. Andrews) > > When/where: Friday October 5 at 10:30 in FC61 (Astronomy corridor, 6th > floor) > > Title:Simulating the coronal evolution and eruption of bipolar active > regions > > Abstract: > To gain a better understanding of the formation and evolution of the > pre-eruptive structure of CMEs requires the direct measurement of the > coronal magnetic field, which is currently very difficult. An > alternative approach, such as the simulation of the photospheric > magnetic field must be used to infer the pre-eruptive magnetic structure > and coronal evolution prior to eruption. The evolution of the coronal > magnetic field of a small sub-set of bipolar active regions is simulated > by applying the magnetofrictonal relaxation technique of Mackay et al. > (2011). A sequence of photospheric line-of-sight magnetograms produced > by SDO/HMI are used to drive the simulation and continuously evolve the > coronal magnetic field of the active regions through a series of > non-linear force-free equilibria. The simulation is started during the > first stages of active region emergence so that the full evolution from > emergence to decay can be simulated. A comparison of the simulation > results with SDO/AIA observations show that many aspects of the observed > coronal evolution of the active regions can be reproduced, including the > majority of eruptions associated with the regions. > > Stephanie will be around on Wednesday and Thursday as well. Contact her > host Tine Libbrecht if you want to schedule > a meeting. > > All welcome! > > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Sun Oct 7 20:26:37 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Sun, 7 Oct 2018 18:26:37 +0000 Subject: [Astronomy seminar] Next Friday Astro seminar Oct 12 @10:30 in FC61 Message-ID: Dear all, welcome to the next astro seminar appointment. The speaker of this week is Prof. Jonathan Tan from Chalmers University of Technology & the Univ. of Virginia. The seminar will be in room FC61 on Friday 12th of October at 10:30 am. Title and abstract are included below and now available on the albanova agenda. Kind regards, Angela & Alexis https://www.albanova.se/event/inside-out-planet-formation/ Inside-Out Planet Formation Abstract: The Kepler-discovered systems with tightly-packed inner planets (STIPs), typically with several planets of Earth to super-Earth masses on well-aligned, sub-AU orbits may host the most common type of planets in the Galaxy. They pose a great challenge for planet formation theories, which fall into two broad classes: (1) formation in the outer disk followed by inward migration; (2) formation in situ. I review the pros and cons of these classes, before focusing on a new theory of sequential in situ formation from the inside-out via creation of successive gravitationally unstable rings fed from a continuous stream of small (~cm-m size) "pebbles," drifting inward via gas drag. Pebbles first collect at the pressure trap associated with the transition from a magnetorotational instability (MRI)-inactive ("dead zone") region to an inner MRI-active zone. A pebble ring builds up until it either becomes gravitationally unstable to form an Earth to super-Earth-mass planet directly or induces gradual planet formation via core accretion. The planet continues to accrete until it becomes massive enough to isolate itself from the accretion flow via gap opening. The process repeats with a new pebble ring gathering at the new pressure maximum associated with the retreating dead-zone boundary. I discuss the theory’s predictions for planetary masses, relative mass scalings with orbital radius, and minimum orbital separations, and their comparison with observed systems. Finally I speculate about potential causes of diversity of planetary system architectures, i.e. STIPs versus Solar System analogs. ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Oct 12 08:32:28 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 12 Oct 2018 06:32:28 +0000 Subject: [Astronomy seminar] Reminder: Today Astro seminar @10:30 in FC61 In-Reply-To: References: Message-ID: FYI On 07 Oct 2018, at 20:26, Angela Adamo > wrote: Dear all, welcome to the next astro seminar appointment. The speaker of this week is Prof. Jonathan Tan from Chalmers University of Technology & the Univ. of Virginia. The seminar will be in room FC61 on Friday 12th of October at 10:30 am. Title and abstract are included below and now available on the albanova agenda. Kind regards, Angela & Alexis https://www.albanova.se/event/inside-out-planet-formation/ Inside-Out Planet Formation Abstract: The Kepler-discovered systems with tightly-packed inner planets (STIPs), typically with several planets of Earth to super-Earth masses on well-aligned, sub-AU orbits may host the most common type of planets in the Galaxy. They pose a great challenge for planet formation theories, which fall into two broad classes: (1) formation in the outer disk followed by inward migration; (2) formation in situ. I review the pros and cons of these classes, before focusing on a new theory of sequential in situ formation from the inside-out via creation of successive gravitationally unstable rings fed from a continuous stream of small (~cm-m size) "pebbles," drifting inward via gas drag. Pebbles first collect at the pressure trap associated with the transition from a magnetorotational instability (MRI)-inactive ("dead zone") region to an inner MRI-active zone. A pebble ring builds up until it either becomes gravitationally unstable to form an Earth to super-Earth-mass planet directly or induces gradual planet formation via core accretion. The planet continues to accrete until it becomes massive enough to isolate itself from the accretion flow via gap opening. The process repeats with a new pebble ring gathering at the new pressure maximum associated with the retreating dead-zone boundary. I discuss the theory’s predictions for planetary masses, relative mass scalings with orbital radius, and minimum orbital separations, and their comparison with observed systems. Finally I speculate about potential causes of diversity of planetary system architectures, i.e. STIPs versus Solar System analogs. ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Tue Oct 16 09:23:08 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 16 Oct 2018 09:23:08 +0200 Subject: [Astronomy seminar] Astronomy seminar Friday 19/10 at 10:30 in FC61 In-Reply-To: References: <4fb585e6-fb4e-28ba-cd33-a49c532ebe66@astro.su.se> Message-ID: Speaker: Johan Pires Bjørgen (Inst. for Solar Physics, Dept. of Astronomy, SU) When/where: Friday October 19 at 10:30 in FC61 (Astronomy corridor, 6th floor) Title: The synthetic chromosphere Abstract: The solar chromosphere is a dynamic layer between the photosphere and corona. Only few and complex spectral lines can probe the chromosphere making its observations a real challenge. To gain insight into the chromospheric physical conditions, we can compare the observations with 3D radiation-magnetohydrodynamic models combined with forward modeling (radiative transfer). The chromospheric environment is strongly influenced by departures from local thermodynamic equilibrium (non-LTE), horizontal radiative transfer (3D effects), and partially-coherent scattering of photons (partial redistribution effects). All these effects make the detailed 3D non-LTE radiative transfer very computationally demanding. In this seminar, I will focus on the chromospheric resonance lines Ca II H&K. Understanding their formation is crucial to interpret the observations from the new imaging spectrometer CHROMIS, recently installed at the Swedish 1-m Solar Telescope. In our work, we modelled the Ca II H&K lines in 3D by using simulations of a quiet Sun and active region containing sunspots and a solar flare. For the quiet Sun, we investigated how the synthetic observables of Ca II H&K lines are related to atmospheric parameters. Aside from the theoretical interpretation of synthetic spectral lines, I will also discuss how to solve the non-local thermodynamic equilibrium radiative transfer problem more efficiently. All welcome! From seminars-announce.astro-at-su.se at lists.su.se Fri Oct 19 06:00:38 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 19 Oct 2018 06:00:38 +0200 Subject: [Astronomy seminar] Astronomy seminar TODAY at 10:30 in FC61 In-Reply-To: <49e81d97-89c4-d3f0-906b-3a65c0231851@astro.su.se> References: <4fb585e6-fb4e-28ba-cd33-a49c532ebe66@astro.su.se> <49e81d97-89c4-d3f0-906b-3a65c0231851@astro.su.se> Message-ID: Speaker: Johan Pires Bjørgen (Inst. for Solar Physics, Dept. of Astronomy, SU) When/where: Friday October 19 at 10:30 in FC61 (Astronomy corridor, 6th floor) Title: The synthetic chromosphere Abstract: The solar chromosphere is a dynamic layer between the photosphere and corona. Only few and complex spectral lines can probe the chromosphere making its observations a real challenge. To gain insight into the chromospheric physical conditions, we can compare the observations with 3D radiation-magnetohydrodynamic models combined with forward modeling (radiative transfer). The chromospheric environment is strongly influenced by departures from local thermodynamic equilibrium (non-LTE), horizontal radiative transfer (3D effects), and partially-coherent scattering of photons (partial redistribution effects). All these effects make the detailed 3D non-LTE radiative transfer very computationally demanding. In this seminar, I will focus on the chromospheric resonance lines Ca II H&K. Understanding their formation is crucial to interpret the observations from the new imaging spectrometer CHROMIS, recently installed at the Swedish 1-m Solar Telescope. In our work, we modelled the Ca II H&K lines in 3D by using simulations of a quiet Sun and active region containing sunspots and a solar flare. For the quiet Sun, we investigated how the synthetic observables of Ca II H&K lines are related to atmospheric parameters. Aside from the theoretical interpretation of synthetic spectral lines, I will also discuss how to solve the non-local thermodynamic equilibrium radiative transfer problem more efficiently. All welcome! -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Oct 22 20:31:50 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 22 Oct 2018 20:31:50 +0200 Subject: [Astronomy seminar] Astronomy seminar Friday 26/10 at 10:30 in FC61 In-Reply-To: References: <4fb585e6-fb4e-28ba-cd33-a49c532ebe66@astro.su.se> <49e81d97-89c4-d3f0-906b-3a65c0231851@astro.su.se> Message-ID: Speaker: Tine Libbrecht (Inst. for Solar Physics, Dept. of Astronomy, SU) When/where: Friday October 26 at 10:30 in FC61 (Astronomy corridor, 6th floor) Title: Exploring the diagnostic value of He I D3 in the solar chromosphere Abstract: The research question of my PhD is in a way a simple one: what can observations of the He I D3 line teach us about the solar chromosphere? This optical spectral line at 5876 Å is formed in the upper chromosphere, and is sensitive to the local magnetic field and to heating of the transition region and corona. In order to explain why, I will discuss the unconventional formation mechanism of He I D3. This line was a commonly used diagnostic for the solar chromosphere in the 70's for flares and later also for prominences. However, the spatial resolution of the data available is very poor compared to what we can achieve today at for example the SST. During my PhD, I have focused on high-resolution observations of He I D3 with different instruments at the SST, and in co-observation with space-borne instruments. These observations have provided new insights in the reconnection events that we have studied. Our He I D3 observations have set constraints on the temperature of Ellerman Bombs (EBs, i.e. tiny reconnection events in the upper photosphere) - which is relevant in the context of chromospheric heating. Currently, 3D radiative transfer calculations are undertaken with the goal of understanding helium line formation in small-scale reconnection events. In the context of flares, we measured strong downflows in the chromosphere via He I D3, revealing shocks and dynamics during a flare. Spectro-polarimetry was used to measure the magnetic field during a flare and to propose its magnetic topology. In summary, the He I D3 line is an excellent probe for high-energy processes in the chromosphere and many possible applications are yet to be exploited. All welcome! From seminars-announce.astro-at-su.se at lists.su.se Fri Oct 26 08:59:39 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 26 Oct 2018 08:59:39 +0200 Subject: [Astronomy seminar] Astronomy seminar TODAY at 10:30 in FC61 In-Reply-To: <6315c738-517f-7d42-9dbb-15fb4e17785b@astro.su.se> References: <4fb585e6-fb4e-28ba-cd33-a49c532ebe66@astro.su.se> <49e81d97-89c4-d3f0-906b-3a65c0231851@astro.su.se> <6315c738-517f-7d42-9dbb-15fb4e17785b@astro.su.se> Message-ID: Speaker: Tine Libbrecht (Inst. for Solar Physics, Dept. of Astronomy, SU) When/where: Friday October 26 at 10:30 in FC61 (Astronomy corridor, 6th floor) Title: Exploring the diagnostic value of He I D3 in the solar chromosphere Abstract: The research question of my PhD is in a way a simple one: what can observations of the He I D3 line teach us about the solar chromosphere? This optical spectral line at 5876 Å is formed in the upper chromosphere, and is sensitive to the local magnetic field and to heating of the transition region and corona. In order to explain why, I will discuss the unconventional formation mechanism of He I D3. This line was a commonly used diagnostic for the solar chromosphere in the 70's for flares and later also for prominences. However, the spatial resolution of the data available is very poor compared to what we can achieve today at for example the SST. During my PhD, I have focused on high-resolution observations of He I D3 with different instruments at the SST, and in co-observation with space-borne instruments. These observations have provided new insights in the reconnection events that we have studied. Our He I D3 observations have set constraints on the temperature of Ellerman Bombs (EBs, i.e. tiny reconnection events in the upper photosphere) - which is relevant in the context of chromospheric heating. Currently, 3D radiative transfer calculations are undertaken with the goal of understanding helium line formation in small-scale reconnection events. In the context of flares, we measured strong downflows in the chromosphere via He I D3, revealing shocks and dynamics during a flare. Spectro-polarimetry was used to measure the magnetic field during a flare and to propose its magnetic topology. In summary, the He I D3 line is an excellent probe for high-energy processes in the chromosphere and many possible applications are yet to be exploited. All welcome! From seminars-announce.astro-at-su.se at lists.su.se Tue Nov 6 21:40:19 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 6 Nov 2018 20:40:19 +0000 Subject: [Astronomy seminar] Next astro seminar the 09/11 at 10:30 in FC61 Message-ID: Dear all, welcome to the next seminar which will take place on Friday the 9th of November at 10:30 in FC61. The speaker of this week is Prof. David Kaplan from UW-Milwaukee. David is currently visiting our astronomy department for an extend period of a few months. Title and abstract follow below and can also be found in the Albanova agenda. https://www.albanova.se/event/astronomy-seminar-the-geometry-energetics-and-environment-of-the-binary-neutron-star-merger-gw170817-the-radio-view/ Kind regards, Alexis and Angela The Geometry, Energetics, and Environment of the Binary Neutron Star Merger GW170817: The Radio View I will discuss the major uncertainties regarding the geometry, energetics, and environment of the first EM/GW binary neutron star merger GW170817. In particular I will look at the origin of the radio emission, how it differs from the early-time optical/infrared emission, and what that tells us about how the explosion proceeded. I will show how constraints from the radio lightcurve, polarization, and Very Long Baseline Interferometry helped provide evidence for a broad, mildly relativistic "cocoon" along with a narrow jet. This broke degeneracies in the gravitational wave data analysis to provide inclination constraints and improved measurements of the Hubble Constant. ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- From seminars-announce.astro-at-su.se at lists.su.se Fri Nov 9 07:34:28 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 9 Nov 2018 07:34:28 +0100 Subject: [Astronomy seminar] Reminder: astro seminar today at 10:30 in FC61 In-Reply-To: <3DC80F51-BDD4-4DE7-AA1C-58299F13365F@astro.su.se> References: <3DC80F51-BDD4-4DE7-AA1C-58299F13365F@astro.su.se> Message-ID: A kind reminder of today seminar. Welcome Angela > On 6 Nov 2018, at 21:40, Angela Adamo wrote: > > Dear all, > welcome to the next seminar which will take place on Friday the 9th of November at 10:30 in FC61. > The speaker of this week is Prof. David Kaplan from UW-Milwaukee. > David is currently visiting our astronomy department for an extend period of a few months. > Title and abstract follow below and can also be found in the Albanova agenda. > https://www.albanova.se/event/astronomy-seminar-the-geometry-energetics-and-environment-of-the-binary-neutron-star-merger-gw170817-the-radio-view/ > > Kind regards, > Alexis and Angela > > The Geometry, Energetics, and Environment of the Binary Neutron Star > Merger GW170817: The Radio View > > I will discuss the major uncertainties regarding the geometry, > energetics, and environment of the first EM/GW binary neutron star > merger GW170817. In particular I will look at the origin of the radio > emission, how it differs from the early-time optical/infrared > emission, and what that tells us about how the explosion proceeded. I > will show how constraints from the radio lightcurve, polarization, and > Very Long Baseline Interferometry helped provide evidence for a broad, > mildly relativistic "cocoon" along with a narrow jet. This > broke degeneracies in the gravitational wave data analysis to provide > inclination constraints and improved measurements of the Hubble > Constant. > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Nov 19 06:38:56 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 19 Nov 2018 06:38:56 +0100 Subject: [Astronomy seminar] Astronomy seminar Friday 23/11 at 10:30 in FC61 Message-ID: Speaker: Heather Cegla (Geneva Observatory) When/where:  Friday November 23 at 10:30 in FC61 (Astronomy corridor, 6th floor) Title: Probing the surfaces of Sun-like stars using and 3D magnetohydrodynamical simulations and transiting planets Abstract: Inhomogeneities on stellar surfaces pose the fundamental stumbling block on the pathway to true Earth analogues. This is especially pertinent as we enter the era of 10 cm/s radial velocity (RV) precision, with spectrographs like ESPRESSO continuing to come online. From a spectroscopic point of view, manifestations of stellar activity (such as star-spots, plage/faculae, convective flows, and oscillations) alter the observed stellar line profiles. In turn, these time-variable line asymmetries can be mistakenly interpreted as whole-sale Doppler shifts that mask or mimic planetary signals. Here, I will focus on the impact of solar surface oscillations and magnetoconvection, as these ‘noise’ sources are present on even the (magnetically) quietest exoplanet host stars. I will demonstrate that we can bin down the pressure-mode oscillations to ~10 cm/s with an exposure time of just 5.4 minutes. Moreover, I will show how exposure times slightly larger than this can actually increase the noise level, and how even doubling the exposure time has little impact. In addition, I will show how magnetoconvection does not average out well over such timescales, and how its centre-to-limb dependence can impact exoplanet measurements. Using 3D solar MHD simulations as a backbone, I will explore both the oscillation and convective induced line shape changes, and demonstrate how these changes can be used to track the remaining convective noise. Hence, in the era of 10 cm/s RV precision, I will show that we should we be fine-tuning exposure times to our host star parameters, as well as exploiting the line profile characteristics to mitigate the astrophysical noise emanating from stellar convective envelopes. Alongside this, I will show how we can use transiting planets to probe and spatially resolve stellar surfaces, which in turn helps us to validate MHD simulations and determine 3D star-planet trajectories — that ultimately feed into planet formation, migration and evolution theories. We have successfully applied this new technique to HD 189733, as well as for Wasp-8, where we found previous results may have been biased. We have also shown this is an effective tool even for the coolest and slowest rotating stars, by determining the first obliquity for a (Neptune-mass) planet around a M dwarf (GJ 436). All welcome! -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Nov 23 04:37:56 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 23 Nov 2018 04:37:56 +0100 Subject: [Astronomy seminar] Astronomy seminar TODAY at 10:30 in FC61 In-Reply-To: <4a1d4060-0019-1851-b401-34ed6088b59b@astro.su.se> References: <4a1d4060-0019-1851-b401-34ed6088b59b@astro.su.se> Message-ID: In addition to the astronomy seminar today at 10:30, there will also be an astrobiology talk at 15:30 in FC61 (same location): "Limits on the lifespan of habitability of M-star planets", by Raymond T. Pierrehumbert (Oxford). On 2018-11-19 06:38, Alexis Brandeker wrote: > Speaker: Heather Cegla (Geneva Observatory) > > When/where:  Friday November 23 at 10:30 in FC61 (Astronomy corridor, > 6th floor) > > Title: Probing the surfaces of Sun-like stars using and 3D > magnetohydrodynamical simulations and transiting panets > > Abstract: > Inhomogeneities on stellar surfaces pose the fundamental stumbling > block on the pathway to true Earth analogues. This is especially > pertinent as we enter the era of 10 cm/s radial velocity (RV) > precision, with spectrographs like ESPRESSO continuing to come online. > From a spectroscopic point of view, manifestations of stellar activity > (such as star-spots, plage/faculae, convective flows, and > oscillations) alter the observed stellar line profiles. In turn, these > time-variable line asymmetries can be mistakenly interpreted as > whole-sale Doppler shifts that mask or mimic planetary signals. Here, > I will focus on the impact of solar surface oscillations and > magnetoconvection, as these ‘noise’ sources are present on even the > (magnetically) quietest exoplanet host stars. I will demonstrate that > we can bin down the pressure-mode oscillations to ~10 cm/s with an > exposure time of just 5.4 minutes. Moreover, I will show how > exposure times slightly larger than this can actually increase the > noise level, and how even doubling the exposure time has little > impact. In addition, I will show how magnetoconvection does not > average out well over such timescales, and how its centre-to-limb > dependence can impact exoplanet measurements. Using 3D solar MHD > simulations as a backbone, I will explore both the oscillation and > convective induced line shape changes, and demonstrate how these > changes can be used to track the remaining convective noise. Hence, in > the era of 10 cm/s RV precision, I will show that we should we be > fine-tuning exposure times to our host star parameters, as well as > exploiting the line profile characteristics to mitigate the > astrophysical noise emanating from stellar convective envelopes. > Alongside this, I will show how we can use transiting planets to probe > and spatially resolve stellar surfaces, which in turn helps us to > validate MHD simulations and determine 3D star-planet trajectories — > that ultimately feed into planet formation, migration and evolution > theories. We have successfully applied this new technique to HD > 189733, as well as for Wasp-8, where we found previous results may > have been biased. We have also shown this is an effective tool even > for the coolest and slowest rotating stars, by determining the first > obliquity for a (Neptune-mass) planet around a M dwarf (GJ 436). > > All welcome! > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Tue Nov 27 21:21:02 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 27 Nov 2018 20:21:02 +0000 Subject: [Astronomy seminar] Astronomy seminar Friday 30th of November at 10:30 in FC61 Message-ID: Dear all, next astronomy seminar will take place Friday 30th of November at 10:30 in FC61. The speaker of this week is Matteo Messa from Stockholm University. Title and abstract are included and available on the Allbanova agenda. Kind regards, Angela & Alexis https://www.albanova.se/event/astronomy-seminar-young-star-clusters-and-clumps-in-the-local-universe-the-effect-of-galactic-environment-on-star-formation/ Title: Young star clusters and clumps in the local Universe – The effect of galactic environment on star-formation Abstract: Stars do not form in isolation, but rather out of a hierarchical structure set by the turbulence of the interstellar medium. At the densest peak of the gas distribution, the star formation process can produce young star clusters (YSCs), gravitationally bound systems of stars with mass between ~100 and 10^5 M_sun and typical size of few parsecs. At larger scales, clusters are themselves arranged into cluster complexes, on scales of hundred parsecs and up to kiloparsec scales, which are usually referred to as star-forming clumps. Observations of local star-forming galaxies show that YSCs form over a wide range of galactic environment. However, it is not yet clear if and how the galactic environment relates to the properties of star clusters. I will present the results obtained by studying the YSC population of the nearby spiral galaxy M51. We find that the cluster mass function can be described by a power-law with a -2 slope and an exponential truncation at 10^5 M_sun, consistently to what observed in similar galaxies in the literature. The shape of the mass function is similar when looking at increasing galactocentric distances. We observe significant differences, however, when comparing clusters located in the spiral arm and the inter-arm environments. On average, more massive clusters are formed in the spiral arms, as also previously found for the YSC progenitors, the giant molecular clouds (GMCs). Finally we see that clusters are more quickly disrupted in denser environment, as expected if their disruption is mainly caused by tidal interaction with dense gas structures like the GMCs. I have also undertaken the analysis of the interplay between galactic scale properties and larger star forming units, the stellar clumps. The analysis has been conducted in a sample of 14 local starburst galaxies, the Lyman-Alpha Reference Sample (LARS). The elevated star formation rate densities of such galaxies allow to form clumps with densities comparable to clumps at high-redshift, typically more massive and denser than what normally observed in the local universe. The clumps in the LARS galaxies contribute to a large fraction (in many galaxies >50%) to the UV flux of the galaxy itself, resulting in galaxies which appear ‘clumpy’. In agreement with formation theories we observe that clumpiness is higher in galaxies with higher SFR surface density and dominated by turbulent gas motion. ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Nov 30 08:15:55 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 30 Nov 2018 08:15:55 +0100 Subject: [Astronomy seminar] Reminder: Astronomy seminar Today at 10:30 in FC61 In-Reply-To: References: Message-ID: A kind reminder of today seminar. Angela > On 27 Nov 2018, at 21:21, Angela Adamo wrote: > > Dear all, > next astronomy seminar will take place Friday 30th of November at 10:30 in FC61. > > The speaker of this week is Matteo Messa from Stockholm University. > > Title and abstract are included and available on the Allbanova agenda. > > Kind regards, > Angela & Alexis > > > > https://www.albanova.se/event/astronomy-seminar-young-star-clusters-and-clumps-in-the-local-universe-the-effect-of-galactic-environment-on-star-formation/ > > >> Title: >> Young star clusters and clumps in the local Universe – The effect of galactic environment on star-formation >> >> Abstract: >> Stars do not form in isolation, but rather out of a hierarchical structure set by the turbulence of the interstellar medium. At the densest peak of the gas distribution, the star formation process can produce young star clusters (YSCs), gravitationally bound systems of stars with mass between ~100 and 10^5 M_sun and typical size of few parsecs. At larger scales, clusters are themselves arranged into cluster complexes, on scales of hundred parsecs and up to kiloparsec scales, which are usually referred to as star-forming clumps. Observations of local star-forming galaxies show that YSCs form over a wide range of galactic environment. However, it is not yet clear if and how the galactic environment relates to the properties of star clusters. I will present the results obtained by studying the YSC population of the nearby spiral galaxy M51. We find that the cluster mass function can be described by a power-law with a -2 slope and an exponential truncation at 10^5 M_sun, consistently to what observed in similar galaxies in the literature. The shape of the mass function is similar when looking at increasing galactocentric distances. We observe significant differences, however, when comparing clusters located in the spiral arm and the inter-arm environments. On average, more massive clusters are formed in the spiral arms, as also previously found for the YSC progenitors, the giant molecular clouds (GMCs). Finally we see that clusters are more quickly disrupted in denser environment, as expected if their disruption is mainly caused by tidal interaction with dense gas structures like the GMCs. I have also undertaken the analysis of the interplay between galactic scale properties and larger star forming units, the stellar clumps. The analysis has been conducted in a sample of 14 local starburst galaxies, the Lyman-Alpha Reference Sample (LARS). The elevated star formation rate densities of such galaxies allow to form clumps with densities comparable to clumps at high-redshift, typically more massive and denser than what normally observed in the local universe. The clumps in the LARS galaxies contribute to a large fraction (in many galaxies >50%) to the UV flux of the galaxy itself, resulting in galaxies which appear ‘clumpy’. In agreement with formation theories we observe that clumpiness is higher in galaxies with higher SFR surface density and dominated by turbulent gas motion. > > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Tue Dec 11 12:08:06 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Tue, 11 Dec 2018 11:08:06 +0000 Subject: [Astronomy seminar] Next Astronomy Seminar Friday 14th of Nov at 10:30 in FC61 Message-ID: Dear all, welcome to the next astronomy seminar which will take place as usual on Friday at 10:30 in the lecture room FC61. The speaker of this week is Ylva Götberg from the University of Amsterdam. The title and abstract are published in the albanova agenda and included here below to this email. Kind regards, Angela & Alexis https://www.albanova.se/event/astronomy-seminar-stripped-massive-stars-nearby-and-over-cosmic-history/ Stripped massive stars — nearby and over cosmic history About a third of massive stars lose their hydrogen-rich envelopes through mass exchange with a companion star; a process that completely changes the life of the star. Instead of growing large, cool and red, the star becomes small, hot and blue since it now only consists of the exposed helium core. The deaths of stripped stars are also different from their single star counterparts. While a massive single star explodes as a hydrogen-rich supernova, most stripped stars explode as stripped-envelope supernovae (type Ib/c) and a fraction of them form the double neutron star systems the merge in gravitational wave events. Because stripped stars are so hot, they emit a large fraction of their radiation as ionizing, which makes them a stellar source of ionizing radiation that rarely is accounted for when modeling feedback from stellar populations. I will focus on the ionizing properties of stripped stars. I will start on a small scale and describe how we used detailed evolutionary and spectral models to identify candidate stripped stars. We combine the detailed models with population synthesis to estimate the contribution from stripped stars to the integrated spectra of stellar populations. The models show a delayed emission of ionizing radiation because stripped stars are formed over an extended period in time. The late ionizing emission mimics the presence of massive stars and can affect the determination of mass and age of galaxies and stellar clusters. When accounting for the ionizing emission from stripped stars over cosmic history, we discovered that stripped stars could have been one of the main sources that drove the reionization of the Universe. ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Dec 14 08:39:31 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 14 Dec 2018 08:39:31 +0100 Subject: [Astronomy seminar] Reminder: Next Astronomy Seminar Today at 10:30 in FC61 In-Reply-To: References: Message-ID: A kind reminder of today seminar. Angela > On 11 Dec 2018, at 12:08, Angela Adamo wrote: > > Dear all, > welcome to the next astronomy seminar which will take place as usual on Friday at 10:30 in the lecture room FC61. > The speaker of this week is Ylva Götberg from the University of Amsterdam. > > The title and abstract are published in the albanova agenda and included here below to this email. > > Kind regards, > Angela & Alexis > > https://www.albanova.se/event/astronomy-seminar-stripped-massive-stars-nearby-and-over-cosmic-history/ > > > Stripped massive stars — nearby and over cosmic history > > > About a third of massive stars lose their hydrogen-rich envelopes through mass exchange with a companion star; a process that completely changes the life of the star. Instead of growing large, cool and red, the star becomes small, hot and blue since it now only consists of the exposed helium core. The deaths of stripped stars are also different from their single star counterparts. While a massive single star explodes as a hydrogen-rich supernova, most stripped stars explode as stripped-envelope supernovae (type Ib/c) and a fraction of them form the double neutron star systems the merge in gravitational wave events. Because stripped stars are so hot, they emit a large fraction of their radiation as ionizing, which makes them a stellar source of ionizing radiation that rarely is accounted for when modeling feedback from stellar populations. > > I will focus on the ionizing properties of stripped stars. I will start on a small scale and describe how we used detailed evolutionary and spectral models to identify candidate stripped stars. We combine the detailed models with population synthesis to estimate the contribution from stripped stars to the integrated spectra of stellar populations. The models show a delayed emission of ionizing radiation because stripped stars are formed over an extended period in time. The late ionizing emission mimics the presence of massive stars and can affect the determination of mass and age of galaxies and stellar clusters. When accounting for the ionizing emission from stripped stars over cosmic history, we discovered that stripped stars could have been one of the main sources that drove the reionization of the Universe. > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Mon Dec 17 22:35:11 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Mon, 17 Dec 2018 21:35:11 +0000 Subject: [Astronomy seminar] Astronomy seminar Friday 21st of December at 10:30 in FC61 Message-ID: Dear all, welcome to the last astronomy seminar of the year on Friday 21st of December at 10:30 in FC61. The speaker of this week is Dr. Carl-Johan Haster from MIT Kavli Institute for Astrophysics and Space Research. Title and abstract are available on the link to the albanova agenda and here below. https://www.albanova.se/event/astronomy-seminar-gravitational-wave-observations-of-merging-black-holes-and-neutron-stars-inferring-object-and-population-properties/ We will start again in January. Stay tuned for new and exciting science in 2019! We wish you all a pleasant holiday break. Angela and Alexis “Gravitational wave observations of merging black holes and neutron stars - inferring object and population properties” There is now an unprecedented population of eleven observations of gravitational waves detected by the LIGO and Virgo observatories during their first and second observing runs. I will present recent results detailing these individual gravitational sources, what they can tell us about the nature of General Relativity as well as how they give us a first glimpse of a hidden population of black holes. I will also highlight the observation of the merger of two neutron stars, and how the latest gravitational wave analysis is capable of shedding further light on this golden event. ------------------------------------------------------- Angela Adamo Department of Astronomy Stockholm University and Oskar Klein Centre SE-10691 Stockholm - Sweden tel: +46 (0)8 5537 8556 email: angela.adamo at astro.su.se http://ttt.astro.su.se/~adamo ------------------------------------------------------- -------------- next part -------------- An HTML attachment was scrubbed... URL: From seminars-announce.astro-at-su.se at lists.su.se Fri Dec 21 09:13:02 2018 From: seminars-announce.astro-at-su.se at lists.su.se (Astronomy seminar announcements) Date: Fri, 21 Dec 2018 09:13:02 +0100 Subject: [Astronomy seminar] Reminder: Astronomy seminar Today at 10:30 in FC61 In-Reply-To: References: Message-ID: A kind reminder! Last seminar of the year! Angela > On 17 Dec 2018, at 22:35, Angela Adamo wrote: > > Dear all, > welcome to the last astronomy seminar of the year on Friday 21st of December at 10:30 in FC61. > The speaker of this week is Dr. Carl-Johan Haster from MIT Kavli Institute for Astrophysics and Space Research. > > Title and abstract are available on the link to the albanova agenda and here below. > https://www.albanova.se/event/astronomy-seminar-gravitational-wave-observations-of-merging-black-holes-and-neutron-stars-inferring-object-and-population-properties/ > > > We will start again in January. Stay tuned for new and exciting science in 2019! > We wish you all a pleasant holiday break. > > Angela and Alexis > > > “Gravitational wave observations of merging black holes and neutron stars - inferring object and population properties” > > There is now an unprecedented population of eleven observations of gravitational waves detected by the LIGO and Virgo observatories during their first and second observing runs. I will present recent results detailing these individual gravitational sources, what they can tell us about the nature of General Relativity as well as how they give us a first glimpse of a hidden population of black holes. I will also highlight the observation of the merger of two neutron stars, and how the latest gravitational wave analysis is capable of shedding further light on this golden event. > > > ------------------------------------------------------- > Angela Adamo > > Department of Astronomy > Stockholm University and Oskar Klein Centre > SE-10691 Stockholm - Sweden > tel: +46 (0)8 5537 8556 > email: angela.adamo at astro.su.se > http://ttt.astro.su.se/~adamo > ------------------------------------------------------- > -------------- next part -------------- An HTML attachment was scrubbed... URL: