RSS feedhttps://phys.au.dk/sac/past-eventsdaThu, 28 Mar 2024 14:58:39 +0100Thu, 28 Mar 2024 14:58:39 +0100TYPO3 EXT:newsnews-71199Mon, 13 Mar 2023 11:00:00 +0100Thesis Defence - Emil Knudstruphttps://phys.au.dk/en/news/item/artikel/thesis-defence-emil-knudstrupNatur og teknologiInstitut for Fysik og AstronomiMedarbejdereOffentligheden / PressenStuderendeBrigitte Christina HendersonMon, 13 Mar 2023 11:00:00 +0100Tue, 21 Mar 2023 12:30:00 +01001525-3231525-3231678701600167939820016787016001679398200news-68745Thu, 27 Oct 2022 10:00:00 +0200SAC Seminar - Simon Murphy, University of Sydneyhttps://phys.au.dk/sac/sac-seminars/article/artikel/sac-seminar-simon-murphy-university-of-sydneyTitle: Precise asteroseismic ages from young pulsating stars

Abstract:
The ages of stars are notoriously difficult to determine, especially for young stars that are still shrouded in dust or surrounded by discs. Here, every Myr matters, as we try to probe the processes of planet formation and stellar composition build-up. We typically rely on ensemble ages determined for clusters or associations, but age gradients, age dispersion, and methodological uncertainties limit the available accuracy. Even the Pleiades has age uncertainties close to 50%. I will discuss recent results from asteroseismology of pre-main-sequence delta Scuti pulsators, where age precisions of ~10% (~1 Myr) can be achieved, and results for main-sequence members of the Pleiades. I will describe the evolution of pulsation frequencies in young stars and how this allows masses and metallicities to be determined in a degeneracy-free way, permitting stellar associations to be dated with much better precision.

 

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Natur og teknologiInstitut for Fysik og AstronomiMedarbejdereOffentligheden / PressenStuderendeBrigitte Christina HendersonThu, 27 Oct 2022 10:00:00 +0200Thu, 27 Oct 2022 11:00:00 +02001666857600166686120016668576001666861200
news-67965Thu, 29 Sep 2022 10:30:00 +0200NTE Talk - Michael I. Andersen, NBIhttps://phys.au.dk/sac/sac-seminars/article/artikel/nte-talk-michael-i-andersen-nbiTitel:
Status on the NTE instrument for NOT

Abstract:
The design, projected performance and status of NTE (NOT Transient Explorer) is described. NTE is in reality three independent instruments mounted together at the Cassegrain focus of the NOT: NTE-VIS-imager, NTE-IR-imager and NTE-spectrograph. The two imagers can be used in parallel via a dichroic and provides a FoV of 6' with a sampling of 0.18"/pix. They are in performance very similar to AlFOsc and NOTCam, respectively. The NTE spectrograph is a cross-dispersed and covers the spectral range 320 nm - 2430 nm in a single exposure, through 18 spectral orders, with a 23" long slit. The spectrograph utilizes CCDs in the visible/UV and an H2RG detector from Teledyne in the IR, with plate scales of 0.23" and 0.40", respectively. NTE is expected to have first light in 2024.

 

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Natur og teknologiInstitut for Fysik og AstronomiMedarbejdereOffentligheden / PressenStuderendeBrigitte Christina HendersonThu, 29 Sep 2022 10:30:00 +0200Thu, 29 Sep 2022 11:30:00 +02001520-3161520-3161664440200166444380016644402001664443800
news-67471Wed, 14 Sep 2022 14:45:00 +0200Reception for Professor of Astrophysics Jørgen Christensen-Dalsgaard 14 September 2022https://phys.au.dk/sac/sac-seminars/article/artikel/reception-for-professor-of-astrophysics-joergen-christensen-dalsgaard-14-september-2022Professor of astrophysics Jørgen Christensen-Dalsgaard from Aarhus University will be the first Dane to receive the Norwegian Kavli Prize. To celebrate this event, the university cordially invites partners and staff to a reception.Natur og teknologiInstitut for Fysik og AstronomiAlumnerMedarbejdereOffentligheden / PressenStuderendeBrigitte Christina HendersonWed, 14 Sep 2022 14:45:00 +0200Wed, 14 Sep 2022 17:00:00 +0200Steno Museet, C. F. Møllers Allé 2, 8000 Aarhus C.Steno Museet, C. F. Møllers Allé 2, 8000 Aarhus C.1663159500166316760016631595001663167600news-67469Wed, 14 Sep 2022 11:45:00 +0200Follow-up meeting with the Danish National Research Foundationhttps://phys.au.dk/sac/sac-seminars/article/artikel/follow-up-meeting-with-the-danish-national-research-foundation-1Natur og teknologiInstitut for Fysik og AstronomiMedarbejdereOffentligheden / PressenStuderendeBrigitte Christina HendersonWed, 14 Sep 2022 11:45:00 +0200Wed, 14 Sep 2022 14:15:00 +02001525-6261525-6261663148700166315770016631487001663157700news-65532Wed, 29 Jun 2022 10:00:00 +0200Master's Thesis Defence - Mads Jørgensenhttps://phys.au.dk/sac/sac-seminars/article/artikel/masters-thesis-defence-mads-joergensenOn 29 June, at 10am, Mads Jørgensen will defend his thesis.

Title: Earth as an Exoplanet: Simulating the Spectrum of Earth Over Geological Time as a Proxy for Exoplanets at Different Evolutionary Stages

Supervisor: Simon Albrecht
Co-supervisor: Kai Finster
External Examiner: Uffe Graae Jørgensen, Niels Bohr Institute

Location: 1520-516
 

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Natur og teknologiInstitut for Fysik og AstronomiMedarbejdereOffentligheden / PressenStuderendeWed, 29 Jun 2022 10:00:00 +0200Wed, 29 Jun 2022 12:00:00 +02001520-5161520-5161656489600165649680016564896001656496800
news-64867Mon, 13 Jun 2022 08:00:00 +0200MW Gaia Workshop "Fundamental stellar parameters from asteroseismology in the era of Gaia", Aarhus 2022https://phys.au.dk/sac/sac-seminars/article/artikel/mw-gaia-workshop-fundamental-stellar-parameters-from-asteroseismology-in-the-era-of-gaia-aarhus-2022The aim of this workshop is to bring together experts on asteroseismology, galactic archaeology, stellar evolution, exoplanets, and Gaia data. Participants will discuss the synergies that combining Gaia data with datasets from Kepler and TESS offers, as well as the opportunities to eliminate the remaining stumbling blocks.By mid-2022 the Gaia DR3 catalogue will be released which will provide a wealth of information for more than a billion stars, including ultra-precise astrometry, radial velocities, photometric colours, binary solutions, etc. This new release will enable even more stringent astrophysical constraints when performing asteroseismic modelling to derive fundamental stellar parameters. This will push forward several asteroseismic applications such as exoplanet host star characterization and galactic archaeology.

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Natur og teknologiInstitut for Fysik og AstronomiMedarbejdereOffentligheden / PressenStuderendeMon, 13 Jun 2022 08:00:00 +0200Wed, 15 Jun 2022 16:10:00 +02001655100000165530220016551000001655302200
news-63863Thu, 02 Jun 2022 09:30:00 +0200Stagger Workshop 2 - 3 June 2022https://phys.au.dk/sac/sac-seminars/article/artikel/stagger-workshop-2-3-june-2022We are organising a two-day international scientific workshop at the Stellar Astrophysics Centre, Aarhus, Denmark, with the motivation for bringing together the community of core developers and users of the Stagger code.

Stagger is a first-rate numerical code designed for radiation-magnetohydrodynamics and computational astrophysical-flow simulations on high-performance computing (HPC) systems.

Programme

2 June 2022

  9:30-10:00               Welcome and introduction to the Stagger-code workshop
Speaker: Luisa Fernanda Rodríguez Díaz, Yixiao Zhou
10:00-10:30Coffee Break
10:30-11:10Stagger-grid: status and generation of models
Speaker: Luisa Fernanda Rodríguez Díaz
11:10-11:45Discussion
Chair:Yixiao Zhou
11:45-12:40Lunch
12:45-13:30Stagger model atmospheres with new microphysics
Speaker: Yixiao Zhou
13:30-14:15The end of the second cosmological lithium problem
Speaker: Thomas Nordlander
14:15-14:45Coffee Break
14:45-15:30Scaling relations of convective granulation noise across the HR diagram from 3D stellar atmosphere models
Speaker: Luisa Fernanda Rodríguez Díaz
15:30-16:45Discussion
Chair: Yixiao Zhou
18:30-Workshop Dinner

3 June 2022

  9:00- 9:45 “Stagger Code compatible modeling in the DISPATCH code
framework”

Speaker: Åke Nordlund
  9:45-10:30The Multi3D extension for DISPATCH: A task based approach to
NLTE radiative transfer

Speaker: Richard Hoppe
10:30-11:00Coffee Break
11:00-11:45Discussion
Chair: Luisa Fernanda Rodríguez Díaz
11:45-12:45Lunch
12:45-13:30NLTE solar composition and SSM with average 3D models
Speaker: Ekaterina Magg
13:30-14:153D NLTE stellar spectroscopy: past and future
Speaker: Karin Lind
14:15-14:45Coffee Break
14:45-15:30State of the art EOS for whole stars - including atmospheres
Speaker: Regner Trampedach
15:30-16:30Discussion and concluding remarks
Chair: Yixiao Zhou

List of participants:

  • Luisa Fernanda Rodríguez Díaz
    Stellar Astrophysics Centre (SAC), Aarhus University

  • Yixiao Zhou
    Stellar Astrophysics Centre (SAC), Aarhus University

  • Lionel Bigot
    Université Côte d'Azur

  • Maria Bergemann
    Max Planck Institute for Astronomy

  • Karin Lind
    Stockholm University

  • Regner Trampedach
    Space Science Institute

  • Åke Nordlund
    Centre for Star and Planet Formation, Niels Bohr Institute

  • Jakob Lysgaard Rørsted (Mosumgaard)
    Stellar Astrophysics Centre (SAC), Aarhus University

  • Cis Raf Lagae
    Stockholm University

  • Ekaterina Magg
    Max Planck Institute for Astronomy

  • Philipp Eitner
    Max Planck Institute for Astronomy

  • Thomas Nordlander
    Research School of Astronomy and Astrophysics, Australian National University

  • Richard Hoppe
    Max Planck Institute for Astronomy

  • Gloria Canocchi
    Stockholm University

  • Jack William Edmund Mallinson
    Stockholm University 

  • Hans-Günter Ludwig
    Universität Heidelberg

  • Jørgen Christensen-Dalsgaard
    Stellar Astrophysics Centre


Venue:                                                               
Aarhus University   
Department of Physics and Astronomy
Ny Munkegade 120, building 1520
8000 Aarhus C.
Meeting room: 1520-737


Practical Information:
The Department of Physics and Astronomy is situated in the west end of Campus, Aarhus University.
Please choose your favorite guide/map to find Campus, e.g. http://maps.google.dk/. The main entrance can be reached from Ny Munkegade/Langelandsgade.

Below, please find the campus map and how to find the Department of Physics and Astronomy
https://phys.au.dk/en/contact-us/finding-the-department-1

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WorkshopNatur og teknologiFaculty of Natural SciencesMedarbejdereOffentligheden / PressenThu, 02 Jun 2022 09:30:00 +0200Fri, 03 Jun 2022 17:00:00 +02001520-7371520-7371654155000165426840016541550001654268400
news-63366Thu, 21 Apr 2022 13:00:00 +0200PhD Defence - Camilla Clement Borre: The stars’ tales of Galactic collisions – a study of Galactic archaeology and asteroseismologyhttps://phd.nat.au.dk/about-us/currently/nyhed/artikel/the-stars-tales-of-galactic-collisions-a-study-of-galactic-archaeology-and-asteroseismologyThu, 21 Apr 2022 13:00:00 +0200Thu, 21 Apr 2022 15:00:00 +02001531-1191531-1191650538800165054600016505388001650546000news-62870Thu, 31 Mar 2022 13:00:00 +0200Qualifying exam - Mark Lykke Wintherhttps://phd.nat.au.dk/about-us/currently/show-events/artikel/qualifying-exam-full-3d-mhd-simulations-of-the-sunNatur, miljø og klimaFaglighedNatur og teknologiFaculty of Natural SciencesMedarbejdereOffentligheden / PressenStuderendeThu, 31 Mar 2022 13:00:00 +0200Thu, 31 Mar 2022 15:00:00 +02001525-6261525-6261648724400164873160016487244001648731600