S17
Atelier général du Programme National de Physique Stellaire (PNPS)
Communauté
Contact : Kévin Belkacem
L’atelier s’articulera autour des 4 thèmes prioritaires du PNPS :
– Origines : formation stellaire et disques proto-planétaires ;
– Champ magnétique et activité stellaire : origine, nature et effet dans tout le diagramme HR ; importance pour la recherche et la caractérisation des exoplanètes ;
– Evolution/Intérieurs/Atmosphères : transport, oscillations, paramètres fondamentaux, perte de masse, multiplicité
– Interaction : étoile-planète ; étoile-disque ; étoile-étoile.s ; étoile-environnement (galactique) ; et des thèmes transverses :
– Astrophysique de laboratoire : expérience de laboratoire/ simulations numériques / big data ;
– Synergies de méthodes : focus sur objets prototypiques, benchmarks.
Les présentations seront de 15 minutes (+ 5 mintutes de questions) et se feront préférentiellement en français (les diaporamas seront eux écrits en anglais).
Comité d’organisation : Kevin Belkacem, Nadège Meunier, Orlagh Creevey, Joao Marques, Anaelle Maury
Posters
| Horaires | Contributions | Orateurs |
|---|---|---|
| 14h00-14h20 | The GRAVITY view of the innermost regions of protoplanetary disks | K. Perraut |
| 14h20-14h40 | A landscape of main sequence star activity | L. Degott |
| 14h40-15h00 | How do (massive) binary stars form? | R. Mignon-Risse |
| 15h00-15h20 | The scientific projects of the Interferometric Survey for Stellar Parameters with SPICA/CHARA | R. Ligi |
| 15h20-15h40 | Nebular spectra from Type Ia supernova explosion models compared to JWST observations of SN 2021aefx | S. Blondin |
| 15h40-16h00 | Vents magnétiques dans les disques de transition | E. Martel |
| 16h00-16h20 | Secular stability of dipolar magnetic binaries | C. Aykroyd |
| 16h20-16h40 | PAUSE | PAUSE |
| 16h40-17h00 | HAYDN: High-precision AsteroseismologY of DeNse stellar fields | B. Mosser |
| 17h00-17h20 | mm/submm Dust Polarization as a Tracer of the Magnetic Field in Protostellar Envelopes | V. Valdivia |
| 17h20-17h40 | Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and radiative hydrodynamics simulations | E. Béguin |
| 17h40-18h00 | A magnetic field study in the envelope of cool evolved stars | L. Marinho |
| 18h00-18h20 | A new 12C+12C reaction rate from the STELLA collaboration: how to determine astrophysical parameters with nuclear experiments? | E. Monpribat |
| 18h20-18h40 | Convection, overshooting et ondes internes dans les étoiles: simulations numériques multi-dimensionnelles. | I. Baraffe |
Présentations
| Authors | Title | Type | File |
|---|---|---|---|
| Béguin Elysabeth, Laboratoire Lagrange, Observatoire de Côte d\'Azur, Nice (PhD student et présentatrice) Chiavassa Andrea, Laboratoire Lagrange, Observatoire de Côte d\'Azur, Nice Ahmad Arief, Département de Physique et d\'Astronomie, Université d\'Uppsala, Suède (PhD student) Freytag Bernd, Département de Physique et d\'Astronomie, Université d\'Uppsala, Suède Uttenthaler Stefan, Observatoire Kuffner, Vienne, Autriche | Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and radiative hydrodynamics simulations | orale | Abstract_Beguin_SF2A_PNPS_2023.pdf |
| Jonah Mauxion | Étudier l\\\\\\\'évolution séculaire des disques protoplanétaires enfouis | poster | abstract.pdf |
| Valeska Valdivia, Anaëlle Maury & Patrick Hennebelle | mm/submm Dust Polarization as a Tracer of the Magnetic Field in Protostellar Envelopes | orale | SF2A_Valdivia_V_abstract_oral.pdf |
| K. Perraut and GRAVITY Collaboration | The GRAVITY view of the innermost regions of protoplanetary disks | orale | Abstract-SF2A.pdf |
| Anthony Soulain, Karine Perraut, Jérôme Bouvier, Benjamin Tessore, ERC-SPIDI-team | Probing the inner disk and magnetospheric accretion region of CI Tau with VLTI/GRAVITY | poster | abstract_citau_2023.pdf |
| Anthony Soulain | Interferometry with the JWST (AMI): first results and exoplanets potential | poster | abstract_JWST_short.pdf |
| T. Dumont, E. Monpribat, M. Heine, A. Bonhomme, J. Nippert, S. Courtin | Improving stellar modeling with new precise nuclear reaction rates determined from nuclear experiment | poster | Abstract_Dumont_Nuclear.pdf |
| T. Dumont | Exploring surface abundance of lithium from Main-Sequence to Red giant phase with the constraint of angular momentum transport | poster | Abstract_Dumont_Lithium.pdf |
| Véronique Bommier | Échappement thermique des électrons à l\'intérieur du Soleil et des Étoiles (Electron thermal escape inside Sun and Stars) | poster | abstract-VB.pdf |
| Louise Marinho, Fabrice Herpin, Helmut Wiesemeyer, Arturo Lopèz-Ariste, Alain Baudry, Andrés Asensio Ramos and the PEPPER team | A magnetic field study in the envelope of cool evolved stars | orale | abstract_sf2a_marinho_1.pdf |
| Sylvain N. Breton Antonino F. Lanza Sergio Messina | Rotation of solar-type stars in the PLATO era: combining asteroseismology and active-region diagnostics | poster | Abstract SF2A_1.pdf |
| Leïla Bessila, Stéphane Mathis | The influence of magnetism on the stochastic excitation of acoustic modes in solar-type stars | poster | Leïla Bessila - The influence of magnetism on the stochastic excitation of acoustic modes in solar-type stars.pdf |
| Marc-Antoine Martinod (KU Leuven) Denis Defrère (KU Leuven) Michael Ireland (ANU) Frantz Martinache (OCA) Stefan Kraus (UofEx) Asgard Consortium | High-angular and high-contrast VLTI observations from Y to L band with the Asgard instrumental suite | poster | Abstract_SF2A_2023_S17_martinod.pdf |
| Marc-Antoine Martinod (KU Leuven) Denis Defrère (KU Leuven) Michael Ireland (ANU) Frantz Martinache (OCA) Stefan Kraus (UofEx) Asgard Consortium | High-angular and high-contrast VLTI observations from Y to L band with the Asgard instrumental suite | poster | Abstract_SF2A_2023_S17_martinod_1.pdf |
| Louis Amard, Stéphane Mathis | Gravity waves in the magnetised radiative core of low-mass stars : consequences for asteroseismology and transport of angular momentum | poster | Abstract_SF2A2023.pdf |
| Halbwachs J.-L., Kiefer F., Lebreton Y., Arenou F., Famaey B., Guillout P., Mazeh T., Pourbaix D., Salomon J.-B. | Masses et luminosités de composantes de SB2 déduites d\\\\\\\'observations à l\\\\\\\'OHP et des orbites astrométriques de la Gaia-DR3 | poster | S17-Halbwachs.pdf |
| I. Baraffe | Convection, overshooting et ondes internes dans les étoiles: simulations numériques multi-dimensionnelles. | orale | Titre_presentation.pdf |
| Raphaël Mignon-Risse (CNES/APC), Matthias González (U. Paris Cité/AIM), Benoît Commerçon (CRAL) | How do (massive) binary stars form? | orale | abstract_S17_1.pdf |
| Alexis Lavail | CRIRES+, a high-resolution near-infrared spectro(polari)meter at the 8m Very Large Telescope | poster | alexislavail-abstract-pnps-crires.pdf |
| Étienne Martel, Geoffroy Lesur | Vents magnétiques dans les disques de transition | poster | abstract_SF2A_2023_1.pdf |
| Lisa Bugnet | Probing magnetic fields inside the core of red giants from mixed-mode period spacings | poster | Abstract_SF2A_2023_1.pdf |
| Antoine Alaguero, Cuello Nicolás, Simone Ceppi | Planet formation in triple systems : the case of V892 Tau | poster | V892Tau _SF2A2023.pdf |
| Stéphane Blondin | Nebular spectra from Type Ia supernova explosion models compared to JWST observations of SN 2021aefx | orale | abstract_sblondin.pdf |
| Soubiran, C. et al. | The Gaia FGK Benchmark Stars: fundamental (Teff, logg) of the extended sample | poster | abstract_SF2A.pdf |
| Gonzague Radureau, Claire Michaut, Andrew I. Comport, Romain Drouilly | Utilisation de l’intelligence artificielle pour améliorer les performances de simulations d\'hydrodynamique radiative | poster | abstract_SF2A_Gonzague_Radureau_1.pdf |
| Benoit Mosser, HAYDN consortium | HAYDN: High-precision AsteroseismologY of DeNse stellar fields | orale | haydn_sf2a.pdf |
| Baptiste Klein | Comprendre et modéliser les déformations induites par l\\\'activité magnétique dans les raies d\\\'absorption du Soleil | poster | BKlein_SF2A_2023.pdf |
| Christopher Aykroyd, Adrien Bourgoin, Christophe Le Poncin-Lafitte, Stéphane Mathis, Marie-Christine Angonin | Secular stability of dipolar magnetic binaries | orale | Aykroyd_SF2A.pdf |
| Paul Cristofari, J.-F. Donati, C. P. Folsom et al. | Modeling SPIRou spectra with ZeeTurbo: an application to 6 magnetic M dwarfs. | poster | abstract_6.pdf |
| Ezequiel González, Bertrand Goldman, María Rosa Zapatero Osorio, Víctor Javier Sánchez Bejar, Thomas Henning, Jan Pitann | Studying brown dwarf dust cloud distribution through polarisation | poster | Gonzalez E - SF2A 23 - Abstract.pdf |
| M. Faurobert, T. Corbard, B. Gelly, R. Douet, D. Laforgue | Mise en évidence d\\\'un fort gradient radial de rotation dans la photosphère solaire | poster | resumeSF2A.pdf |
| Arthur Le Saux | Exploring waves properties with multi-dimensional fully compressible hydrodynamical simulations: from solar type stars to intermediate-mass stars | poster | abstract_SF2A_4.pdf |
| Maxime Roumesy Ryo Tazaki François Ménard | Les mystères de la poussière dans les disques protoplanétaires | poster | Abstract_Maxime_ROUMESY.pdf |
| Lucie Degott Frédéric Baudin Réza Samadi Cilia Damiani Barbara Perri | A landscape of main sequence star activity | orale | talk_2023.pdf |
| Sun-like stars are thought to accrete most of their final mass during the protostellar phase, where the protostellar embryo is surrounded by an infalling dense envelope. The so-called Class 0 phase designates the youngest protostellar stage, where the accretion is the most vigorous. Because these objects are highly embedded, it is difficult to retrieve direct diagnostics from the accretion, whose observational imprint lie at small wavelengths, in the near-infrared and below. Therefore, little is known about the accretion mechanisms occurring in the Class 0 phase because of high extinction. However, in rare cases the blueshifted cavity created by the outflow is sufficiently close to pole-on to liberate enough near-infrared scattered light for us to probe the immediate surroundings of the central object. We present a new set of K-band spectra of 18 Class 0 protostars recently observed with Keck MOSFIRE. Br$_\\\\gamma$, several H$_2$ and $\\\\Delta\\\\,\\\\nu\\\\;=\\\\;2$ CO lines are detected and analyzed. We detect Br$_\\\\gamma$ in 9 sources, which suggests a good fraction but not all of Class 0s accrete via magnetospheric accretion. The H$_2$ lines are consistent with shock excitation indicating jets/outflows. Stella CO lines are seen in absorption in 2 sources suggesting recent vigorous accretion episodes. CO is seen in emission in 10 sources, tracing the heated inner accretion disk. We find that a significant higher fraction of Class 0 objects tend to exhibit CO in emission than in archival K-band spectra of later-evolved, Class I protostars. We also perform and discuss statistical tests comparing the near-IR line parameters of Class 0 and I objects. Our results suggest that the near-IR accretion properties of Class 0s tend to be different that of Class I objects. Studying the infalling structures of the Class 0 sub-millimeter envelopes alongside their near-IR Spectra, we find that one source presenting a large accretion streamer and disorganized density structures could have recently undergone an accretion burst. Upcoming JWST observations shall constrain further the accretion mechanisms of Class 0 protostars. | Accretion properties of Class 0 protostars studied with near-infrared spectroscopy | poster | Abstract_VLG.pdf |
| T. Ravinet, C. Reylé, A. Burgasser, R. L. Smart, J. G. Fernández-Trincado, and W. H. Moya | Near-infrared spectroscopic follow-up of Gaia ultra-cool dwarfs candidates | poster | TRavinet_SF2A_abstract.pdf |
| C. Pinçon & M. Takata | A star seen as a multi-cavity acoustic interferometer: a novel approach to develop seismic diagnostic | poster | mulit.pdf |
| C. Pinçon & L. Petitdemange | Wave-rotation interaction close to the radiative-convective boundaries in stars : revisiting a model of the Quasi-Biennal Oscillation in the Earth stratosphere. | poster | SLO.pdf |
| Aurélie Astoul, Adrian Barker | Do non-linear effects disrupt tidal dissipation estimates in convective envelopes? | poster | abstract_sf2a_2023_2.pdf |
| Emma Monpribat | A new 12C+12C reaction rate from the STELLA collaboration: how to determine astrophysical parameters with nuclear experiments? | orale | abstract_monpribat.pdf |
| R. Ligi, D. Mourard (PI), and all the ISSP team. | The scientific projects of the Interferometric Survey for Stellar Parameters with SPICA/CHARA | orale | abstract_sf2a_1.pdf |
| Romain Lenoble, Joakim Rosdahl, Benoit Commercon | Formation of the first stars: collapse and fragmentation of primordial gas clouds. | poster | abstract_10.pdf |
| Armand Leclerc, Guillaume Laibe, Nicolas Perez, Antoine Venaille, Pierre Delplace | Topological modes in stellar oscillations | poster | Poster_asterosismotopo.pdf |
| Benjamin Thomasson, Isabelle Joncour, Estelle Moraux | The origin of the IMF and multiplicity in small stellar groups | poster | abstract_thomasson_pnps.pdf |
| Laurine Martinien, François Ménard, Ryo Tazaki | PDS 453 : un disque edge-on intéressant | poster | MARTINIEN_S17.pdf |