| Title: |
The wind and the magnetospheric accretion onto the T Tauri star S Coronae Australis at sub-au resolution |
| Authors: |
Garcia Lopez, R.; Perraut, K.; Caratti O Garatti, A.; Lazareff, B.; Sanchez-Bermudez, J.; Benisty, M.; Dougados, C.; Labadie, L.; Brandner, W.; Garcia, J.; Henning, Th.; Ray, P.; Abuter, R.; Amorim, A.; Anugu, N.; Berger, J.; Bonnet, H.; Buron, A.; Caselli, P.; Clenet, Y.; Coudé Du Forestol, Vincent; de Wit, W.; Deen, C.; Delplancke-Ströbele, F.; Dexter, J.; Eckart, A.; Eisenhauer, F.; Garcia, C.; Gendron, E.; Genzel, R.; Gillessen, S.; Haubois, X.; Haug, M.; Haussmann, F.; Hippler, S.; Hubert, Z.; Hummel, A.; Horrobin, M.; Jocou, L.; Kellner, S.; Kervella, P.; Kulas, M.; Kolb, J.; Lacour, S.; Le Bouquin, B.; Lena, P.; Lippa, M.; Mérand, Antoine; Müller, E.; Ott, T.; Panduro, J.; Paumard, T.; Perrin, G.; Pfuhl, O.; Ramírez, A.; Rau, C.; Rohloff, R.; Rousset, G.; Scheithauer, S.; Scholler, M.; Straubmeier, C.; Sturm, E.; Thi, W.; van Dishoeck, E.; Vincent, F.; Waisberg, I.; Wank, I.; Wieprecht, E.; Wiest, M.; Wiezorrek, E.; Woillez, J.; Yazici, S.; Zins, G. |
| Contributors: |
Institut de Planétologie et d'Astrophysique de Grenoble (IPAG); Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG); Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 )-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ); European Southern Observatory (ESO); Max-Planck-Institut für Astronomie = Max Planck Institute for Astronomy (MPIA); Max-Planck-Gesellschaft; Institut Jean Le Rond d'Alembert (DALEMBERT); Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS); INAF- Osservatorio Astrofisico di Arcetri (OAA); Istituto Nazionale di Astrofisica Rome (INAF); Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA); Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris; Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS); Max-Planck-Institut für Radioastronomie (MPIFR); Max Planck Institute for Extraterrestrial Physics (MPE); Mayo Clinic Rochester; Galaxies, Etoiles, Physique, Instrumentation (GEPI); Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris; Laboratoire Transport et Environnement (INRETS/LTE); Institut National de Recherche sur les Transports et leur Sécurité (INRETS); Swedish Space Corporation (SSC); Departamento de Control Automático (CINVESTAV-IPN); Center for Research and Advanced Studies of the National Polytechnic Institute (CINVESTAV-IPN); DIAMOND Light source; Institut de biologie et chimie des protéines Lyon (IBCP); Université Claude Bernard Lyon 1 (UCBL); Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS); Universität zu Köln = University of Cologne; Leiden Observatory Leiden; Universiteit Leiden = Leiden University; GRAVITY Collaboration; ANR-10-LABX-0056,OSUG@2020,Innovative strategies for observing and modelling natural systems(2010) |
| Source: |
ISSN: 0004-6361. |
| Publisher Information: |
CCSD; EDP Sciences |
| Publication Year: |
2017 |
| Collection: |
Université Savoie Mont Blanc: HAL |
| Subject Terms: |
stars: formation; circumstellar matter; ISM: jets and outflows; ISM: individual objects: S CrA; infrared: ISM; techniques: interferometric; [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| Description: |
International audience ; Aims. To investigate the inner regions of protoplanetary discs, we performed near-infrared interferometric observations of the classical T Tauri binary system S CrA.Methods. We present the first VLTI-GRAVITY high spectral resolution (R ~ 4000) observations of a classical T Tauri binary, S CrA (composed of S CrA N and S CrA S and separated by ~1.̋4), combining the four 8m telescopes in dual-field mode. Results. Our observations in the near-infrared K-band continuum reveal a disc around each binary component, with similar half-flux radii of about 0.1 au at d ~ 130 pc, inclinations (i = 28 ± 3° and i = 22 ± 6°), and position angles (PA = 0°± 6° and PA = –2°± 12°), suggesting that they formed from the fragmentation of a common disc. The S CrA N spectrum shows bright He i and Brγ line emission exhibiting inverse P Cygni profiles, typically associated with infalling gas. The continuum-compensated Brγ line visibilities of S CrA N show the presence of a compact Brγ emitting region whose radius is about ~0.06 au, which is twice as big as the truncation radius. This component is mostly tracing a wind. Moreover, a slight radius change between the blue- and red-shifted Brγ line components is marginally detected.Conclusions. The presence of an inverse P Cygni profile in the He i and Brγ lines, along with the tentative detection of a slightly larger size of the blue-shifted Brγ line component, hint at the simultaneous presence of a wind and magnetospheric accretion in S CrA N. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1051/0004-6361/201731058 |
| Availability: |
https://hal-obspm.ccsd.cnrs.fr/obspm-02190736; https://hal-obspm.ccsd.cnrs.fr/obspm-02190736v1/document; https://hal-obspm.ccsd.cnrs.fr/obspm-02190736v1/file/aa31058-17.pdf; https://doi.org/10.1051/0004-6361/201731058 |
| Rights: |
https://about.hal.science/hal-authorisation-v1/ ; info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.9166C322 |
| Database: |
BASE |