The wind and the magnetospheric accretion onto the T Tauri star S Coronae Australis at sub-au resolution - Observatoire de Paris Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2017

The wind and the magnetospheric accretion onto the T Tauri star S Coronae Australis at sub-au resolution

R. Garcia Lopez
  • Function : Author
A. Caratti O Garatti
J. Sanchez-Bermudez
W. Brandner
J. Garcia
  • Function : Author
Th. Henning
A. Amorim
  • Function : Author
N. Anugu
  • Function : Author
J. Berger
  • Function : Author
H. Bonnet
  • Function : Author
A. Buron
  • Function : Author
P. Caselli
W. de Wit
  • Function : Author
C. Deen
  • Function : Author
F. Delplancke-Ströbele
  • Function : Author
J. Dexter
A. Eckart
C. Garcia
  • Function : Author
X. Haubois
  • Function : Author
M. Haug
  • Function : Author
F. Haussmann
  • Function : Author
S. Hippler
S. Kellner
  • Function : Author
M. Kulas
  • Function : Author
J. Kolb
  • Function : Author
S. Lacour
B. Le Bouquin
  • Function : Author
M. Lippa
  • Function : Author
E. Müller
  • Function : Author
T. Ott
J. Panduro
  • Function : Author
A. Ramírez
  • Function : Author
  • PersonId : 952179
C. Rau
  • Function : Author
R. Rohloff
  • Function : Author
S. Scheithauer
  • Function : Author
W. Thi
  • Function : Author
E. van Dishoeck
I. Waisberg
  • Function : Author
I. Wank
  • Function : Author
E. Wieprecht
  • Function : Author
M. Wiest
  • Function : Author
J. Woillez
S. Yazici
  • Function : Author

Abstract

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.
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Dates and versions

obspm-02190736 , version 1 (13-10-2020)

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R. Garcia Lopez, K. Perraut, A. Caratti O Garatti, B. Lazareff, J. Sanchez-Bermudez, et al.. The wind and the magnetospheric accretion onto the T Tauri star S Coronae Australis at sub-au resolution. Astronomy and Astrophysics - A&A, 2017, 608, pp.A78. ⟨10.1051/0004-6361/201731058⟩. ⟨obspm-02190736⟩
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