The wind and the magnetospheric accretion onto the T Tauri star S Coronae Australis at sub-Au resolution
Garcia Lopez, R; Perraut, K; Caratti o Garatti, A; et al.Lazareff, B; Sanchez-Bermudez, J; Benisty, M; Dougados, C; Labadie, L; Brandner, W; Garcia, PJV; Henning, Th; Ray, TP; Abuter, R; Amorim, A; Anugu, N; Berger, JP; Bonnet, H; Buron, A; Caselli, P; Clénet, Y; Coudé du Foresto, V; de Wit, W; Deen, C; Delplancke-Ströbele, F; Dexter, J; Eckart, A; Eisenhauer, F; Garcia Dabo, CE; Gendron, E; Genzel, R; Gillessen, S; Haubois, X; Haug, M; Haussmann, F; Hippler, S; Hubert, Z; Hummel, CA; Horrobin, M; Jocou, L; Kellner, S; Kervella, P; Kulas, M; Kolb, J; Lacour, S; Le Bouquin, J-B; Léna, P; Lippa, M; Mérand, A; Müller, E; Ott, T; Panduro, J; Paumard, T; Perrin, G; Pfuhl, O; Ramirez, A; Rau, C; Rohloff, RR; Rousset, G; Scheithauer, S; Schöller, M; Straubmeier, C; Sturm, E; Thi, WF; van Dishoeck, E; Vincent, F; Waisberg, I; Wank, I; Wieprecht, E; Wiest, M; Wiezorrek, E; Woillez, J; Yazici, S; Zins, G
Date: 8 December 2017
Astronomy and Astrophysics
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 CrAN and S CrAS and separated ...
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 CrAN and S CrAS and separated by -10:04), 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 halfflux 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 CrAN spectrum shows bright He i and Br line emission exhibiting inverse P Cygni profiles, typically associated with infalling gas. The continuum-compensated Br line visibilities of S CrAN show the presence of a compact Br 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 Br line components is marginally detected. Conclusions. The presence of an inverse P Cygni profile in the He i and Br lines, along with the tentative detection of a slightly larger size of the blue-shifted Br line component, hint at the simultaneous presence of a wind and magnetospheric accretion in S CrA N.
Physics and Astronomy
College of Engineering, Mathematics and Physical Sciences
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