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

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Lopez, RG (Author) Other; Perraut, K (Author) Other; Garatti, ACO (Author) Other; Lazareff, B (Author) Other; Sanchez Bermudez, J (Author) Other; Benisty, M (Author) Other; Dougados, C (Author) Other; Labadie, L (Author) Other; Brandner, W (Author) Other; P. J. V. Garcia (Author) FEUP; Henning, T (Author) Other; Ray, TP (Author) Other; Abuter, R (Author) Other; Amorim, A (Author) Other; Anugu, N (Author) Other; Berger, JP (Author) Other; Bonnet, H (Author) Other; Buron, A (Author) Other; Caselli, P (Author) Other; Clenet, Y (Author) Other; du Foresto, VC (Author) Other; de Wit, W (Author) Other; Deen, C (Author) Other; Delplancke Stroebele, F (Author) Other; Dexter, J (Author) Other; Eckart, A (Author) Other; Eisenhauer, F (Author) Other; Dabo, CEG (Author) Other; Gendron, E (Author) Other; Genzel, R (Author) Other; Gillessen, S (Author) Other; Haubois, X (Author) Other; Haug, M (Author) Other; Haussmann, F (Author) Other; Hippler, S (Author) Other; Hubert, Z (Author) Other; Hummel, CA (Author) Other; Horrobin, M (Author) Other; Jocou, L (Author) Other; Kellner, S (Author) Other; Kervella, P (Author) Other; Kulas, M (Author) Other; Kolb, J (Author) Other; Lacour, S (Author) Other; Le Bouquin, JB (Author) Other; Lena, P (Author) Other; Lippa, M (Author) Other; Merand, A (Author) Other; Mueller, E (Author) Other; Ott, T (Author) Other; Panduro, J (Author) Other; Paumard, T (Author) Other; Perrin, G (Author) Other; Pfuhl, O (Author) Other; Ramirez, A (Author) Other; Rau, C (Author) Other; Rohloff, RR (Author) Other; Rousset, G (Author) Other; Scheithauer, S (Author) Other; Schoeller, M (Author) Other; Straubmeier, C (Author) Other; Sturm, E (Author) Other; Thi, WF (Author) Other; van Dishoeck, E (Author) Other; Vincent, F (Author) Other; Waisberg, I (Author) Other; Wank, I (Author) Other; Wieprecht, E (Author) Other; Wiest, M (Author) Other; Wiezorrek, E (Author) Other; Woillez, J (Author) Other; Yazici, S (Author) Other; Zins, G (Author) Other

Journal

Title: Astronomy and Astrophysics

Vol. 608

Final page: A78

ISSN: 0004-6361

Publisher: EDP Sciences

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 0 Citations

Other information

Authenticus ID: P-00N-C0E

DOI: 10.1051/0004-6361/201731058

Abstract (EN): 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 similar to 4000) observations of a classical T Tauri binary, S CrA (composed of S CrAN and S CrA S and separated by similar to 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 halfflux radii of about 0.1 au at d similar to 130 pc, inclinations (i = 28 +/- 3 degrees and i = 22 +/- 6 degrees), and position angles (PA = 0 degrees +/- 6 degrees and PA = -2 degrees +/- 12 degrees), suggesting that they formed from the fragmentation of a common disc. The S CrAN spectrum shows bright He i and Br gamma line emission exhibiting inverse PCygni profiles, typically associated with infalling gas. The continuum-compensated Br gamma line visibilities of S CrAN show the presence of a compact Br gamma emitting region whose radius is about similar to 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 gamma line components is marginally detected. Conclusions. The presence of an inverse PCygni profile in the He i and Br gamma lines, along with the tentative detection of a slightly larger size of the blue-shifted Br gamma line component, hint at the simultaneous presence of a wind and magnetospheric accretion in S CrA N.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12