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Catalogue POP – Notice individuelle de publication

Gravity Collaboration .., Garcia López R., Perraut Karine, Caratti o Garatti A., Lazareff Bernard, Sanchez-Bermudez J., Benisty Myriam, Dougados Catherine, Labadie Lucas, Brandner W., García Paulo, Henning Thomas, Ray T., Abuter Roberto, Amorim A., Anugu Narsireddy, Berger Jean-Philippe, Bonnet H., Buron A., Caselli Paola, Clénet Yann, Coudé du Foresto Vincent, De Wit Willem-Jan, Deen Casey P., Delplancke-Ströbele F., Dexter J., Eckart Andreas, Eisenhauer Frank, Garcia-Dabo C. E., Gendron Éric, Genzel Reinhard, Gillessen S., Haubois Xavier, Haug Marcus, Haussmann Frank, Hippler Stefan, Hubert Zoltan, Hummel Christian A., Horrobin Matthew, Jocou L., Kellner Stefan, Kervella Pierre, Kulas Martin, Kolb Johann, Lacour Sylvestre, Le Bouquin Jean-Baptiste, Léna Pierre, Lippa Magdalena, Merand Antoine, Müller Eric, Ott Thomas, Panduro Johana, Paumard Thibaut, Perrin Guy, Pfuhl Oliver, Ramírez A., Rau C., Rohloff Ralf-Rainer, Rousset Gérard, Scheithauer Silvia, Schoeller Markus, Straubmeier Christian, Sturm Eckhard, Thi W.-F., Van Dishoeck Ewine F., Vincent Frédéric, Waisberg I., Wank I., Wieprecht Ekkehard, Wiest M., Wiezorrek E., Woillez Julien M., Yazici Senol, Zins Gerard

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

Astronomy and Astrophysics, 2017, vol. 608

Référence DOI : 10.1051/0004-6361/201731058
Référence ADS : 2017A&A...608A..78G

Résumé :

<BR /> Aims: To investigate the inner regions of protoplanetary discs, we performed near-infrared interferometric observations of the classical T Tauri binary system S CrA. <BR /> 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. <BR /> 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 Brgamma line emission exhibiting inverse P Cygni profiles, typically associated with infalling gas. The continuum-compensated Brgamma line visibilities of S CrA N show the presence of a compact Brgamma 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 Brgamma line components is marginally detected. <BR /> Conclusions: The presence of an inverse P Cygni profile in the He I and Brgamma lines, along with the tentative detection of a slightly larger size of the blue-shifted Brgamma line component, hint at the simultaneous presence of a wind and magnetospheric accretion in S CrA N.

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