Volume 644, December 2020
|Number of page(s)||10|
|Section||Interstellar and circumstellar matter|
|Published online||09 December 2020|
A triple star in disarray
Multi-epoch observations of T Tauri with VLT-SPHERE and LBT-LUCI
European Southern Observatory,
2 Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
3 INAF–Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy
4 Max-Planck-Institute for Astronomy (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
5 CRAL, CNRS, Université Lyon 1, Université de Lyon, ENS, 9 avenue Charles Andre, 69561 Saint Genis Laval, France
6 Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
7 Anton Pannekoek Institute for Astronomy, Science Park 9, 1098XH Amsterdam, The Netherlands
8 DOTA, ONERA, Université Paris Saclay, 91123, Palaiseau France
9 Aix-Marseille Université, CNRS, CNES, LAM, Marseille, France
10 Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile
11 Escuela de Ingeniería Industrial, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile
12 LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, France
13 European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago, Chile
14 Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290 Versoix, Switzerland
15 Department of Astrophysics, University of Vienna, Türkenschanzstr. 17 (Sternwarte), 1180 Vienna, Austria
16 Landessternwarte, Zentrum für Astronomie der Universität Heidelberg, Königstuhl 12, 69117 Heidelberg, Germany
17 INAF - Catania Astrophysical Observatory, via S. Sofia 78, 95123 Catania, Italy
Accepted: 20 October 2020
Aims. T Tauri remains an enigmatic triple star for which neither the evolutionary state of the stars themselves, nor the geometry of the complex outflow system is completely understood. Eight-meter class telescopes equipped with state-of-the-art adaptive optics provide the spatial resolution necessary to trace tangential motion of features over a timescale of a few years, and they help to associate them with the different outflows.
Methods. We used J-, H-, and K-band high-contrast coronagraphic imaging with VLT-SPHERE recorded between 2016 and 2018 to map reflection nebulosities and obtain high precision near-infrared (NIR) photometry of the triple star. We also present H2 emission maps of the ν = 1-0 S(1) line at 2.122 μm obtained with LBT-LUCI during its commissioning period at the end of 2016.
Results. The data reveal a number of new features in the system, some of which are seen in reflected light and some are seen in H2 emission; furthermore, they can all be associated with the main outflows. The tangential motion of the features provides compelling evidence that T Tauri Sb drives the southeast–northwest outflow. T Tauri Sb has recently faded probably because of increased extinction as it passes through the southern circumbinary disk. While Sb is approaching periastron, T Tauri Sa instead has brightened and is detected in all our J-band imagery for the first time.
Key words: stars: variables: T Tauri, Herbig Ae/Be / techniques: high angular resolution / stars: formation / stars: winds, outflows
© ESO 2020
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