instrumentation: spectrographs; methods: data analysis; techniques: imaging spectroscopy; stars: pre-main sequence; stars: individual: R CrA; Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] <BR /> Aims: R Coronae Australis (R CrA) is the brightest star of the Coronet nebula of the Corona Australis (CrA) star forming region. This star is very red in color, probably due to dust absorption, and is strongly variable. High-contrast instruments allow for an unprecedented direct exploration of the immediate circumstellar environment of this star. <BR /> Methods: We observed R CrA with the near-infrared (NIR) channels (IFS and IRDIS) of SPHERE at the Very Large Telescope (VLT). In this paper, we used four different epochs, three of which are from open time observations while one is from SPHERE guaranteed time. The data were reduced using the data reduction and handling pipeline and the SPHERE Data Center. We implemented custom IDL routines on the reduced data with the aim to subtract the speckle halo. We have also obtained pupil-tracking H-band (1.45-1.85 μm) observations with the VLT/SINFONI NIR medium-resolution (R ̃ 3000) spectrograph. <BR /> Results: A companion was found at a separation of 0.156″ from the star in the first epoch and increasing to 0.184″ in the final epoch. Furthermore, several extended structures were found around the star, the most noteworthy of which is a very bright jet-like structure northeast from the star. The astrometric measurements of the companion in the four epochs confirm that it is gravitationally bound to the star. The SPHERE photometry and SINFONI spectrum, once corrected for extinction, point toward a spectral type object that is early M with a mass between 0.3 and 0.55 M[SUB]☉[/SUB]. The astrometric analyis provides constraints on the orbit paramenters: e ̃ 0.4, semimajor axis at 27-28 au, inclination of ̃70°, and a period larger than 30 yr. We were also able to put constraints of few M[SUB]Jup[/SUB] on the mass of possible other companions down to separations of few tens of au. <P />Based on observations made with European Southern Observatory (ESO) telescopes at Paranal Observatory in Chile, under programs ID 095.C-0787(A), 097.C-0591(A), 1100.C-0481(H), 0101.C-0350(A) and 2101.C-5048(A).The SPHERE and SINFONI images are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/624/A4">http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/624/A4</A>
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Mesa, D.; INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy ; INCT, Universidad De Atacama, Calle Copayapu 485, Copiapó, Atacama, Chile
Bonnefoy, M.; Univ. Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Zurlo, A.; Nucleo de Astronomia, Facultad de Ingenieria y Ciencias, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile ; Escuela de Ingenieria Industrial, Facultad de Ingenieria y Ciencias, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile ; Aix Marseille Univ., CNRS, CNES, LAM, Marseille, France
Antoniucci, S.; INAF-Osservatorio Astronomico di Roma, Via di Frascati 33, 00078, Monte Porzio Catone, Italy
Barbieri, M.; INCT, Universidad De Atacama, Calle Copayapu 485, Copiapó, Atacama, Chile
Benisty, M.; Unidad Mixta Internacional Franco-Chilena de Astronoma (CNRS, UMI 3386), Departamento de Astronoma, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, Chile ; Univ. Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Boccaletti, A.; LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne, Paris Cité, 5 Place Jules Janssen, 92195, Meudon, France
Manara, C. F.; European Southern Observatory (ESO), Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany
Meyer, M.; Department of Astronomy, University of Michigan, 1085 S. University Ave, Ann Arbor, MI, 48109-1107, USA
Reggiani, M.; Space Sciences, Technologies & Astrophysics Research (STAR) Institute, Université de Liege, Allée du Six Aout 19c, 4000, Sart Tilman, Belgium
Samland, M.; Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
Van den Ancker, M.; European Southern Observatory (ESO), Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany
Chauvin, G.; Univ. Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France
Cheetham, A.; Geneva Observatory, University of Geneva, Chemin des Maillettes 51, 1290, Versoix, Switzerland
Feldt, M.; Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
Hugot, E.; Aix Marseille Univ., CNRS, CNES, LAM, Marseille, France
Janson, M.; Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany ; AlbaNova University Center, Stockholm University, Stockholm, Sweden
Ligi, R.; INAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807, Merate, Italy
Möller-Nilsson, O.; Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany
Petit, C.; DOTA, ONERA, Université Paris Saclay, F-91123, Palaiseau France
Rickman, E. L.; Geneva Observatory, University of Geneva, Chemin des Maillettes 51, 1290, Versoix, Switzerland
Rigal, F.; Anton Pannekoek Institute for Astronomy, Science Park 904, 1098 XH, Amsterdam, The Netherlands
Wildi, F.; Geneva Observatory, University of Geneva, Chemin des Maillettes 51, 1290, Versoix, Switzerland)
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