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Title:
A young binary brown dwarf in the R-CrA star formation region
Authors:
Bouy, H.; Brandner, W.; Martín, E. L.; Delfosse, X.; Allard, F.; Baraffe, I.; Forveille, T.; Demarco, R.
Affiliation:
AA(Max-Planck Institut für extraterrestrische Physik, Giessenachstraße 1, 85748 Garching bei München, Germany ; European Southern Observatory, Karl Schwarzschildstraße 2, 85748 Garching bei München, Germany; Laboratoire d'Astrophysique de l'Observatoire de Grenoble, 414 rue de la piscine, 38400 Saint-Martin-d'Hères, France ), AB(Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany ), AC(Instituto de Astrofisica de Canarias, 38200 La Laguna, Spain ), AD(Laboratoire d'Astrophysique de l'Observatoire de Grenoble, 414 rue de la piscine, 38400 Saint-Martin-d'Hères, France ), AE(Centre de Recherche Astronomique de Lyon (UML 5574), École Normale Supérieure, 69364 Lyon Cedex 07, France ), AF(Centre de Recherche Astronomique de Lyon (UML 5574), École Normale Supérieure, 69364 Lyon Cedex 07, France ), AG(Laboratoire d'Astrophysique de l'Observatoire de Grenoble, 414 rue de la piscine, 38400 Saint-Martin-d'Hères, France ; Canada-France-Hawaii Telescope Corporation, PO Box 1597, Kamuela 96743, USA ), AH(European Southern Observatory, Karl Schwarzschildstraße 2, 85748 Garching bei München, Germany; Institut d'Astrophysique de Paris, 98bis, Bd Arago, 75014 Paris, France )
Publication:
Astronomy and Astrophysics, v.424, p.213-226 (2004) (A&A Homepage)
Publication Date:
09/2004
Origin:
A&A
A&A Keywords:
stars: individual: DENIS-P J185950.9-370632, stars: low mass, brown dwarfs, stars: binaries: visual, stars: circumstellar matter, techniques: high angular resolution
DOI:
10.1051/0004-6361:20035954
Bibliographic Code:
2004A&A...424..213B

Abstract

We present imaging and spectroscopic observations with HST (WFPC2, ACS/HRC and STIS), VLT (FORS2) and Keck (HIRES) of the dM 8 ultra-cool dwarf DENIS-P J185950.9-370632, located in the R-CrA region. The presence of lithium absorption at 670.8 nm and the strong Hα emission indicate a young age and a sub-stellar mass. Our diffraction-limited images resolve a companion at the separation limit of HST/ACS (˜0.06 arcsec). The 2.1 mJy flux in the LW2 filter (5.0-8.5 μm) of the Infrared Space Observatory \citep{1999A&A...350..883} likely corresponds to an infrared excess, suggesting the presence of circumstellar material. Proper motion and photometric measurements, as well as the Hα activity, confirm membership in the R-CrA star forming region. If confirmed by further observations, DENIS-P J185950.9-370632 would be the first accreting sub-stellar multiple system observed to date.
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