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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2004

A young binary brown dwarf in the R-CrA star formation region

Résumé

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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Dates et versions

hal-04111296 , version 1 (08-06-2023)

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H. Bouy, W. Brandner, E. L. Martín, X. Delfosse, F. Allard, et al.. A young binary brown dwarf in the R-CrA star formation region. Astronomy and Astrophysics - A&A, 2004, 424, pp.213-226. ⟨10.1051/0004-6361:20035954⟩. ⟨hal-04111296⟩
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