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A young binary brown dwarf in the R-CrA star formation region
We present imaging and spectroscopic observations with HST (WFPC2,ACS/HRC and STIS), VLT (FORS2) and Keck (HIRES) of the dM 8 ultra-cooldwarf DENIS-P J185950.9-370632, located in the R-CrAregion. The presence of lithium absorption at 670.8 nm and the strongHα emission indicate a young age and a sub-stellar mass. Ourdiffraction-limited images resolve a companion at the separation limitof 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 andphotometric measurements, as well as the Hα activity, confirmmembership in the R-CrA star forming region. If confirmed by furtherobservations, DENIS-P J185950.9-370632 would be the first accretingsub-stellar multiple system observed to date.
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