A young binary Brown Dwarf in the R-CrA star formation region

Details A young binary Brown Dwarf in the R-CrA star formation region A young binary Brown Dwarf in the R-CrA star formation region

2004-04-29

arxiv.org/abs/astro-ph/0404576v1

Astron.Astrophys.424:213-226,2004

Astronomy and Astrophysics

Astrophysics

18 pages, 11 figures, 3 tables Version with full resolution figures available on: ftp://ftp.mpe.mpg.de/people/hbouy/publicatio

Scientific paper

10.1051/0004-6361:20035954

We present imaging and spectroscopic observations with HST (WFPC2, ACS/HRC and STIS), VLT (FORS2) and Keck (HIRES) of the dM8 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 Halpha 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"). The 2.1 mJy flux in the LW2 filter (5.0-8.5 microns) of the Infrared Space Observatory (see 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 Halpha 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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