Bibcode
Bouy, H.; Brandner, W.; Martín, E. L.; Delfosse, X.; Allard, F.; Baraffe, I.; Forveille, T.; Demarco, R.
Referencia bibliográfica
Astronomy and Astrophysics, v.424, p.213-226 (2004)
Advertised on:
9
2004
Revista
Número de citas
30
Número de citas referidas
26
Descripción
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.