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 670.8Â nm and the strong H \alpha emission indicate a young age and a sub-stellar mass .
Our diffraction-limited images resolve a companion at the separation limit of HST/ACSÂ ( \sim 0 \aas@@fstack { \prime \prime } 06 ) .
The 2.1 mJy flux in the LW2 filter ( 5.0-8.5 \mu m ) of the Infrared Space Observatory ( ) likely corresponds to an infrared excess , suggesting the presence of circumstellar material .
Proper motion and photometric measurements , as well as the H \alpha activity , confirm membership in the R-CrA star forming region .
If confirmed by further observations , DENIS-PÂ J185950.9-370632 would be the first accreting sub-stellar multiple system observed to date .