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The Discovery of a Companion to the Very Cool Dwarf Gl~569~B with the Keck Adaptive Optics Facility
E. L. Martín, C. D. Koresko, S. R. Kulkarni +2
We report observations obtained with the Keck adaptive optics facility of the nearby (d=9.8 pc) binary Gl~569. The system was known to be composed of a cool primary (dM2) and a ver…
An L-type substellar object in Orion: reaching the mass boundary between brown dwarfs and giant planets
M. R. Zapatero Osorio, V. J. S. Bejar, R. Rebolo +2
We present J-band photometry and low-resolution optical spectroscopy (600-1000 nm) for one of the faintest substellar member candidates in the young sigma Ori cluster, SOri 47 (I=2…
PPl 15: The First Brown Dwarf Spectroscopic Binary
Gibor Basri, Eduardo Martin
PPl 15 is the first object to have been confirmed as a brown dwarf by the lithium test (in 1995), though its inferred mass was very close to the substellar limit. It is a member of…
Radio emission from RASS sources south of Taurus-Auriga
A. Magazzu, G. Umana, E. L. Martin
We present a 8.4 GHz VLA survey of 50 optical counterparts to 46 ROSAT All-Sky survey (RASS) X-ray sources south of the Taurus-Auriga star-forming region. This survey detected 3 so…