Computer Science
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..311a&link_type=abstract
NOAO Proposal ID #2002A-0311
Computer Science
Scientific paper
Radial velocity studies of nearby stars have revealed that 5% of G and K stars have at least one planet with a mass of a few M_Jup orbiting within 3 AU of the primary, but less than 0.5% harbour a brown dwarf (BD). This apparent "brown dwarf desert" is now seriously questioned by the recent discovery of several "isolated" brown dwarfs orbiting nearby stars at relatively high angular separation with semi- major axis of ~100-3600 AU. A recent study suggests that the binary fraction of BDs could be as high as 10-15%. We propose to take advantage of the large field of view of ISPI-IR and MOSAIC2 on the 4m- Blanco telescope to search for brown dwarfs at high-angular separations around a volume-limited sample of nearby stars (3-10 pc). This study will be complemented by similar observations in the northern hemisphere requested on the CFHT 3.6m. Our survey based on IJH photometry shall be very sensitive, especially to the coolest T dwarfs. Finding BD in binary systems of known distances is very important as it would allow better determination of both their age and mass.
Albert Loic
Doyon Rene
Nadeau Daniel
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