Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..271b&link_type=abstract
NOAO Proposal ID #1999B-0271
Physics
Scientific paper
Using 2MASS data, we are systematically searching for the coolest sub-stellar objects in the Solar Neighborhood, L dwarfs and methane brown dwarfs. Follow-up investigations of red 2MASS point sources in the northern hemisphere by Kirkpatrick et al. 1999 led to the identification of the L spectral class, a critical population whose effective temperatures (2000 - 1400^oK) straddle the stellar- substellar boundary. None of these objects are as cool as the methane brown dwarf Gl 229B, however, whose photometric properties are quite different from even the latest L dwarfs. We are continuing to search for L dwarfs and methane brown dwarfs using 2MASS data, which to date has yielded 74 L dwarfs and at least two convincing T dwarf candidates in 2700 square degrees of search area in the northern hemisphere. We propose to continue a southern hemisphere investigation of both classes of objects using CTIO. We will use the 1.5m CIRIM to image our candidates sources (in order to exclude contaminant asteroids), and the 4m IRS in cross-dispersed mode to acquire spectral classification.
Brown Mike E.
Burgasser Adam Jonathan
Kirkpatrick Joseph D.
Reid Iain Neill
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