Computer Science – Databases
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.6902b&link_type=abstract
American Astronomical Society Meeting 210, #69.02; Bulletin of the American Astronomical Society, Vol. 39, p.176
Computer Science
Databases
Scientific paper
We present new L and T dwarf discoveries found photometrically in a cross-match of the Sloan Digital Sky Survey Data Release 1 (SDSS DR1) and the Two Micron All Sky Survey (2MASS). We use a large-scale cross-correlation approach, in which we simultaneously search the two databases under a combined set of find 2 new T dwarfs in addition to the 13 already known in the SDSS DR1 footprint. We also identify 22 new candidate and bona-fide L dwarfs, including a young L2 dwarf and a peculiar L2 dwarf with unusually blue near-IR colors--potentially the result of mildly sub-solar metallicity. We employ Monte Carlo tools to simulate the observed population of SDSS DR1 T dwarfs with 2MASS counterparts and find that the space density of T0-T8 dwarf systems is 0.007 per pc^3, i.e., about one per 140 pc^3. Finally, because our cross-match allows us to reliably probe for fainter, and potentially cooler objects in SDSS and 2MASS than is possible in either database alone, we discuss the prospects for finding T8 dwarfs in a future cross-correlation of the two databases based on the 4 times larger footprint (8000 deg^2) of SDSS Data Release 5.
Berriman Bruce G.
Kirkpatrick David
Looper Dagny
Metchev Stanimir
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