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S Ori 70: Just a Foreground Field Brown Dwarf?
Adam J. Burgasser, J. Davy Kirkpatrick, Mark R. McGovern +3
We examine recent claims that the T-type brown dwarf S Ori 053810.1-023626 (S Ori 70) is a spectroscopically verified low mass (3 M) member of the 1--8 Myr …
Identifying Young Brown Dwarfs Using Gravity-Sensitive Spectral Features
Mark R. McGovern, J. Davy Kirkpatrick, Ian S. McLean +3
We report the initial results of the Brown Dwarf Spectroscopic Survey Gravity Project, to study gravity sensitive features as indicators of youth in brown dwarfs. Low-resolution (R…
The NIRSPEC Brown Dwarf Spectroscopic Survey. I. Low-Resolution Near-Infrared Spectra
Ian S. McLean, Mark R. McGovern, Adam J. Burgasser +3
We present the first results of a near-infrared (0.96-2.31 micron) spectroscopic survey of M, L, and T dwarfs obtained with NIRSPEC on the Keck II telescope. Our new survey has a r…
The 2MASS Wide-Field T Dwarf Search. II. Discovery of Three T Dwarfs in the Southern Hemisphere
Adam J. Burgasser, Michael W. McElwain, J. Davy Kirkpatrick
We present the discovery of three new Southern Hemisphere T dwarfs identified in the Two Micron All Sky Survey. These objects, 2MASS 0348-6022, 2MASS 0516-0445, and 2MASS 2228-4310…
The Spectra of T Dwarfs. II. Red Optical Data
Adam J. Burgasser, J. Davy Kirkpatrick, James Liebert +1
We present 6300--10100 Å spectra for a sample of 13 T dwarfs observed using LRIS mounted on the Keck I 10m Telescope. A variety of features are identified and analyzed, including p…
Photometric Variability at the L/T Dwarf Boundary
Melissa L. Enoch, Michael E. Brown, Adam J. Burgasser
We have monitored the photometric variability of nine field L and T brown dwarfs for 10 nights during the course of one month with the Palomar 60 inch Telescope Near-Infrared Camer…