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Ultracool Subdwarfs: Metal-poor Stars and Brown Dwarfs Extending into the Late-type M, L and T Dwarf Regimes
Adam J. Burgasser, J. Davy Kirkpatrick, Sebastien Lepine
Recent discoveries from red optical proper motion and wide-field near-infrared surveys have uncovered a new population of ultracool subdwarfs -- metal-poor stars and brown dwarfs e…
2MASS Data Mining and the M, L, and T Dwarf Archives
J. Davy Kirkpatrick
Studies of brown dwarfs as a distinct galactic population have been largely pioneered by dedicated, vast-area surveys at deep optical and near-infrared wavebands. The Two Micron Al…
The Next Generation Sky Survey and the Quest for Cooler Brown Dwarfs
J. Davy Kirkpatrick
The Next Generation Sky Survey (NGSS) is a proposed NASA MIDEX mission to map the entire sky in four infrared bandpasses - 3.5, 4.7, 12, and 23 um. The seven-month mission will use…
The Classification of T Dwarfs
Adam J. Burgasser, J. Davy Kirkpatrick, Michael E. Brown
We discuss methods for classifying T dwarfs based on spectral morphological features and indices. T dwarfs are brown dwarfs which exhibit methane absorption bands at 1.6 and 2.2 $μ…
A Keck/HST Survey for Companions to Low-Luminosity Dwarfs
D. W. Koerner, J. Davy Kirkpatrick, I. N. Reid +1
We present preliminary results of an imaging survey for companions to low-luminosity dwarfs with spectral types ranging from M7 to L9. A K-band study with the Near Infrared Camera…
Two nearby M dwarf binaries from 2MASS
J. E. Gizis, D. G. Monet, I. N. Reid +2
We report the discovery of two binary M dwarf systems in the immediate solar neighborhood using 2MASS. The first is an M6.5 companion to the nearby G star HD 86728 (Gl 376). The kn…