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Discovery of a Bright Field Methane (T-Type) Brown Dwarf by 2MASS

By Adam J. Burgasser, John C. Wilson, J. Davy Kirkpatrick, Michael F. Skrutskie, Michael R. Colonno, Alan T. Enos, J. D. Smith, Charles P. Henderson, John E. Gizis, Michael E. Brown and James R. Houck


We report the discovery of a bright (J = 13.83 ± 0.03) methane brown dwarf, or T dwarf, by the Two Micron All Sky Survey. This object, 2MASSI J0559191-140448, is the first brown dwarf identified by the newly commissioned CorMASS instrument mounted on the Palomar 60 inch (1.5 m) telescope. Near-infrared spectra from 0.9 to 2.35 μm show characteristic CH_4 bands at 1.1, 1.3, 1.6, and 2.2 μm, which are significantly shallower than those seen in other T dwarfs discovered to date. Coupled with the detection of an FeH band at 0.9896 μm and two sets of K I doublets at J band, we propose that 2MASS J0559-14 is a warm T dwarf, close to the transition between L and T spectral classes. The brightness of this object makes it a good candidate for detailed investigation over a broad wavelength regime and at higher resolution

Publisher: American Astronomical Society
Year: 2000
OAI identifier:
Provided by: Caltech Authors

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