Journal or Book Title
The Astronomical Journal
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 Telescope. Near-infrared spectra from 0.9 - 2.35 μm show characteristic CH4 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 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
Burgasser, Adam J.; Wilson, John C.; Kirkpatrick, J. Davy; Skrutskie, Michael F.; Colonno, Michael R.; Enos, Alan T.; Smith, J. D.; Henderson, Charles P.; Gizis, John E.; Brown, Michael E.; and Houck, James R., "Discovery of a Bright Field Methane (T-type) Brown Dwarf by 2MASS" (2000). The Astronomical Journal. 100.