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The Astronomical Journal Volume 120 Number 2 Create an alert RSS this journal

Adam J. Burgasser et al. 2000 The Astronomical Journal 120 1100 doi:10.1086/301475

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

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Adam J. Burgasser1, John C. Wilson2, J. Davy Kirkpatrick3, Michael F. Skrutskie4, Michael R. Colonno2, Alan T. Enos2, J. D. Smith2, Charles P. Henderson2, John E. Gizis3, Michael E. Brown5,6 and James R. Houck2

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Abstract References Cited By

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 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 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.


Keywords

stars: fundamental parameters; stars: individual (2MASSI J0559191-140448); stars: low-mass, brown dwarfs


Dates

Issue 2 (2000 August)

Received 2000 March 27, accepted for publication 2000 April 17



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