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Near-Infrared Spectral Classification of late-M and L Dwarfs
I. Neill Reid, A. J. Burgasser, K. L. Cruz +2
We present near-infrared (1 to 2.5 micron) low-resolution spectroscopy of eleven ultracool dwarfs with spectral types ranging from M7 to L8. Combining our observations with data pu…
Discovery of a Bright Field Methane (T-type) Brown Dwarf by 2MASS
Adam J. Burgasser, John C. Wilson, J. Davy Kirkpatrick +8
We report the discovery of a bright (J = 13.830.03) methane brown dwarf, or T dwarf, by the Two Micron All Sky Survey. This object, 2MASSI J0559191-140448, is the first brown…
An Improved Red Spectrum of the Methane or T-dwarf SDSS 1624+0029: Role of the Alkali Metals
James Liebert, I. Neill Reid, Adam Burrows +3
A Keck~II low resolution spectrum shortward of ome-micron is presented for SDSS 1624+0029, the first field methane or T dwarf discovered in the Sloan Digital Sky Survey. Significan…
Sixty-seven Additional L Dwarfs Discovered by the Two Micron All Sky Survey (2MASS)
J. Davy Kirkpatrick, I. Neill Reid, James Liebert +6
We present JHKs photometry, far red spectra, and spectral classifications for an additional 67 L dwarfs discovered by the Two Micron All Sky Survey. One of the goals of this new se…
Detection of H Alpha Emission in a Methane (T-Type) Brown Dwarf
Adam J. Burgasser, J. Davy Kirkpatrick, I. Neill Reid +3
We report the detection of H{} emission in the T dwarf (methane brown dwarf) 2MASSW J1237392+652615 over three days using the Keck Low Resolution Imaging Spectrograph. The measu…
Discovery of a Brown Dwarf Companion to Gliese 570ABC: A 2MASS T Dwarf Significantly Cooler than Gliese 229B
A. J. Burgasser, J. D. Kirkpatrick, R. M. Cutri +10
We report the discovery of a widely separated (258$\farcs3\pm0\farcs$4) T dwarf companion to the Gl 570ABC system. This new component, Gl 570D, was initially identified from the Tw…