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A 2MASS L Dwarf Companion to the Nearby K Dwarf GJ 1048
John E. Gizis, J. Davy Kirkpatrick, John C. Wilson
We report the discovery of a probable L1 companion to the nearby K2 dwarf GJ 1048 using the Two Micron All-Sky Survey (2MASS). This source, 2MASSI J0235599-233120 or GJ 1048B, has…
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…
New Neighbors from 2MASS: Activity and Kinematics at the Bottom of the Main Sequence
John E. Gizis, David G. Monet, I. Neill Reid +3
We have combined 2MASS and POSS II data in a search for nearby ultracool (later than M6.5) dwarfs with K_s<12. Spectroscopic follow-up observations identify 53 M7 to M9.5 dwarfs an…
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…
J-Band Infrared Spectroscopy of a Sample of Brown Dwarfs Using Nirspec on Keck II
Ian S. McLean, Mavourneen K. Wilcox, E. E. Becklin +7
Near-infrared spectroscopic observations of a sample of very cool, low-mass objects are presented with higher spectral resolution than in any previous studies. Six of the objects a…
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…