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The Spectra and Classification of L and T Dwarfs
Adam J. Burgasser
In this contribution, I discuss some of the salient features of L and T dwarf spectra in both the red optical (6300--10000 Å) and near-infrared (1--2.5 $\micron$) wavelength regime…
Near-Infrared Spectroscopy of Brown Dwarfs: Methane and the Transition between the L and T Spectral Types
Ian S. McLean, L. Prato, Sungsoo S. Kim +3
We report the possible identification of weak methane spectral features in the near-infrared K band in two late L dwarfs, DENIS 0205-11 (L7) and 2MASS 1523+30 (L8). New, high signa…
Theoretical Spectral Models of T Dwarfs at Short Wavelengths and Their Comparison with Data
Adam Burrows, Adam J. Burgasser, J. Davy Kirkpatrick +4
We have generated new, self-consistent spectral and atmosphere models for the effective temperature range 600 K to 1300 K thought to encompass the known T dwarfs. For the first tim…
The Spectra of T Dwarfs I: Near-Infrared Data and Spectral Classification
Adam J. Burgasser, J. Davy Kirkpatrick, Michael E. Brown +9
We present near-infrared spectra for a sample of T dwarfs, including eleven new discoveries made using the Two Micron All Sky Survey. These objects are distinguished from warmer (L…
Substellar Companions to Main Sequence Stars: No Brown Dwarf Desert at Wide Separations
John E. Gizis, J. Davy Kirkpatrick, Adam Burgasser +4
We use three field L and T dwarfs which were discovered to be wide companions to known stars by the Two Micron All-Sky Survey (2MASS) to derive a preliminary brown dwarf companion…
Brown Dwarf Companions to G-type Stars. I: Gliese 417B and Gliese 584C
J. Davy Kirkpatrick, Conard C. Dahn, David G. Monet +4
We present astrometric and spectroscopic observations confirming that two nearby G dwarf systems (Gliese 417 = BD+36 2162 and Gliese 584AB = eta CrB AB) have a widely separated, L…