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Effective Temperatures of late L dwarfs and the onset of Methane signatures
Andreas Schweitzer, John E. Gizis, Peter H. Hauschildt +3
We present a spectral analysis of a sample of late L dwarfs. We use our latest model atmospheres and synthetic spectra and optical and K band spectra to determine effective tempera…
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…
Three Wide-Separation L dwarf Companions from the Two Micron All Sky Survey: Gl 337C, Gl 618.1B, and HD 89744B
J. C. Wilson, J. Davy Kirkpatrick, J. E. Gizis +3
We present two confirmed wide separation L-dwarf common proper motion companions to nearby stars and one candidate identified from the Two Micron All Sky Survey. Spectral types fro…
Three newly-discovered M-dwarf companions of Solar Neighbourhood stars
J. Davy Kirkpatrick, James Liebert, K. L. Cruz +2
We present low-resolution spectroscopy of newly-discovered candidate companions to three stars in the Solar Neighbourhood. All three companions are M dwarfs, with spectral types ra…