9 papers
Spitzer Studies of Ultracool Subdwarfs: Metal-poor Late-type M, L and T Dwarfs
Adam J. Burgasser
Recent discoveries from red optical proper motion and wide-field near-infrared surveys have uncovered a new population of ultracool subdwarfs, metal-poor stars and brown dwarfs ext…
Spectral Classification Beyond M
S. K. Leggett, F. Allard, A. J. Burgasser +3
Significant populations of field L and T dwarfs are now known, and we anticipate the discovery of even cooler dwarfs by Spitzer and ground-based infrared surveys. However, as the n…
Ultracool Subdwarfs: Metal-poor Stars and Brown Dwarfs Extending into the Late-type M, L and T Dwarf Regimes
Adam J. Burgasser, J. Davy Kirkpatrick, Sebastien Lepine
Recent discoveries from red optical proper motion and wide-field near-infrared surveys have uncovered a new population of ultracool subdwarfs -- metal-poor stars and brown dwarfs e…
Clouds and Clearings in the Atmospheres of the L and T Dwarfs
M. S. Marley, A. Ackerman, A. J. Burgasser +3
A sophisticated approach to condensate opacity is required to properly model the atmospheres of L and T dwarfs. Here we review different models for the treatment of condensates in…
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…
The Classification of T Dwarfs
Adam J. Burgasser, J. Davy Kirkpatrick, Michael E. Brown
We discuss methods for classifying T dwarfs based on spectral morphological features and indices. T dwarfs are brown dwarfs which exhibit methane absorption bands at 1.6 and 2.2 $μ…