Physical Properties of T Dwarfs Inferred from High-Resolution Near-Infrared Spectra

Details Physical Properties of T Dwarfs Inferred from High-Resolution Near-Infrared Spectra Physical Properties of T Dwarfs Inferred from High-Resolution Near-Infrared Spectra

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542427r&link_type=abstract

American Astronomical Society, AAS Meeting #215, #424.27; Bulletin of the American Astronomical Society, Vol. 42, p.335

Astronomy and Astrophysics

Astronomy

Scientific paper

T dwarfs are ideal laboratories for understanding cool, complex atmospheres and calibrating low-mass evolutionary models in preparation for spectral studies of exoplanetary atmospheres. We present the expanded sample of T dwarfs from the NIRSPEC Brown Dwarf Spectroscopic Survey (BDSS). High-resolution near-infrared spectra from the cross-dispersed echelle spectrometer NIRSPEC on Keck II provide an unequaled combination of resolving power and wavelength coverage for detailed study of these intrinsically faint objects. The sample of 14 objects covers spectral types from T0 to T7.5, including two unresolved binaries and two peculiar objects. Physical properties of the T dwarfs are inferred from comparison of the observed spectra with synthetic spectra from PHOENIX "cond" model atmospheres, in which dust opacity is removed. We estimate effective temperature, surface gravity, radial and projected rotational velocity for the targets and compare to previously derived quantities. Furthermore we identify successes and deficiencies in the synthetic spectra, particularly in the reproduction of T0-T4 spectra.

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