Spitzer IRS Spectra of Ultracool Dwarfs

Details Spitzer IRS Spectra of Ultracool Dwarfs Spitzer IRS Spectra of Ultracool Dwarfs

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20711003c&link_type=abstract

American Astronomical Society Meeting 207, #110.03; Bulletin of the American Astronomical Society, Vol. 37, p.1338

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first mid-infrared spectra of a sample of low-mass stars and brown dwarfs. These data were obtained with the Infrared Spectrograph onboard the Spitzer Space Telescope as part of the 'Dim Suns' Guaranteed Time Observing program. As expected from the predictions of model atmospheres, the spectra exhibit absorption bands of H2O at 6.5 microns, CH4 at 7.8 microns, and NH3 at 10.5 microns. Indeed these observations provide the first secure detection of NH3 in the atmospheres of brown dwarfs. We also compare the spectra to the latest atmospheric models that include the formation of condensate clouds and find good agreement between the models and the data. Finally we discuss a number of interesting objects that show peculiar spectral features.
M.C.C. acknowledges financial support through the Spitzer Space Telescope Fellowship Program.

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