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Moderate-resolution Spitzer infrared spectrograph observations of M, L, and T dwarfs

Show simple item record Mainzer, A. K. Roellig, Thomas L. Saumon, D. Marley, Mark S. Cushing, Michael C. Sloan, G. C. Kirkpatrick, J. Davy Leggett, S. K. Wilson, John C. 2008-08-21T22:45:01Z 2008-08-21T22:45:01Z 2007-06-20
dc.identifier.citation The Astrophysical Journal, 662:1245-1253, 2007 June 20 en_US
dc.identifier.clearanceno 06-3421
dc.description.abstract We present 10-19 μm moderate-resolution spectra of 10 M dwarfs, one L dwarf, and two T dwarf systems obtained with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope. The IRS allows us to examine molecular spectroscopic features/lines at moderate spectral resolution in a heretofore untapped wavelength regime. These R = λ/Δλ ~ 600 spectra allow for a more detailed examination of clouds and nonequilibrium chemistry, as well as the molecular features of H2O, NH3, and other trace molecular species that are the hallmarks of these objects. A cloud-free model best fits our mid-infrared spectrum of the T1 dwarf Є Indi Ba, and we find that the NH3 feature in Є Indi Bb is best explained by a nonequilibrium abundance due to vertical transport in its atmosphere.We examined a set of objects (mostly M dwarfs) in multiple systems to look for evidence of emission features, which might indicate an atmospheric temperature inversion, as well as trace molecular species; however, we found no evidence of either. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher The American Astronomical Society en_US
dc.subject stars en_US
dc.subject late-type en_US
dc.subject low mass brown dwarfs en_US
dc.title Moderate-resolution Spitzer infrared spectrograph observations of M, L, and T dwarfs en_US
dc.type Article en_US

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