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Moderate Resolution Spitzer Infrared Spectrograph (IRS) Observations of M, L, and T Dwarfs | | A. K. Mainzer
; Thomas L. Roellig
; D. Saumon
; Mark S. Marley
; Michael C. Cushing
; G. C. Sloan
; J. Davy Kirkpatrick
; S. K. Leggett
; John C. Wilson
; | | Date: |
13 Jan 2007 | | Abstract: | We present 10 - 19 um moderate resolution spectra of ten M dwarfs, one L dwarf, and two T dwarf systems obtained with the Infrared Spectrograph (IRS) onboard 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~600 spectra allow for a more detailed examination of clouds, non-equilibrium 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 epsilon Indi Ba, and we find that the NH3 feature in epsilon Indi Bb is best explained by a non-equilibrium 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. | | Source: | arXiv, astro-ph/0701398 | | Services: | Forum | Review | PDF | Favorites | |
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