Abstract
We present the first results of a spectroscopic survey of M, L, and T dwarfs being conducted with the Infrared Spectrograph onboard the Spitzer Space Telescope. We observed GJ 1001 A (M3.5 V), DENIS 0255-4700 (L8.0 V), and ε Ind Ba/Bb (T1/T6 V). As expected from the predictions of model atmospheres, the spectra show absorption features of H 2O, CH 4 at 7.8 μm, and NH 3 at 10.5 μm. This is the first detection of the 7.8 μm CH 4 band and the first secure detection of NH 3 in the spectra of brown dwarfs. Finally, we compute the bolometric luminosities of three of the dwarfs in our sample by combining 0.6-4.1 μm spectra with the Spitzer spectra and find good agreement with previous results that use L′-and M′-band photometry to account for the flux emitted between 2.5 and 5 μm.
Original language | English (US) |
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Pages (from-to) | 245-248 |
Number of pages | 4 |
Journal | European Space Agency, (Special Publication) ESA SP |
Issue number | 560 I |
State | Published - 2005 |
Externally published | Yes |
Event | 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - Hamburg, Germany Duration: Jul 5 2004 → Jul 9 2004 |
Keywords
- Infrared: stars
- Stars: late-type
- Stars: low-mass, brown dwarfs
ASJC Scopus subject areas
- Aerospace Engineering
- Space and Planetary Science