We present the first mid-infrared spectra of very low-mass stars and brown dwarfs obtained with the Infrared Spectrograph onboard the Spitzer Space Telescope. We observed GJ 1001 A (M3.5 V), DENIS 0255-4700 (L8), and ∊ Ind Ba/Bb (T1/T6). As expected from the predictions of model atmospheres, the spectra show absorption features of H2O, CH4 at 7.8 μm, and NH3 at 10.5 μm. This is the first detection of the 7.8 μm CH4 band in the spectrum of a brown dwarf and the first detection of NH3 in the atmosphere of a brown dwarf.
The Spitzer Space Telescope: New Views of the Cosmos
- Pub Date:
- December 2006