Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21010204r&link_type=abstract
American Astronomical Society Meeting 210, #102.04; Bulletin of the American Astronomical Society, Vol. 39, p.229
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Recently two independent groups announced measurements of the infrared spectra of extrasolar planets using the Spitzer Space Telescope. Our group detected the 7.5 to 13.2 micron spectrum of HD 209485 b (Richardson et al., 2007), followed closely by a publication on HD 189733 b (Grillmair et al., 2007). Both groups used similar observational strategies, employing the Infrared Spectrograph (IRS) on board Spitzer to observe the secondary eclipse of the planet, i.e., the time when the planet disappears behind the star. By subtracting spectra obtained during eclipse (star only) from spectra obtained outside eclipse (star + planet) the emission spectrum of the planet is derived. For HD 209458 b, we find no evidence for the expected water absorption between 8 and 9.5 microns, and we find a weak emission feature near 9.65 microns. This emission feature corresponds to the fundamental vibrational mode of Si-O, which is suggestive of silicate grains. We discuss implications for the structure of the planet's atmosphere.
Deming Drake
Harrington Joseph
Horning Karen
Richardson Lee Jeremy
Seager Sara
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