Spectroscopy of the Exoplanet HD 209458b

Details Spectroscopy of the Exoplanet HD 209458b Spectroscopy of the Exoplanet HD 209458b

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40466d&link_type=abstract

Spitzer Proposal ID #40466

Computer Science

Scientific paper

The spectra of two extrasolar planets (HD 209458b, and HD 189733b) have recently been measured using Spitzer/IRS at 7 -14 microns. Both planets show a lack of the water absorption that is expected to shape the IR spectra of these hot Jupiters. We propose follow-up observations of HD 209458b at 5 - 8 microns (SL2 mode) to measure the large gradient in planetary flux that we know (from IRAC) occurs over this wavelength range. Our observations will discriminate between models wherein water is depleted chemically, versus masked by cloud opacity, and will also provide information on the temperature gradient in the planet's atmosphere. We also propose to repeat our 7 -14 micron spectroscopy of HD 209458b, where we detected an emission peak in the planet's spectrum at 9.7 microns. We identified this peak as due to silicate clouds. Our repeat observations will use an improved technique, as recently developed by Grillmair et al. for HD 189733b, which will allow us to better determine the details of the silicate cloud composition.

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