Physics
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop..260d&link_type=abstract
Spitzer Proposal ID #260
Physics
Scientific paper
The recently announced transiting extrasolar planet orbiting HD 189733 is a very hot Jupiter with an orbital period of only 2.2 days. It is not only the brightest representative of this dynamical class of extrasolar planets, it is the brightest of all known transiting extrasolar planets in the infrared. By comparing HD 189733b to members of the hot Jupiter class with somewhat longer orbital periods, Spitzer observations can provide true comparative exoplanetology. This will ultimately allow new insights and raise new questions - into the effect of initial mass on the planet's spectrum, on how it evolves in the presence of stellar irradiation, and on the physical origin of different dynamical classes of close-in giant planets. We propose to measure the planet's brightness temperature at 16 microns, by detecting the secondary eclipse to very high S/N, using IRS peak-up imaging photometry. Our observations will measure the planet's brightness temperature to a precision of ±13K, an order of magnitude more precise than our MIPS measurement of HD 209458b. Achieving this precision will enable the best possible suite of detailed follow-up studies (e.g., spectroscopy) to be planned for GO-3.
Deming Drake
Harrington Joseph
Richardson Lee Jeremy
Seager Sara
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