Characterizing the Atmosphere and Evolution of the Transiting Extrasolar Planet HD 209458b

Details Characterizing the Atmosphere and Evolution of the Transiting Extrasolar Planet HD 209458b Characterizing the Atmosphere and Evolution of the Transiting Extrasolar Planet HD 209458b

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3405s&link_type=abstract

Spitzer Proposal ID #3405

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Scientific paper

The Spitzer Space Telescope is the first astronomical facility in human history which has the capability to measure the effective temperatures of planets orbiting other stars via continnuum infrared radiation. There are currently two extrasolar planets which are known to transit their parent stars. Although Spitzer cannot spatially resolve these systems, for the brightest system Spitzer can exploit the transit geometry to isolate the infrared radiation of the planet to determine the planet's temperature. This capability of Spitzer is well known to the extrasolar planet community. We propose a small, focused observational program to measure key parameters for characterizing the transiting planet HD209458b's atmosphere and for understanding the planet's evolution---key parameters only measurable with the Spitzer Space Telescope. The parameters we will measure are: an effective temperature; a very accurate, dynamically-significant eccentricity for the planet's orbit; and an improved planetary radius at 40 times longer wavelength than currently measured. In addition, we will attempt to measure the temperature difference between the day and night sides of this tidally-locked planet.

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