Atmospheric Constraints of Two Exoplanets Using The Spitzer Space Telescope

Details Atmospheric Constraints of Two Exoplanets Using The Spitzer Space Telescope Atmospheric Constraints of Two Exoplanets Using The Spitzer Space Telescope

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741801s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #418.01; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The Spitzer Exoplanet Target of Opportunity program observes secondary eclipses, when the planet passes behind its parent star, to provide direct measurements of emitted planetary flux, thus constraining atmospheric models. Here we present dayside atmospheric constraints of two exoplanets using a total of 16 secondary eclipse observations at six different infrared wavelengths. The first exoplanet is HD 149026b which transits its large, relatively hot G0 parent star at a distance of only 0.042 AU. The Saturn-sized planet's high average density suggests that most of its mass must be in its large, 80 Earth-mass icy/rocky core. The second planet, GJ 436b, is a hot Neptune that orbits a small, M-dwarf star and is currently Earth's nearest transiting exoplanet at a distance of only 33 ly. We also present a new technique that models Spitzer's position-dependent sensitivity effect using a high resolution, bilinearly-interpolated subpixel sensitivity map. Spitzer is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA, which provided support for this work.

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