A Precise Estimate of the Radius of the Exoplanet HD 149026b from Spitzer Photometry

Details A Precise Estimate of the Radius of the Exoplanet HD 149026b from Spitzer Photometry A Precise Estimate of the Radius of the Exoplanet HD 149026b from Spitzer Photometry

2008-05-06

arxiv.org/abs/0805.0777v2

Astrophys.J.692:229-235,2009

Astronomy and Astrophysics

Astrophysics

18 pages, 4 figures, accepted to ApJ

Scientific paper

10.1088/0004-637X/692/1/229

We present Spitzer 8 micron transit observations of the extrasolar planet HD 149026b. At this wavelength, transit light curves are weakly affected by stellar limb-darkening, allowing for a simpler and more accurate determination of planetary parameters. We measure a planet-star radius ratio of Rp/Rs = 0.05158 +/- 0.00077, and in combination with ground-based data and independent constraints on the stellar mass and radius, we derive an orbital inclination of i = 85.4 +0.9/-0.8 degrees and a planet radius of Rp = 0.755 +/- 0.040 R_jup. These measurements further support models in which the planet is greatly enriched in heavy elements.

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