A Precise Estimate of the Radius of HD 149026b

Details A Precise Estimate of the Radius of HD 149026b A Precise Estimate of the Radius of HD 149026b

2008-07-08

arxiv.org/abs/0807.1318v1

Astronomy and Astrophysics

Astrophysics

To appear in the Proceedings of the 253rd IAU Symposium: "Transiting Planets", May 2008, Cambridge, MA

Scientific paper

10.1017/S1743921308026951

We present Spitzer 8 micron transit observations of the extrasolar planet system HD 149026. 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 R_p/R_s = 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 deg. and a planet radius of 0.755 +/- 0.040 Jupiter radii. These measurements further support models in which the planet is greatly enriched in heavy elements.

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