A PRECISE ESTIMATE OF THE RADIUS OF THE EXOPLANET HD 149026b FROMSPITZERPHOTOMETRY
- 10 February 2009
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 692 (1) , 229-235
- https://doi.org/10.1088/0004-637x/692/1/229
Abstract
We present Spitzer 8 μm 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 /R = 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 and a planet radius of Rp = 0.755 ± 0.040 RJ . These measurements further support models in which the planet is greatly enriched in heavy elements.Keywords
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