A Precise Estimate of the Radius of HD 149026b
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چکیده
We present Spitzer 8 μm 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 planetstar 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 i =85. 4 +0. ◦ 9 −0. 8 and a planet radius of 0.755 ± 0.040 RJ. These measurements further support models in which the planet is greatly enriched in heavy elements.
منابع مشابه
A Precise Estimate of the Radius of the Exoplanet HD 149026b from Spitzer Photometry
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 ste...
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تاریخ انتشار 2008