HD 149026 b半径的精确估计
A Precise Estimate of the Radius of HD 149026b
摘要：
我们目前斯皮策8微米凌日观测的系外行星系统HD 149026。在这个波长下，凌日光变曲线受恒星边缘变暗的影响很小，因此可以更简单、更准确地测定行星的参数。我们测量了一颗行星与恒星的半径比R_p/R_s = 0.05158 +/-0.00077，结合地面数据和恒星质量和半径的独立约束，我们得到了一个轨道倾角i = 85.4 + 0.9/-0.8度。行星半径为0.755 +/- 0.040木星半径。这些测量结果进一步支持了该行星富含重元素的模型。
英文摘要：
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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