交通灯曲线项目。IX。系外行星XO-3b半径较小的证据
The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b
摘要：
我们提出了13个凌日的XO-3b，一个巨大的凌日行星的偏心轨道测光。先前的数据导致了两个不一致的行星半径估计。我们的数据强烈支持更小的半径，具有更高的精度：R_p = 1.217 +/- 0.073 R_Jup。由光变曲线确定的平均恒星密度与由谱线形状确定的恒星表面重力之间存在矛盾。我们认为光变曲线应该优先考虑，并相应地修改系统参数。对于给定质量和日照的氢氦行星，行星半径比理论半径大1 sigma。为了帮助规划未来的观测，我们提供了完善的凌日和掩星星历。
英文摘要：
We present photometry of 13 transits of XO-3b, a massive transiting planet on an eccentric orbit. Previous data led to two inconsistent estimates of the planetary radius. Our data strongly favor the smaller radius, with increased precision: R_p = 1.217 +/- 0.073 R_Jup. A conflict remains between the mean stellar density determined from the light curve, and the stellar surface gravity determined from the shapes of spectral lines. We argue the light curve should take precedence, and revise the system parameters accordingly. The planetary radius is about 1 sigma larger than the theoretical radius for a hydrogen-helium planet of the given mass and insolation. To help in planning future observations, we provide refined transit and occultation ephemerides.
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