Transiting exoplanets from the CoRoT space mission IV. CoRoT-Exo-4b: a transiting planet in a 9.2 day synchronous orbit
Transiting exoplanets from the CoRoT space mission IV. CoRoT-Exo-4b: a transiting planet in a 9.2 day synchronous orbit
复制标题
CoRoT 太空任务 IV 中的凌日系外行星。
DOI：
10.1051/0004-6361:200810246
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发表时间：
2008
影响因子：
6.5
通讯作者：
Aigrain S
中科院分区：
文献类型：
--
作者：
Aigrain S
CoRoT是第一个基于空间的过境搜索，提供了超高精度的光变曲线，连续时间采样长达5个月。这使得可以检测周期相对较长的凌日行星，并同时研究宿主星星的光度变化。在这封信中，我们报告了凌日巨行星CoRoT-Exo-4 b的发现，并使用CoRoT光变曲线对凌日进行了详细的分析，并确定了恒星自转周期。对CoRoT光变曲线进行了预处理，以去除异常值，并校正轨道残差和由于探测器上的热像素造成的伪影。在去除每次凌日的恒星变化后，分析凌日光变曲线以确定凌日参数。利用离散自相关函数方法，从出凌光变曲线中得到了该星星的自转周期。我们确定行星轨道和星星自转的周期分别为9.20205±0.00037天和8.87±1.12天，这与这是一个同步系统是一致的。我们还推导出倾角（以度为单位）、轨道距离与恒星半径之比以及行星与星星半径之比。我们简要地讨论了行星的轨道周期和恒星自转周期之间的一致性及其对系统迁移和恒星-行星相互作用历史的可能影响。
CoRoT, the first space-based transit search, provides ultra-high-precision light curves with continuous time-sampling over periods of up to 5 months. This allows the detection of transiting planets with relatively long periods, and the simultaneous study of the host star's photometric variability. In this Letter, we report the discovery of the transiting giant planet CoRoT-Exo-4b and use the CoRoT light curve to perform a detailed analysis of the transit and determine the stellar rotation period. The CoRoT light curve was pre-processed to remove outliers and correct for orbital residuals and artefacts due to hot pixels on the detector. After removing stellar variability about each transit, the transit light curve was analysed to determine the transit parameters. A discrete autocorrelation function method was used to derive the rotation period of the star from the out-of-transit light curve. We determine the periods of the planetary orbit and star's rotation of 9.20205±0.00037 and 8.87±1.12 days respectively, which is consistent with this being a synchronised system. We also derive the inclination, in degrees, the ratio of the orbital distance to the stellar radius, , and the planet-to-star radius ratio . We discuss briefly the coincidence between the orbital period of the planet and the stellar rotation period and its possible implications for the system's migration and star-planet interaction history.