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从CoRoT航天任务VIII过境系外行星。CoRoT-7b:第一个有测量半径的超级地球

Transiting exoplanets from the CoRoT space mission VIII. CoRoT-7b: the first Super-Earth with measured radius

A. Leger, D. Rouan, J. Schneider, P. Barge, M. Fridlund, B. Samuel, M. Ollivier, E. Guenther, M. Deleuil, H. J. Deeg, M. Auvergne, R. Alonso, S. Aigrain, A. Ala… 展开作者

A. Leger, D. Rouan, J. Schneider, P. Barge, M. Fridlund, B. Samuel, M. Ollivier, E. Guenther, M. Deleuil, H. J. Deeg, M. Auvergne, R. Alonso, S. Aigrain, A. Alapini, J. M. Almenara, A. Baglin, M. Barbieri, H. Bruntt, P. Borde, F. Bouchy, J. Cabrera, C. Catala, L. Carone, S. Carpano, Sz. Csizmadia, R. Dvorak, A. Erikson, S. Ferraz-Mello, B. Foing, F. Fressin, D. Gandolfi, M. Gillon, Ph. Gondoin, O. Grasset, T. Guillot, A. Hatzes, G. Hebrard, L. Jorda, H. Lammer, A. Llebaria, B. Loeillet, M. Mayor, T. Mazeh, C. Moutou, M. Paetzold, F. Pont, D. Queloz, H Rauer, S. Renner, R. Samadi, A. Shporer, Ch. Sotin, B. Tingley, G. Wuchterl

摘要:

我们报告的发现非常浅(DF/F = 3.4 10-4),周期性下降的光变曲线的活动V = 11.7 G9 V星观察到的CoRoT卫星,我们解释为由于存在一个过境的同伴。我们描述了3色CoRoT数据和补充地面观测,支持同伴的行星性质。方法.我们使用CoRoT的颜色信息,良好的角分辨率地面测光观测在和出过境,自适应光学成像,近红外光谱和径向速度测量的初步结果,测试稀释日食二进制的情况。主恒星的参数来自光谱,然后与CoRoT光变曲线相结合,得出伴星的参数。我们仔细检查了所有可能的误报情况,所有测试都支持行星假说。分离大于0.40弧秒或三重系统的混合物几乎被排除在外,剩下的风险为8 10-4。我们的结论是,就我们已经穷尽,我们已经发现了一个行星伴侣,命名为CoRoT-7 b,我们得出的周期为0.853 59 +/- 3 10-5天,半径为Rp = 1.68 +/- 0.09 REarth。初步的径向速度数据分析产生的上限为21 MEarth的同伴质量,支持这一发现。CoRoT-7 b很可能是第一个有测量半径的超级地球。

英文摘要:

We report the discovery of very shallow (DF/F = 3.4 10-4), periodic dips in the light curve of an active V = 11.7 G9V star observed by the CoRoT satellite, which we interpret as due to the presence of a transiting companion. We describe the 3-colour CoRoT data and complementary ground-based observations that support the planetary nature of the companion. Methods. We use CoRoT color information, good angular resolution ground-based photometric observations in- and out- of transit, adaptive optics imaging, near-infrared spectroscopy and preliminary results from Radial Velocity measurements, to test the diluted eclipsing binary scenarios. The parameters of the host star are derived from optical spectra, which were then combined with the CoRoT light curve to derive parameters of the companion. We examine carefully all conceivable cases of false positives, and all tests performed support the planetary hypothesis. Blends with separation larger than 0.40 arcsec or triple systems are almost excluded with a 8 10-4 risk left. We conclude that, as far as we have been exhaustive, we have discovered a planetary companion, named CoRoT-7b, for which we derive a period of 0.853 59 +/- 3 10-5 day and a radius of Rp = 1.68 +/- 0.09 REarth. Analysis of preliminary radial velocity data yields an upper limit of 21 MEarth for the companion mass, supporting the finding. CoRoT-7b is very likely the first Super-Earth with a measured radius.

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