EMPIRICAL CONSTRAINTS ON TROJAN COMPANIONS AND ORBITAL ECCENTRICITIES IN 25 TRANSITING EXOPLANETARY SYSTEMS
EMPIRICAL CONSTRAINTS ON TROJAN COMPANIONS AND ORBITAL ECCENTRICITIES IN 25 TRANSITING EXOPLANETARY SYSTEMS
复制标题
25 个凌日系外行星系统中特洛伊伴星和轨道偏心率的经验约束
DOI：
10.1088/0004-637x/693/1/784
复制
发表时间：
2008
期刊：
影响因子：
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通讯作者：
J. Winn
中科院分区：
文献类型：
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作者：
N. Madhusudhan;J. Winn
我们对 25 颗凌日系外行星的特洛伊同伴进行了搜索。我们使用福特和高迪的技术，其中寻找观测到的渡越时间与通过将二体开普勒轨道拟合到径向速度数据而计算出的渡越时间之间的差异。该技术对行星-恒星轨道 L4/L5 点的质量不平衡很敏感。未检测到置信度高于 2σ 的同伴。对于 GJ 436 来说，中值 2σ 上限为 56 M⊕，最大限制为 2.8 M⊕。使用开普勒卫星任务即将发布的数据以及确认凌日候选者所需的径向速度数据进行的类似调查，将对位于其母星宜居带中的 10-50 M⊕ 特洛伊伴星敏感。作为这项研究的副产品，我们提出了对行星轨道偏心率的经验约束，包括那些以前被假设为圆形的轨道。偏心率的限制对于潮汐圆化的研究以及限制测量的行星半径和预测的二次食时间中可能的系统误差很重要。
We present a search for Trojan companions to 25 transiting exoplanets. We use the technique of Ford & Gaudi, in which a difference is sought between the observed transit time and the transit time that is calculated by fitting a two-body Keplerian orbit to the radial-velocity data. This technique is sensitive to the imbalance of mass at the L4/L5 points of the planet–star orbit. No companions were detected above 2σ confidence. The median 2σ upper limit is 56 M⊕, and the most constraining limit is 2.8 M⊕ for the case of GJ 436. A similar survey using forthcoming data from the Kepler satellite mission, along with the radial-velocity data that will be needed to confirm transit candidates, will be sensitive to 10–50 M⊕ Trojan companions in the habitable zones of their parent stars. As a by-product of this study, we present empirical constraints on the eccentricities of the planetary orbits, including those which have previously been assumed to be circular. The limits on eccentricity are of interest for investigations of tidal circularization and for bounding possible systematic errors in the measured planetary radii and the predicted times of secondary eclipses.
DOI：
10.1111/j.1745-3933.2008.00465.x
发表时间：
2008-01
影响因子：
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作者：
D. Anderson;M. Gillon;C. Hellier;P. Maxted;F. Pepe;D. Queloz;D. Wilson;A. Cameron;B. Smalley;T. Lister;T. Lister;S. Bentley;A. Blecha;D. Christian;B. Enoch;L. Hebb;K. Horne;J. Irwin;Y. Joshi;S. Kane;M. Marmier;M. Mayor;N. Parley;D. Pollacco;F. Pont;R. Ryans;D. Ségransan;I. Skillen;R. Street;R. Street;R. Street;S. Udry;R. West;P. Wheatley
通讯作者：
D. Anderson;M. Gillon;C. Hellier;P. Maxted;F. Pepe;D. Queloz;D. Wilson;A. Cameron;B. Smalley;T. Lister;T. Lister;S. Bentley;A. Blecha;D. Christian;B. Enoch;L. Hebb;K. Horne;J. Irwin;Y. Joshi;S. Kane;M. Marmier;M. Mayor;N. Parley;D. Pollacco;F. Pont;R. Ryans;D. Ségransan;I. Skillen;R. Street;R. Street;R. Street;S. Udry;R. West;P. Wheatley