25个凌日系外行星系统中Trojan伴星和轨道偏心率的经验约束
Empirical Constraints on Trojan Companions and Orbital Eccentricities in 25 Transiting Exoplanetary Systems
摘要：
我们提出了一个寻找特洛伊同伴25过境系外行星。我们使用的技术福特和高迪，其中的差异是寻求观测到的渡越时间和渡越时间，通过拟合两体开普勒轨道的径向速度数据计算。这种技术对行星-恒星轨道L4/L5点的质量不平衡很敏感。未检测到高于2σ置信度的伴随物。对于GJ 436，2σ上限的中位数为56 M_（\earth），最大的约束极限为2.8 M_（\earth）。利用开普勒卫星任务即将获得的数据，以及确认凌日候选者所需的径向速度数据进行类似的调查，将对母星宜居带中10-50 M_ \earth特洛伊伴星敏感。作为这项研究的副产品，我们提出了经验约束的行星轨道的偏心率，包括那些以前被假定为圆形。偏心率的极限对于潮汐循环的研究和限制测量的行星半径中可能的系统误差以及预测的二次日食时间都是有意义的。
英文摘要：
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 2σconfidence. The median 2σupper limit is 56 M_\earth, and the most constraining limit is 2.8 M_\earth 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_\earth 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.
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