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arXiv 1002.1857astro-ph.EP
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利用双星的食定时探测环联行星--数值模拟

Detecting circumbinary planets using eclipse timing of binary stars - numerical simulations

P. Sybilski, M. Konacki, S. Kozłowski

摘要:

在一个近距离食双星的轨道上存在一个天体,这是通过光时间效应影响到食的观测时间来表现的,因为近距离双星和环双星都围绕着共同的质心运动。这一事实与日食发生的周期性相结合,可以用来探测伴星。如果日食的时间有足够的精确度,日食的时间可以用来探测亚恒星甚至行星质量的伴星。本文的主要目标是研究基于光度学的双星食定时作为探测环双星行星的方法的潜力。在模型中,我们假设伴星在圆形开普勒轨道上绕着一颗双星运行。我们分析了空间和地面测光的情况下。特别是,我们研究的有用性正在进行的COROT和开普勒任务在检测环双星行星。我们还探讨了行星发现空间与双星的物理参数和它们的光变曲线的几何参数之间的关系。我们进行了详细的数值模拟的日食时序采用一个相对现实的模型的食双星的光变曲线。研究了白、红光度噪声对计时精度的影响。我们确定的灵敏度的日食计时技术,以环联行星的地面和空间为基础的光度观测。对日食计时方法的最佳观测目标、观测策略和仪器提出了建议。最后,我们比较了日食计时作为行星探测方法与径向速度和天体测量。

英文摘要:

The presence of a body in an orbit around a close eclipsing binary star manifests itself through the light time effect influencing the observed times of eclipses as the close binary and the circumbinary companion both move around the common centre of mass. This fact combined with the periodicity with which the eclipses occur can be used to detect the companion. Given a sufficient precision of the times of eclipses, the eclipse timing can be employed to detect substellar or even planetary mass companions. The main goal of the paper is to investigate the potential of the photometry based eclipse timing of binary stars as a method of detecting circumbinary planets. In the models we assume that the companion orbits a binary star in a circular Keplerian orbit. We analyze both the space and ground based photometry cases. In particular, we study the usefulness of the on-going COROT and Kepler missions in detecting circumbinary planets. We also explore the relations binding the planet discovery space with the physical parameters of the binaries and the geometrical parameters of their light curves. We carry out detailed numerical simulations of the eclipse timing by employing a relatively realistic model of the light curves of eclipsing binary stars. We study the influence of the white and red photometric noises on the timing precision. We determine the sensitivity of the eclipse timing technique to circumbinary planets for the ground and space based photometric observations. We provide suggestions for the best targets, observing strategies and instruments for the eclipse timing method. Finally, we compare the eclipse timing as a planet detection method with the radial velocities and astrometry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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