Parameters and Predictions for the Long-Period Transiting Planet HD 17156b
Parameters and Predictions for the Long-Period Transiting Planet HD 17156b
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长周期凌日行星 HD 17156b 的参数和预测
DOI：
10.1086/588461
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
J. Langton
中科院分区：
文献类型：
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作者：
J. Irwin;D. Charbonneau;P. Nutzman;W. Welsh;A. Rajan;M. Hidas;T. Brown;T. Lister;D. Davies;G. Laughlin;J. Langton
我们报告高节奏的时间序列测光最近发现的过境系外行星系统HD 17156，跨越时间的过境UT 2007年10月1日，从三个独立的天文台。我们提出了一个联合分析，我们的测光，以前发表的径向速度测量，并为三个额外的事件的过境中心的时间。采用光谱测定的恒星质量和半径的值和不确定度，我们估计行星半径为Rp = 1.01 ± 0.09 RJup，倾角为i = 86.5+ 1.1−0.7 deg。我们发现凌日中心的时间为Tc = 2，454，374.8338 ± 0.0020 HJD，轨道周期为P = 21.21691 ± 0.00071天，并注意到迄今为止报告的四次凌日没有显示出时间变化的迹象，表明系统中存在第三个天体。我们的研究结果并不排除二次日食的存在，但意味着只有9.2%的机会出现这种情况，而二次日食是非掠食事件的概率更低（6.9%）。由于其偏心轨道和长周期，HD 17156 b是研究系外行星大气动力学的迷人对象。为了帮助这些未来的研究，我们提出的理论光变曲线的可见光半球的行星在整个轨道上的红外发射。
We report high-cadence time series photometry of the recently discovered transiting exoplanet system HD 17156, spanning the time of transit on UT 2007 October 1, from three separate observatories. We present a joint analysis of our photometry, previously published radial velocity measurements, and times of transit center for three additional events. Adopting the spectroscopically determined values and uncertainties for the stellar mass and radius, we estimate a planet radius of Rp = 1.01 ± 0.09 RJup and an inclination of i = 86.5+ 1.1−0.7 deg. We find a time of transit center of Tc = 2,454,374.8338 ± 0.0020 HJD and an orbital period of P = 21.21691 ± 0.00071 days and note that the four transits reported to date show no sign of timing variations that would indicate the presence of a third body in the system. Our results do not preclude the existence of a secondary eclipse, but imply that there is only a 9.2% chance for this to be present and an even lower probability (6.9%) that the secondary eclipse would be a nongrazing event. Due to its eccentric orbit and long period, HD 17156b is a fascinating object for the study of the dynamics of exoplanet atmospheres. To aid such future studies, we present theoretical light curves for the variable infrared emission from the visible hemisphere of the planet throughout its orbit.