HD 17156b: A Transiting Planet with a 21.2 Day Period and an Eccentric Orbit
HD 17156b: A Transiting Planet with a 21.2 Day Period and an Eccentric Orbit
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HD 17156b：一颗周期为 21.2 天、轨道偏心的凌日行星
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
G. Sostero
中科院分区：
文献类型：
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作者：
M. Barbieri;R. Alonso;G. Laughlin;J. Almenara;R. Bissinger;Derek Davies;D. Gasparri;E. Guido;C. Lopresti;F. Manzini;G. Sostero
我们报告了V=8.17 G 0 V的星星HD 17156的3.1兆焦耳伴星的凌日探测。9月10日，三名独立观察员观察到了这次凌日。2007年9月10日（两个在意大利中部，一个在加那利群岛），他们分别在3.0σ、5.3σ和7.9σ的置信水平下获得检测结果。这些观测是在Transitsearch.org网络的主持下进行的，该网络在预计可能发生凌日的时间间隔内组织对已知的载有行星的恒星进行后续的光度凌日搜索。对7.9 σ数据集的分析表明，凌日深度d = 0.0062± 0.0004，凌日持续时间t = 186± 5 min。这些值与撞击参数B = a cos i/R = 0.8的较小行星的凌日相一致。这颗行星在已知的凌日系外行星中占据着独特的地位，这是由于它的轨道偏心率大（e = 0.67）和轨道周期长（P = 21.2d）。这颗行星在其轨道运行过程中接受26倍的日射变化，这将使其成为表征系外行星大气动力学的有用对象。
We report the detection of transits by the 3.1MJup companion to the V=8.17 G0V star HD 17156. The transit was observed by three independant observers on Sept. 9/10, 2007 (two in central Italy and one in the Canary Islands), who obtained detections at confidence levels of 3.0σ, 5.3σ, and 7.9σ, respectively. The observations were carried out under the auspices of the Transitsearch.org network, which organizes follow-up photometric transit searches of known planet-bearing stars during the time intervals when transits are expected to possibly occur. Analyses of the 7.9 σ data set indicates a transit depth d = 0.0062± 0.0004, and a transit duration t = 186± 5 min. These values are consistent with the transit of a Jupit er-sized planet with an impact parameter b = a cos i/R⋆∼ 0.8. This planet occupies a unique regime among known transiting extrasolar planets, both as a result of its large orbital ecc entricity (e = 0.67) and long orbital period (P = 21.2d). The planet receives a 26-fold variation in insolation d uring the course of its orbit, which will make it a useful object for characterization of exoplanetary atmospheric dynamics.