耶拿大学天文台对行星transit的观测：TrES-2
Planetary transit observations at the University Observatory Jena: TrES-2
摘要：
我们报告的几个过境事件的过境行星TrES-2的观测与卡塞格伦望远镜卡梅拉在耶拿大学天文台。在2007年3月至2008年11月期间，观测到10次不同的凌日，几乎是一个完整的轨道周期。总的来说，在40个夜晚的观测中，对TrES-2的母星进行了4291次曝光（总共71.52小时的观测）。根据TrES-2的凌日时间，从TrES网络、凌日光曲线项目和系外行星凌日数据库公布的34个事件加上我们自己的10次凌日，我们发现轨道周期为P=（2.470614 +/-0.00001）d，与之前公布的周期相比略有变化~0.6 s。我们为这颗凌日行星提供了新的星历表。此外，我们还发现凌日后的第二次下降，这可能是由于混合变星或第二颗恒星的掩星，甚至是系统中的另一个物体。我们的观察将是有用的时间变化所造成的额外的扰动行星和/或恒星斑点和/或卫星的未来调查。
英文摘要：
We report on observations of several transit events of the transiting planet TrES-2 obtained with the Cassegrain-Teleskop-Kamera at the University Observatory Jena. Between March 2007 and November 2008 ten different transits and almost a complete orbital period were observed. Overall, in 40 nights of observation 4291 exposures (in total 71.52 h of observation) of the TrES-2 parent star were taken. With the transit timings for TrES-2 from the 34 events published by the TrES-network, the Transit Light Curve project and the Exoplanet Transit Database plus our own ten transits, we find that the orbital period is P=(2.470614 +/- 0.000001) d, a slight change by ~0.6 s compared to the previously published period. We present new ephemeris for this transiting planet. Furthermore, we found a second dip after the transit which could either be due to a blended variable star or occultation of a second star or even an additional object in the system. Our observations will be useful for future investigations of timing variations caused by additional perturbing planets and/or stellar spots and/or moons.
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