论文标题
用小光圈望远镜监测过渡系外行星及其宿主星
Monitoring of transiting exoplanets and their host stars with small aperture telescopes
论文作者
论文摘要
现在，系外行星研究的目标是富裕的系统，使得高需求观察者很难在很长一段时间内进行后续观察。我们研究了使用0.4m级望远镜监测过境热木星及其宿主星的有效性。我们考虑了两项代表性的案例研究：WASP-52B，具有13个新的过渡，HAT-P-23B，具有17个新的过渡和同时进行的光度监测覆盖78天。我们介绍了更新的系统参数，并将新的运输时间与先前发布的结果相结合，以计算两个系统的新ephemerides。我们对WASP-52B中期中期的分析会导致对二次胚胎的偏爱（$Δχ_ν^2 = 0.07 $，$ΔBIC= 1.53 $而不是线性胚片。我们讨论了这种Quadratic Ephemeris的现实MS〜yr^{ - 1}} $，并考虑了先前的出版物的活跃星，但在我们的新分析中没有看到这样的事件。在案例研究中，我们将其解释为HAT-P-23的旋转时期的7.015天，我们将其解释为HAT-P-23的旋转期。
Exoplanet research is now target rich with a wide diversity of systems making it difficult for high demand observatories to undertake follow up observations over extended periods of time. We investigate the effectiveness of using 0.4m-class telescopes for monitoring transiting hot Jupiters and their host stars. We consider two representative case studies: WASP-52b with 13 new transits, and HAT-P-23b with 17 new transits and concurrent photometric monitoring covering 78 days. We present updated system parameters and combine our new transit times with previously published results to calculate new ephemerides for both systems. Our analysis of transit mid-times for WASP-52b results in a slight preference for a quadratic ephemeris ($Δχ_ν^2 = 0.07$, $ΔBIC = 1.53$ over a linear ephemeris. We discuss the reality of this quadratic ephemeris indicating a period change of $ δP / δt = -38.6\pm4{\rm ms~yr^{-1}}$ and consider possible causes. WASP-52 is known to be an active star with previous publications reporting many spot crossing events, however no such events are seen in our new photometry. Our analysis shows that WASP-52 is still active and that the latitude of the spots has likely migrated away from the transit chord. We confirm the inflated nature and circular orbit for HAT-P-23b. Our monitoring of HAT-P-23 reveals a periodicity of 7.015 days with an amplitude of 0.011 mag which we interpret as the rotation period of HAT-P-23. The photometric and transit timing precision achieved in the case studies shows that this class of telescope is capable of precise characterisation and long-term monitoring of transiting hot Jupiters in support of dedicated ongoing and future ground and space based observations.
