论文标题
基于地面的Unistellar望远镜网络观察到的开普勒167 E的16小时过境
A 16 Hour Transit of Kepler-167 e Observed by the Ground-based Unistellar Telescope Network
论文作者
论文摘要
已经确认了5,000多个系外行星，其中近4,000种通过过境方法发现。但是，很少有过境的系外行星的轨道周期大于100天。在这里，我们报告了使用Unistellar基于地面的望远镜网络的“木星类似物”系开普勒-167 E的过境检测，其旋转的K4恒星为1,071天。从2021年11月18日至20日，位于九个不同国家的公民天文学家收集了43次观察，涵盖了16小时长的过境。使用嵌套采样方法结合和适合观察结果，我们检测到了eutc 2021 11月19日17:20:51的中期时间，其1 $σ$不确定性为9.8分钟，使其成为有史以来最长的pheriod行星，从地面上检测到了它的过境。这是开普勒167 E的第四次过境检测，但第一个从地面制成。这种时序测量可以完善轨道，并使沿着无需空间望远镜的轨道保持最新状态。这样的观察结果表明，小型望远镜的协调网络可以识别和表征具有较长轨道时期的行星的能力。
More than 5,000 exoplanets have been confirmed and among them almost 4,000 were discovered by the transit method. However, few transiting exoplanets have an orbital period greater than 100 days. Here we report a transit detection of Kepler-167 e, a "Jupiter analog" exoplanet orbiting a K4 star with a period of 1,071 days, using the Unistellar ground-based telescope network. From 2021 November 18 to 20, citizen astronomers located in nine different countries gathered 43 observations, covering the 16 hour long transit. Using a nested sampling approach to combine and fit the observations, we detected the mid-transit time to be UTC 2021 November 19 17:20:51 with a 1$σ$ uncertainty of 9.8 minutes, making it the longest-period planet to ever have its transit detected from the ground. This is the fourth transit detection of Kepler-167 e, but the first made from the ground. This timing measurement refines the orbit and keeps the ephemeris up to date without requiring space telescopes. Observations like this demonstrate the capabilities of coordinated networks of small telescopes to identify and characterize planets with long orbital periods.
