高阿尔法行星多波段成像巡天（MISHAPS）I：对47 Tucanae中热木星发生率的初步约束
The Multiband Imaging Survey for High-Alpha PlanetS (MISHAPS) I: Preliminary Constraints on the Occurrence Rate of Hot Jupiters in 47 Tucanae
AI总结：
利用MISHAPS巡天在47 Tucanae外围搜寻热木星，结合哈勃数据给出迄今最强发生率上限f_HJ<0.11%，比开普勒场低约4倍。
摘要：
第一代球状星团中的凌星行星搜寻未获得任何探测结果，事后看来，仅给出了略高于高金属丰度银盘厚盘实测发生率的限制。为改进这些限制，我们展示了在球状星团47 Tucanae中开展的一项新的宽视场热木星凌星搜寻的首批结果。作为高阿尔法行星多波段成像巡天（MISHAPS）的一部分，我们对47 Tuc进行了观测。利用CTIO 4米布兰科望远镜上的暗能量相机获得的24个部分和完整夜晚的观测数据，我们对星团外围区域的19,930颗恒星进行了搜寻。尽管我们没有发现明确的行星探测，但将我们的结果与Gilliland等人2000年利用哈勃望远镜对内部星团独立样本中34,091颗恒星的行星搜寻所给出的上限相结合，我们对周期为0.8 ≤ P ≤ 8.3天、半径0.5 R_Jup ≤ R_P ≤ 2.0 R_Jup的热木星给出了迄今最强的限制，即f_HJ < 0.11%，比开普勒视场中的发生率低约4倍。我们的搜寻发现了35个凌星行星候选体，但最终无需后续观测即可排除每一个。我们还发现了4个食双星，其中包括3颗此前未被编目的分离食双星。
英文摘要：
The first generation of transiting planet searches in globular clusters yielded no detections, and in hindsight, only placed occurrence rate limits slightly higher than the measured occurrence rate in the higher-metallicity Galactic thick disk. To improve these limits, we present the first results of a new wide field search for transiting hot Jupiters in the globular cluster 47~Tucanae. We have observed 47~Tuc as part of the Multiband Imaging Survey for High-Alpha Planets (MISHAPS). Using 24 partial and full nights of observations taken with the Dark Energy Camera on the 4-m Blanco telescope at CTIO, we perform a search on 19,930 stars in the outer regions of the cluster. Though we find no clear planet detections, by combining our result with the upper limit enabled by Gilliland et al.'s 2000 Hubble search for planets around an independent sample of 34,091 stars in the inner cluster, we place the strongest limit to date on hot Jupiters with periods of $0.8 \leq P \leq 8.3$ days and $0.5~R_{\rm Jup} \leq R_{\rm P} \leq 2.0~R_{\rm Jup}$ of $f_{\rm HJ} < 0.11\%$, a factor of ${\sim}$4 below the occurrence rate in the \textit{Kepler} field. Our search found 35 transiting planet candidates, though we are ultimately able to rule out each without follow-up observations. We also found 4 eclipsing binaries, including 3 previously-uncataloged detached eclipsing binary stars.
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