对HST在47个图格里克地区行星搜索结果的再评价
Reassessment of the Null Result of the HST Search for Planets in 47 Tucanae
摘要：
我们重新审视哈勃太空望远镜在球状星团47 Tuccenda中寻找凌日行星的零结果，根据开普勒任务对行星发生的改进知识。吉利兰和同事们预计将发现17颗行星，假设这47颗图克星拥有与1999年之前调查的邻近恒星相同的特征和出现率的近距离巨行星。我们通过假设47个Tuc和开普勒恒星具有相同的行星种群来更新这一结果。修订后的预期检测数量为$4.0^{+1.7}_{-1.4}$。当我们将开普勒恒星的质量限制在与47 Tuc中搜索的恒星相同的范围内时，预期检测到的数量减少到$2.2^{+1.6}_{-1.1}$。因此，HST搜索的空结果在统计学上不如最初看起来那么显著。我们甚至不能拒绝一个极端的假设，即47个Tuc和开普勒恒星具有相同的行星种群，具有2-3个以上的$σ$意义。需要更敏感的搜索来比较球状星团和场星的行星数量。
英文摘要：
We revisit the null result of the Hubble Space Telescope search for transiting planets in the globular cluster 47 Tucanae, in the light of improved knowledge of planet occurrence from the Kepler mission. Gilliland and co-workers expected to find 17 planets, assuming the 47 Tuc stars have close-in giant planets with the same characteristics and occurrence rate as those of the nearby stars that had been surveyed up until 1999. We update this result by assuming that 47 Tuc and Kepler stars have identical planet populations. The revised number of expected detections is $4.0^{+1.7}_{-1.4}$. When we restrict the Kepler stars to the same range of masses as the stars that were searched in 47 Tuc, the number of expected detections is reduced to $2.2^{+1.6}_{-1.1}$. Thus, the null result of the HST search is less statistically significant than it originally seemed. We cannot reject even the extreme hypothesis that 47 Tuc and Kepler stars have the same planet populations, with more than 2-3$σ$ significance. More sensitive searches are needed to allow comparisons between the planet populations of globular clusters and field stars.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
