论文标题
旋转红色巨星的热木星的出现率
Occurrence rate of hot Jupiters orbiting red giant stars
论文作者
论文摘要
热木星形成了一个神秘的对象类别，但具有不清楚的形成途径。确定其发生率是功能轨道，行星和恒星质量以及系统年龄，这可能是了解它们形成方式的重要组成部分。迄今为止，已经发现了各种热的木星，绕着红色巨星旋转，并得出发病率将非常有趣。在这项研究中，我们旨在确定红色巨人样品样本中的热木星的数量，估计它们的发生率，并将其与A，F和G型恒星进行比较。选择了使用Gaia与NASA TESS Mission的观察相吻合的14474颗红色巨星的样本，估计有2至5 $ r_ \ odot $估计的半径。随后，将苔丝光曲线从热木星中搜索。使用注入的信号确定检测效率，结果进一步校正了几何传输概率以估计发生率。除其他感兴趣的苔丝对象外，还发现了三个先前确认的热木星，还有两个M型warf伴侣。这导致出现率为$ 0.37^{+0.29} _ { - 0.09} $％。由于尚未确定的不确定性，这与A-，F型和G型星无法区别。我们认为，在扩大红色巨人方面的吞噬行星不太可能在该样本中起着重要作用。
Hot Jupiters form an enigmatic class of object with yet unclear formation pathways. Determination of their occurrence rates as function orbit, planet and stellar mass, and system age, can be an important ingredient for understanding how they form. To date, various Hot Jupiters have been discovered orbiting red giant stars and deriving their incidence would be highly interesting. In this study we aim to determine the number of Hot Jupiters in a well-defined sample of red giants, estimate their occurrence rate and compare it with that for A, F and G-type stars. A sample of 14474 red giant stars, with estimated radii between 2 and 5 $R_\odot$, was selected using Gaia to coincide with observations by the NASA TESS mission. Subsequently, the TESS light curves were searched for transits from Hot Jupiters. The detection efficiency was determined using injected signals, and the results further corrected for the geometric transit probability to estimate the occurrence rate. Three previously confirmed Hot Jupiters were found in the TESS data, in addition to one other TESS Object of Interest, and two M-dwarf companions. This results in an occurrence rate of $0.37^{+0.29}_{-0.09}$%. Due to the yet large uncertainties, this cannot be distinguished from that of A-, F- and G-type stars. We argue that it is unlikely that planet engulfment in expanding red giants plays yet an important role in this sample.
