论文标题
基于苔丝数据
Occurrence rate of hot Jupiters around early-type M dwarfs based on TESS data
论文作者
论文摘要
我们介绍了热jupiter的出现率($ 7 \ r _ {\ oplus} \ leq r_ {p} \ leq 2 \ r_ {j} $,$ 0.8 \ leq p_ {b leq p_ {b} \ leq 10 $ 10 $ days)在早期的M dwarfs周围的特定指令中,以teSS的态度进行了teSSS,以此为主要的特定。我们从苔丝输入目录中采用恒星参数,并以$ 10.5 \ leq t _ {\ rm mag} \ leq 13.5 $构造60,819 m矮人的样本,有效温度$ 2900 \ \ leq t _ {\ rm eff} m _ {\ ast} \ leq 0.65 \ m _ {\ odot} $。我们使用基于盒子最小平方搜索的检测管道进行了不知情的过境搜索,并通过注入和恢复实验表征了搜索完整性。我们结合了一系列审查步骤,包括光中心测量,奇数/偶数和次要日食分析,旋转和过境周期同步测试,以及检查地面光度法,光谱和成像观察结果。最后,我们发现总共九个行星候选人,所有这些都是已知的感兴趣的苔丝对象。对于满足我们选择标准的早期类型的热木星,我们获得了$ 0.27 \ pm0.09 \%$ $ 0.27 \ pm0.09 \%$。与以前的研究相比,早期型矮人周围的热木星的发生率小于FGK恒星的所有测量值,尽管它们在1--2 $σ$之内保持一致。结合了传输,径向速度和微透明调查的结果,我们发现围绕早期型的热木马可能显示出可能显示出较高的急剧降低,每次对数半马约尔轴的发生率较高,$ {$ {{{\ rm d} n} n} n} n}/{\ rm d}
We present an estimate of the occurrence rate of hot Jupiters ($7\ R_{\oplus}\leq R_{p}\leq 2\ R_{J}$, $0.8 \leq P_{b}\leq 10$ days) around early-type M dwarfs based on stars observed by TESS during its Primary Mission. We adopt stellar parameters from the TESS Input Catalog, and construct a sample of 60,819 M dwarfs with $10.5 \leq T_{\rm mag}\leq 13.5$, effective temperature $2900 \leq T_{\rm eff}\leq 4000\ K$ and stellar mass $0.45\leq M_{\ast}\leq 0.65\ M_{\odot}$. We conduct a uninformed transit search using a detection pipeline based on the box least square search and characterize the searching completeness through an injection and recovery experiment. We combine a series of vetting steps including light centroid measurement, odd/even and secondary eclipse analysis, rotation and transit period synchronization tests as well as inspecting the ground-based photometric, spectroscopic and imaging observations. Finally, we find a total of nine planet candidates, all of which are known TESS objects of interest. We obtain an occurrence rate of $0.27\pm0.09\%$ for hot Jupiters around early-type M dwarfs that satisfy our selection criteria. Compared with previous studies, the occurrence rate of hot Jupiters around early-type M dwarfs is smaller than all measurements for FGK stars, although they are consistent within 1--2$σ$. Combining results from transit, radial velocity and microlensing surveys, we find that hot Jupiters around early-type M dwarfs possibly show a steeper decrease in occurrence rate per logarithmic semi-major axis bin (${{\rm d}N}/{\rm d}\log_{10} a$) when compared with FGK stars.