arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2210.08313astro-ph.EPastro-ph.SR
收藏

基于 TESS 数据的早型 M 矮星周围热木星发生率

Occurrence rate of hot Jupiters around early-type M dwarfs based on TESS data

Tianjun Gan, Sharon X. Wang, Songhu Wang, Shude Mao, Chelsea X. Huang, Karen A. Collins, Keivan G. Stassun, Avi Shporer, Wei Zhu, George R. Ricker, Roland Vande… 展开作者

Tianjun Gan, Sharon X. Wang, Songhu Wang, Shude Mao, Chelsea X. Huang, Karen A. Collins, Keivan G. Stassun, Avi Shporer, Wei Zhu, George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins, Khalid Barkaoui, Alexander A. Belinski, David R. Ciardi, Phil Evans, Eric Girardin, Nataliia A. Maslennikova, Tsevi Mazeh, Aviad Panahi, Francisco J. Pozuelos, Don J. Radford, Richard P. Schwarz, Joseph D. Twicken, Anaël Wünsche, Shay Zucker

AI总结:

本文利用 TESS 主要任务数据,对 60,819 颗早型 M 矮星开展无先验凌星搜索与注入恢复分析,测得热木星发生率为 0.27±0.09%,并指出其随半长轴可能比 FGK 恒星下降更快。

摘要:

我们基于 TESS 在其主要任务期间观测的恒星,给出了早型 M 矮星周围热木星(7 R⊕ ≤ Rp ≤ 2 RJ,0.8 ≤ Pb ≤ 10 天)发生率的估计。我们采用 TESS Input Catalog 中的恒星参数,并构建了一个包含 60,819 颗 M 矮星的样本,其条件为 10.5 ≤ Tmag ≤ 13.5、有效温度 2900 ≤ Teff ≤ 4000 K、恒星质量 0.45 ≤ M* ≤ 0.65 M⊙。我们使用基于盒最小二乘搜索的探测流程进行无先验信息凌星搜索,并通过注入与恢复实验来表征搜索完备性。我们结合了一系列甄别步骤,包括光心测量、奇偶凌星与次食分析、自转与凌星周期同步性检验,以及检查地面测光、光谱和成像观测。最终,我们共发现 9 个行星候选体,且它们全部是已知的 TESS 感兴趣天体。对于满足我们选择标准的早型 M 矮星,我们得到热木星的发生率为 0.27±0.09%。与以往研究相比,早型 M 矮星周围热木星的发生率低于针对 FGK 恒星的所有测量结果,尽管它们在 1–2σ 范围内是一致的。综合凌星、视向速度和微引力透镜巡天的结果,我们发现,与 FGK 恒星相比,早型 M 矮星周围的热木星在每个对数半长轴 bin 中的发生率(dN/d log10 a)可能表现出更陡峭的下降。

英文摘要:

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.

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。

↑