TESS 测光巡天中亚巨星周围行星的出现率
The Occurrence Rate of Planets Around Subgiant Stars from TESS Photometric Survey
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中文总结 AI 辅助
基于 TESS 数据对 282,904 颗亚巨星进行统一凌星分析，测得 1-10 天周期内完备性校正的行星出现率为 0.644，并揭示半径依赖特征，为研究主序后早期行星演化提供基线。
中文摘要 AI 辅助
亚巨星代表了恒星演化中的一个关键阶段，为研究行星系统如何响应主序后早期膨胀阶段提供了机会。尽管它们很重要，但与主序星和红巨星宿主相比，对这一星族的系统性出现率研究仍然稀少。在本工作中，我们对从 Gaia DR3 星表选出的 282,904 颗亚巨星样本进行了行星出现率的统一分析。我们独立地重新分析了 TESS 光变曲线，用于凌星信号的探测和优化，随后进行了多阶段筛选，包括目视检查和统计性假阳性评估。我们通过注入-回收实验量化了巡天的探测灵敏度，在恒星样本中注入了 565,808 个合成凌星信号。在 1--10 天的周期范围和探测完备性得到充分表征的行星半径范围内，我们测得经完备性校正的行星出现率为 0.644^{+0.048}_{-0.041}。该出现率强烈依赖于行星半径，最高出现率由 1-4 R_earth 范围内的行星贡献，并在 12-15 R_earth 处出现次级增强。这些结果为研究处于主序后早期演化恒星周围的近距离行星群提供了星族基线。
英文摘要
Subgiant stars represent a critical phase in stellar evolution, offering an opportunity to investigate how planetary systems respond to the early stages of post-main-sequence expansion. Despite their importance, systematic occurrence-rate studies of this population remain sparse compared with those of main-sequence and red-giant hosts. In this work, we present a uniform analysis of planet occurrence around a sample of 282,904 subgiant stars selected from the Gaia DR3 catalogue. We perform an independent reanalysis of TESS light curves for transit-signal detection and refinement, followed by multi-stage vetting including visual inspection and statistical false-positive assessment. We quantify the detection sensitivity of the survey through injection-and-recovery experiments, with 565,808 synthetic transit signals injected across the stellar sample. Over the period range of 1--10 days and the planet-radius range for which the detection completeness is well characterised, we measure a completeness-corrected planet occurrence rate of 0.644^{+0.048}_{-0.041}. The occurrence rate is strongly dependent on planet radius, with the highest occurrence contributed by planets in the 1-4 R_earth range and a secondary enhancement at 12-15 R_earth. These results provide a demographic baseline for studying the population of close-in planets around stars undergoing early post-main-sequence evolution.
发表机构
- Indian Institute of Science Education and Research Kolkata（印度科学教育研究所加尔各答分校）
- Tata Institute of Fundamental Research（塔塔基础研究所）
- Thüringer Landessternwarte Tautenburg（图林根州陶滕堡天文台）
机构由 AI 辅助整理，请以论文原文为准。
