论文标题
基于PSF的趋势群集高质量数据（Pathos）-III的方法。通过他们的变量，北极和候选系外行星探索年轻协会的特性
A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) -- III. Exploring the properties of young associations through their variables, dippers, and candidate exoplanets
论文作者
论文摘要
恒星形成区域的年轻协会是恒星系统，使我们能够理解恒星早期及其周围发生的事情的特征的机制。特别是，对年轻恒星周围的磁盘和系外行星的分析使我们能够了解其进化中盛行的关键过程，并了解绕较老恒星的外球星星的特性。 TESS的任务使我们有机会以高准确性提取和分析关联成员的光曲线，但是影响这些区域的拥挤使光曲线提取困难。在悲伤项目中，最先进的工具用于提取高精度的光曲线，并在开放式群集和关联中识别可变恒星和过渡系外行星。在这项工作中，我分析了五个年轻（$ \ Lessim 10 $ Myr）关联的星星的光曲线，以寻找变量和候选系外行星。通过使用协会成员的旋转期，我限制了五个恒星系统的年龄（$ \ sim 2 $ - $ 10 $ MYR）。我搜索了北极光，并研究了形成偶然磁盘的灰尘的特性。最后，我搜索了过境信号，发现了6个强大的候选系外行星。与期望一致，没有检测到半径$ r _ {\ rm p} \ lyssim 0.9 r_j $的候选者。巨型行星的频率导致$ \ sim $ 2-3％，高于预期的（$ \ \ lyssim 1 $％）；低统计数据使得这一结论并不强烈，并且必须对年轻物体进行新的调查以确认这一结果。
Young associations in star forming regions are stellar systems that allow us to understand the mechanisms that characterise the stars in their early life and what happens around them. In particular, the analysis of the disks and of the exoplanets around young stars allows us to know the key processes that prevail in their evolution and understand the properties of the exoplanets orbiting older stars. The TESS mission is giving us the opportunity to extract and analyse the light curves of association members with high accuracy, but the crowding that affects these regions makes difficult the light curve extraction. In the PATHOS project, cutting-edge tools are used to extract high-precision light curves and identify variable stars and transiting exoplanets in open clusters and associations. In this work, I analysed the light curves of stars in five young ($\lesssim 10$ Myr) associations, searching for variables and candidate exoplanets. By using the rotational periods of the association members, I constrained the ages of the five stellar systems ($\sim 2$-$10$ Myr). I searched for dippers and I investigated the properties of the dust that forms the circumstellar disks. Finally, I searched for transiting signals, finding 6 strong candidate exoplanets. No candidates with radius $R_{\rm P}\lesssim 0.9 R_J$ have been detected, in agreement with the expectations. The frequency of giant planets resulted to be $\sim$2-3 %, higher than that expected for field stars ($\lesssim 1$ %); the low statistic makes this conclusion not strong, and new investigations on young objects are mandatory to confirm this result.
