2719198

Target RA (J2000): 151.807037353516 and deg Target Dec (J2000): 46.1149787902832 and deg Gaia GMag: 9.154 Programme ID: CH_PR140085 Programme Manager: VENTURINI PI of observing programme: Benz Title of programme: Axis 1 - Towards an S-type radius valley determination (S-valley) Abstract: The number of planets orbiting binary stars has notably increased in the past three years thanks to follow-up of Tess Objects of Interest by direct imaging and GAIA. The demographic properties of planets in binaries are only starting to be unveiled. An important question to address for planets around binaries is that of the radius valley a deficit of exoplanets with 1.5 to 2.0 Earth radii found for planets orbiting single stars. A recent study by Sullivan et al. 2023 reports that no radius valley exists for S-type planets (planets in binaries orbiting only one of the stellar components). The study was performed with a sample of Kepler planets which suffers from large errors in the planetary radii. In addition the planets were assumed to orbit the primary star which adds an additional (and large) source of error in case a planet orbits in reality the secondary star. With this program we re-address the radius valley question by combining past observational data with new measurements from CHEOPS. [truncated! Please see actual data for full text]

目标赤经（J2000）：151.807037353516 度，目标赤纬（J2000）：46.1149787902832 度。盖亚（Gaia）G星等：9.154。项目编号：CH_PR140085。项目主管：VENTURINI。观测项目首席研究员：Benz。项目标题：轴1——迈向S型半径谷的确定（S型谷）。摘要：过去三年中，得益于对凌日系外行星巡天卫星（TESS）目标天体的直接成像后续观测以及盖亚（Gaia）卫星的观测数据，绕双星系统运行的系外行星数量显著增长。双星系统行星的群体统计特征才刚刚被揭开。针对双星周围行星的一个核心问题是：单星周围行星存在半径谷现象——即半径介于1.5至2.0倍地球半径的系外行星存在数量赤字。Sullivan等人2023年的最新研究指出，S型行星（仅绕双星系统其中一颗恒星运行的行星）不存在半径谷现象。该研究基于开普勒（Kepler）望远镜的行星样本开展，但该样本的行星半径测量误差较大。此外，研究默认行星均绕主星运行，若实际行星绕伴星运行，则会引入额外且显著的误差来源。本项目将结合过往观测数据与系外行星表征卫星（CHEOPS）的新观测数据，重新探讨半径谷问题。[已截断！请查看完整数据以获取全文]