2356339

Target RA (J2000): 139.231171 and deg Target Dec (J2000): -20.67631 and deg Gaia GMag: 11.51 Programme ID: CH_PR140079 Programme Manager: OSBORN PI of observing programme: Benz Title of programme: Axis 1 - DETECTIVE CHEOPS: Confirming small transiting planets on long orbital periods Abstract: Transiting planets orbiting bright stars are key for the characterisation of exoplanet atmospheres and internal structures. However the vast majority of such planets have short (P<20d) orbital periods. This is because long-period transiting planets do not produce consecutive transits in photometric survey data. However these planets are some of the most interesting as unlike their interior companions they are less affected by the gravitational and electromagnetic effects of their host stars. This programme will use CHEOPS to efficiently detect characterisable small transiting planets on long orbital periods. We will do this by leveraging as much external information as possible to constrain orbital periods - from nonconsecutive transits (i.e. mono- duo- or trio-transit candidates) in photometric survey data such as K2 or TESS and from radial velocities where available. Such techniques have been successful in the CHEOPS nominal mission with for example the photometrically-constrained TOI-2076 c and d (Osborn et al 2022) or the monotransit+RV case of TOI-561 d and e (Lacedelli et al 2021 and 2022). These planets once found by CHEOPS may also form interesting science targets for other parts of the GTO extended mission science case such as studying the architectural diversity of exoplanetary systems and even searches for exomoon and rings. [truncated! Please see actual data for full text]

目标赤经（J2000坐标系）：139.231171 度，目标赤纬（J2000坐标系）：-20.67631 度，盖亚（Gaia）G星等：11.51，项目编号：CH_PR140079，项目主管：OSBORN，观测项目首席研究员：Benz，项目名称：轴1 - DETECTIVE CHEOPS：验证长轨道周期小型凌星行星
摘要：凌绕明亮恒星运行的行星是表征系外行星大气与内部结构的核心研究对象。但当前绝大多数此类行星的轨道周期均较短（P<20天），究其原因，长轨道周期凌星行星无法在测光巡天数据中产生连续凌星事件。然而这类行星却极具科研价值：与短周期伴星不同，它们受宿主恒星的引力与电磁效应影响更为微弱。本项目将借助系外行星特征探测卫星（CHEOPS）高效探测具备可表征性的长轨道周期小型凌星行星。具体实施路径为：充分整合多源外部信息以约束轨道周期，这些信息包括K2、TESS等测光巡天项目中的非连续凌星候选体（即单次、双次或三次凌星事件），以及现有可用的径向速度（radial velocity）观测数据。此类技术已在CHEOPS常规任务中获得成功，例如受测光数据约束的TOI（TESS目标天体）-2076 c与d（Osborn等，2022），或是结合单次凌星与径向速度数据的TOI-561 d与e（Lacedelli等，2021、2022）。通过CHEOPS发现的这类行星，还可成为客座观测时间（GTO）扩展任务科学框架中的优质科研目标，例如系外行星系统构型多样性研究，乃至系外卫星与行星环的搜寻工作。
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