3037667

Target RA (J2000): 139.231170654297 and deg Target Dec (J2000): -20.6763095855713 and deg Gaia GMag: 11.515 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历元）：139.231170654297 度；目标赤纬（J2000历元）：-20.6763095855713 度；盖亚G星等（Gaia GMag）：11.515；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——侦探CHEOPS计划：证认长轨道周期小型凌日行星

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。然而目前此类行星的绝大多数样本轨道周期均较短（P<20天），究其原因，长周期凌日行星无法在测光巡天数据中产生连续凌星事件。但这类行星恰恰是最具科研价值的目标之一：与短轨道周期伴星不同，它们受宿主恒星的引力与电磁效应干扰更弱。本项目将借助系外行星特征卫星（CHEOPS），高效探测可被详细表征的长轨道周期小型凌日行星。具体实现路径为：充分利用多源外部信息约束轨道周期，包括来自K2、凌日系外行星巡天卫星（Transiting Exoplanet Survey Satellite，简称TESS）等测光巡天数据中的非连续凌星事件（即单次、双次或三次凌星候选体），以及现有径向速度观测数据。此类技术已在CHEOPS常规任务中获得成功，例如通过测光约束的TESS目标候选体（TESS Object of Interest，简称TOI）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，同时也可成为GTO扩展任务科学框架下其他研究方向的优质目标，例如探究系外行星系统的构型多样性，甚至开展系外卫星与行星环的搜寻工作。

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