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Target RA (J2000): 275.943817 and deg Target Dec (J2000): -68.34489 and deg Gaia GMag: 9.05 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（J2000.0坐标系）：275.943817 度
目标赤纬（J2000.0坐标系）：-68.34489 度
盖亚G星等：9.05
项目编号：CH_PR140079
项目主管：奥斯本（OSBORN）
观测项目首席研究员：本兹（Benz）
项目标题：轴1——“侦探CHEOPS”：证认长轨道周期小型凌日行星
摘要：凌绕明亮恒星的系外行星是表征系外行星大气与内部结构的关键研究对象。然而此类行星的绝大多数均拥有短轨道周期（P<20天），这是由于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。但这类行星却是最具科研价值的样本之一：与短周期伴行星不同，它们受宿主恒星的引力与电磁效应影响更弱。本项目将借助CHEOPS望远镜高效探测可开展表征研究的长轨道周期小型凌日行星。具体实现方式为：利用尽可能多的外部信息约束轨道周期，这些信息包括K2、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），以及现有径向速度数据。此类技术已在CHEOPS常规任务中取得成功，例如通过测光约束的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，还可成为GTO扩展任务科学框架中其他研究方向的优质目标，例如研究系外行星系统的结构多样性，乃至搜寻系外卫星与行星环。
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