2075258

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坐标系）：275.943817 度；目标赤纬（J2000坐标系）：-68.34489 度；盖亚（Gaia）G星等：9.05；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：证认长轨道周期小型凌日行星 摘要：凌日行星环绕明亮恒星运行，是表征系外行星大气与内部结构的核心研究对象。然而此类行星的绝大多数均拥有较短的轨道周期（P<20天），这是由于长轨道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学价值的研究目标之一：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弱。本项目将借助系外行星特征探测卫星（CHEOPS）高效探测可被完整表征的长轨道周期小型凌日行星。具体实现路径为：尽可能利用多类外部信息约束轨道周期，包括开普勒K2任务（K2）、凌星系外行星巡天卫星（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），以及现有条件下的视向速度（RV）数据。此类技术在CHEOPS标准任务中已获得成功应用，例如通过光度约束的TESS目标候选体（TOI）-2076 c与d（Osborn等，2022），或是TOI-561 d与e的单凌星+RV案例（Lacedelli等，2021及2022）。通过CHEOPS发现的这类行星，还可成为特邀观测者计划（GTO）扩展任务科学框架下其他研究方向的优质目标，比如研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。 [文本已截断！请查阅原始数据以获取完整内容]