2210785

Target RA (J2000): 357.351196 and deg Target Dec (J2000): 36.90078 and deg Gaia GMag: 9.96 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历元）：357.351196 度；目标赤纬（J2000.0历元）：36.90078 度；盖亚（Gaia）G星等：9.96；项目编号：CH_PR140079；项目主管：OSBORN；观测项目首席研究员（Principal Investigator，PI）：Benz；项目标题：任务轴1——系外行星特征探测卫星（CHEOPS）探案计划：证认长轨道周期小型凌日行星；项目摘要：环绕明亮恒星运行的凌日行星，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都拥有较短的轨道周期（P<20天），这是因为长周期凌日行星无法在测光巡天数据中产生连续的凌星事件。但这类行星却是最具研究价值的目标之一：与轨道周期更短的同伴行星不同，它们受宿主恒星的引力与电磁效应影响更弱。本项目将借助系外行星特征探测卫星（CHEOPS），高效探测可被表征的长轨道周期小型凌日行星。我们将通过多源外部信息约束轨道周期：从K2、TESS等测光巡天数据中获取非连续凌星事件（即单次、双次或三次凌星候选体），并在条件允许时利用径向速度数据。此类技术在系外行星特征探测卫星（CHEOPS）的常规任务中已取得成功，例如通过测光约束得到的TOI-2076 c与d（Osborn等人，2022），或是结合单次凌星与径向速度数据的TOI-561 d与e（Lacedelli等人，2021及2022）。通过CHEOPS发现的这类行星，还可作为GTO扩展任务科学框架内其他研究方向的优质观测目标，例如探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。【文本已截断！完整内容请查阅原始数据】