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Target RA (J2000): 3.955176 and deg Target Dec (J2000): 13.55619 and deg Gaia GMag: 11.39 Programme ID: CH_PR240007 PI of observing programme: Palethorpe Title of programme: CHEOPS can confirm an Earth-sized planet in the habitable zone of a metal-poor M-dwarf neighbour Abstract: The number of confirmed exoplanets has grown exponentially since the field was first established almost 30 years ago. However our understanding of how these planets form and evolve has been severely impacted by our ability to precisely characterise certain types of exoplanets. The characterisation of Earth-analogues in particular which are vital in gaining an understanding of our own planet’s history remains a very small pool. One such candidate first discovered by TESS is TOI-6251 b a nearby temperate Earth-sized planet orbiting a metal-poor M-dwarf. However multiples transits could have fallen in TESS’s data gaps – meaning that we are unable to conclusively state the period of the planet as either 12.7 or 25.5 days. Without this parameter the radius of the planet is unable to be precisely constrained meaning that even with our secured time to obtain high-precision RV observations from which the planets mass can be determined we would be unable to model the composition and interior structure. CHEOPS can confirm this habitable zone M dwarf planet however enabling us to further our knowledge on theories of how stellar compositional environment affects planetary internal structure as well as how planet formation and evolution has led to the observed density and radius valleys. With CHEOPS observations we can precisely pinpoint the orbital period and radius of TOI-6251 b – a planet of which the characterisation could unlock ground-breaking studies. [truncated! Please see actual data for full text]

目标赤经（J2000坐标系）：3.955176 度，目标赤纬（J2000坐标系）：13.55619 度，盖亚G星等（Gaia GMag）：11.39，项目编号：CH_PR240007，观测项目首席研究员：帕莱索普，项目标题：系外行星特征卫星（CHEOPS）可证认金属贫M矮星邻星宜居带内类地行星
摘要：自近30年前该领域创立以来，已证认的系外行星数量呈指数级增长。然而，我们对这类行星形成与演化的认知，严重受制于对特定类型系外行星进行精确特征描述的能力。其中，类地行星的特征描述工作仍进展寥寥，而这类行星对于理解地球自身的演化历史至关重要。由凌日系外行星巡天卫星（TESS）首次发现的TOI-6251 b便是一例：这是一颗位于宜居带附近、尺寸与地球相当的行星，围绕一颗金属贫M矮星运行。但此前TESS的观测数据存在间隙，可能覆盖了多次凌星事件，导致我们无法确切判定该行星的公转周期究竟为12.7天还是25.5天。缺少这一关键参数，便无法精确约束行星半径；即便我们已申请到获取高精度视向速度（RV）观测的时间以测定行星质量，仍无法对其成分与内部结构进行建模。
而系外行星特征卫星（CHEOPS）可对该宜居带M矮星行星完成证认，这将助力我们进一步完善相关理论：包括恒星成分环境如何影响行星内部结构，以及行星形成与演化如何造就了观测到的密度谷与半径谷。借助CHEOPS的观测数据，我们可以精确测定TOI-6251 b的公转周期与半径——对该行星的特征描述或将开启突破性的研究工作。
[已截断！完整文本请查阅原始数据]