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Target RA (J2000): 311.289703 and deg Target Dec (J2000): -31.34090 and deg Gaia GMag: 7.84 Programme ID: CH_PR140071 Programme Manager: SZABO PI of observing programme: Benz Title of programme: Axis 1 - Opening the treasure chest of the young golden system AU Mic with CHEOPS Abstract: AU Mic is a young (~22 Myr) active M1 star known to host two transiting warm Neptunes close to the 9:4 mean-motion resonance. Transit Timing Variations suggest that an additional resonant planet is likely present in the system. The rotation period of the star and the orbital period of AU Mic b are in a 7:4 spin-orbit commensurability. We also foundThere are systematic variations in the transit depth that correlate with the stars brightness strongly hampering the accuracy on the planetary radii. AU Mic displays differential rotation making it the youngest ``red star known to feature equator-to-pole spot migration. AU Mic is a ``young goldmine for planetary and stellar physics a treasure chest just waiting to be opened. Thanks to its short-cadence space-born photometry CHEOPS is uniquely well suited to seize this opportunity. We propose to carry out an intensive CHEOPS observing campaign of AU Mic. [truncated! Please see actual data for full text]

目标赤经（J2000）：311.289703度 目标赤纬（J2000）：-31.34090度 盖亚G星等（Gaia GMag）：7.84 项目ID：CH_PR140071 项目主管：SZABO 观测项目首席研究员：Benz 项目标题：轴1——利用CHEOPS开启年轻黄金系统AU Mic的宝藏箱 摘要：AU Mic是一颗年轻（约22百万年）的活跃M1型恒星，已知拥有两颗处于9:4平均运动共振（mean-motion resonance）附近的凌星温暖海王星。凌星时间变化（Transit Timing Variations）表明该系统中可能存在另一颗共振行星。恒星的自转周期与AU Mic b的轨道周期呈7:4的自旋轨道共动性（spin-orbit commensurability）。我们还发现，凌星深度存在系统性变化，且与恒星亮度相关，这严重影响了行星半径的测量精度。AU Mic表现出差自转（differential rotation）现象，使其成为已知具有赤道到两极黑子迁移特征的最年轻“红矮星”。AU Mic是行星物理学与恒星物理学的“年轻金矿”，一个亟待开启的宝藏箱。凭借其短曝光间隔的天基测光（space-born photometry）能力，CHEOPS是捕捉这一机遇的理想工具。我们提议开展针对AU Mic的密集CHEOPS观测活动。 [truncated! Please see actual data for full text]