2095616

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 star's 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坐标系）：311.289703 度
目标赤纬（J2000坐标系）：-31.34090 度
盖亚（Gaia）G星等：7.84
项目编号：CH_PR140071
项目主管：SZABO
观测项目首席研究员：Benz
项目标题：专题1——借助CHEOPS开启年轻黄金系统AU Mic的宝藏宝库
摘要：AU Mic是一颗年轻（约2200万年）的活动M1型恒星，已知其拥有两颗靠近9:4平运动共振的凌星温暖海王星类行星。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。该恒星的自转周期与AU Mic b的轨道周期满足7:4的自旋轨道共谐关系。我们还发现，凌星深度存在与恒星亮度相关的系统性变化，这严重制约了行星半径的测量精度。AU Mic存在较差自转，使其成为已知的最年轻的具备赤道至极区黑子迁移现象的“红”恒星。AU Mic是行星物理学与恒星物理学领域的“年轻金矿”，宛如一座静待开启的宝藏宝库。得益于CHEOPS的短积分空间测光能力，它得天独厚地适配这一观测机遇。我们提议开展针对AU Mic的高强度CHEOPS观测计划。
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