2088886

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
Gaia G星等：7.84
项目编号：CH_PR140071
项目主管：SZABO
观测项目首席科学家：Benz
项目标题：Axis1——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2200万年）的活跃M1型恒星，已知拥有两颗凌星的温暖海王星，二者接近9:4的平均运动共振。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-轨道共动关系（spin-orbit commensurability）。我们还发现，凌星深度存在系统性变化，且与恒星亮度强相关，这严重影响了行星半径的测量精度。AU Mic表现出较差自转（differential rotation），使其成为已知拥有赤道到极区黑子迁移现象的最年轻“红色”恒星。AU Mic是行星与恒星物理学研究的“年轻金矿”，一个亟待开启的宝藏箱。得益于CHEOPS提供的短时间分辨率空间测光数据（photometry），CHEOPS是把握这一机遇的理想工具。我们提议对AU Mic开展密集的CHEOPS观测 campaign。
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