2509072

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：7.84；项目编号：CH_PR140071；项目主管：绍博（SZABO）；观测项目首席研究员：本茨（Benz）；项目标题：方案1：借助CHEOPS开启年轻黄金系统AU Mic的宝库；摘要：AU Mic是一颗年龄约2200万年的活动M型恒星，已知拥有两颗处于9:4平均运动共振附近的凌星热海王星。凌星时间变化（Transit Timing Variations）暗示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的轨道周期存在7:4的自旋轨道共振。我们还发现凌星深度存在与恒星亮度强相关的系统性变化，这严重制约了行星半径的测量精度。AU Mic呈现较差自转，是已知具备赤道至极区黑子迁移现象的最年轻红恒星。AU Mic堪称行星与恒星物理学领域的年轻金矿，是一座亟待开启的宝库。得益于短周期空间测光能力，CHEOPS具备独一无二的条件来把握这一研究机遇。我们提议开展针对AU Mic的高强度CHEOPS观测计划。【文本已截断！完整内容请查阅实际数据集】