2542580

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坐标系）：311.289703 度
目标赤纬（J2000坐标系）：-31.34090 度
盖亚G星等（Gaia GMag）：7.84
项目编号：CH_PR140071
项目主管：SZABO
观测项目首席研究员：Benz
项目名称：轴1——借助CHEOPS揭开年轻恒星系统显微镜座AU星（AU Mic）的珍贵宝藏
摘要：显微镜座AU星（AU Mic）是一颗年龄约2200万年的活动M1型恒星，已知其拥有两颗处于9:4平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行星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系统性变化，且与恒星亮度强相关，这严重制约了行星半径的测量精度。显微镜座AU星呈现较差自转现象，是目前已知最年轻的存在赤道至极向黑子迁移的“红恒星”。显微镜座AU星是行星物理学与恒星物理学研究的“年轻金矿”，宛如一座静待开启的宝藏。得益于其短积分时间空间测光能力，CHEOPS拥有独一无二的绝佳条件来把握这一研究机遇。我们提议针对显微镜座AU星开展一项密集的CHEOPS观测计划。
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