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天文系讲座Astronomy Seminar 2025#18 | Fei Dai: Resonant Chains as the Initial Configuration of Kepler-like Planetary Systems
时间
2025年6月24日(星期二)
下午14:00-15:00
地点
西湖大学云谷校区E5-329A
主持
西湖大学天文系讲席教授 毛淑德
受众
全体师生
分类
学术与研究
天文系讲座Astronomy Seminar 2025#18 | Fei Dai: Resonant Chains as the Initial Configuration of Kepler-like Planetary Systems
时间:2025年6月24日(星期二)下午14:00-15:00
Time: 14:00-15:00, June 24th (Tuesday, Beijing Time), 2025
主持人:西湖大学天文系讲席教授 毛淑德
Host: Prof. Shude Mao, Chair Professor, School of Science
地点:西湖大学云谷校区E5-329A
Venue: E5-329A, Yungu Campus, Westlake University
报告语言:英语
Language: English
Prof. Fei Dai,
Assistant Professor, University of Hawaii
主讲人/Speaker:
Dr. Dai is currently a faculty member at the Institute for Astronomy, University of Hawaii. Previously, he was a NASA Sagan Fellow at Caltech. He earned his PhD in Physics from MIT and his Bachelor's degree from the University of Cambridge.
摘要/Abstract:
Ancient philosophers like Pythagoras and Kepler speculated that the planets of the Solar System might be arranged in resonant orbits—where their periods follow simple integer ratios (e.g., 3:2, 2:1)—as part of a Grand Design. However, except for Neptune and Pluto, the current-day Solar System planets are largely non-resonant. Similarly, most of the ~1000 confirmed exoplanetary systems (typical age of ~5 Gyr old) also exhibit non-resonant configurations. Our work recently revealed that the vast majority (~80%) of planetary systems younger than 100 Myr appear near (but not in) mean-motion resonance. We also found the fraction of resonant systems decreases steadily with time. In this talk, I will discuss how convergent disk migration naturally leads to the formation of resonant planetary chains and how subsequent dynamical evolution disrupts these resonances. I will also highlight how transit timing variations (TTVs) can serve as a powerful tool to probe the dynamic state of young planetary systems. Resonant-chain planetary systems serve as ideal testbeds for the evolution of planetary atmospheres. Finally, I will compare and contrast the non-resonant Solar System with near-resonant young planetary systems.
联系人/Contact:
School of Science, Yannan Yu, Email: yuyannan@westlake.edu.cn