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