报告题目：On the Spin-axis Dynamics of Planets

报 告 人：Dr. Gongjie Li, Harvard/Georgia Tech

报告时间：2017-12-07 14:00

报告地点：蒙民伟科技南楼 S727

报告摘要：The variation of a planet's obliquity plays an important role in determining its climate, and the existence of massive satellites can influence such variations. For instance, the Earth's obliquity is stabilized by the Moon, and would undergo chaotic variations without the Moon. To quantify this, I will present a simplified perturbative approach, and demonstrate that without the Moon, the stochastic change in the Earth's obliquity allows high variabilities (~40 degrees) in billion-year timescales. In addition, I will discuss spin-axis dynamics of exoplanets, with applications to compact systems as well as habitable zone planet Kepler-186f.