Tidal Evolution with Internal Gravity Waves
Title：Tidal Evolution with Internal Gravity Waves
Speaker：Linhao Ma (California Institute of Technology)
Location：Large conference room, 3rd floor
Time：3:00pm, Jan.12th, Friday
Abstract：
Internal gravity waves (IGWs) exist in radiative zones inside a star, and when tidally excited by a nearby companion, they could cause efficient tidal dissipation with radiative damping, shaping the spin and orbital evolution of the system. In this talk, I will talk about their effects in different kinds of astrophysical systems. For a Wolf-Rayet-black-hole binary, tidally excited IGWs may efficiently transfer the orbital angular momentum to the Wolf-Rayet star, which may collapse to a fast-rotating black hole at the end of its lifetime. For binaries containing a sub-dwarf B (sdB) star, these waves may help them to achieve tidal synchronization, which can be directly compared to asteroseismic observations of sdBs. For main-sequence stars with a close-in planet, IGWs may trigger resonance locking, causing steady orbital migration of the planet, and the orbital distribution of these planets will hence depend on the properties of their host stars.
CV：
Linhao Ma is a PhD candidate at the California Institute of Technology. He is now working with Professor Jim Fuller on the tidal interactions in stars and binaries. His research also covers topics in theoretical astrophysics, including massive stars, stellar pulsations, and galactic dynamics.附件下载：
