Shanghai Astronomical Observatory Astrophysics Colloquium

Title：Drama Preceding the Deaths of Massive Stars

Zoom ID：859 2132 7090；Password：6360

Time：10:00am Sep. 22th (Thursday)（Special time）

Speaker：Prof. Jim Fuller（Caltech）

Abstract：

A renaissance in the astrophysics of massive stars is currently underway, driven by asteroseismology, supernovae, and gravitational wave observations. Asteroseismology of low-mass red giant stars measures the core rotation rates, informing new angular momentum transport models involving magnetic torques. Updated models based on the magnetic Tayler instability predict mostly slow rotation rates for white dwarfs, neutron stars, and black holes. An exception occurs for helium stars tidally spun up in binaries, allowing for highly spinning black holes and neutron stars. In the late phase evolution of massive stars approaching core-collapse, vigorous convection excites gravity waves that can carry huge amounts of energy within the star. Wave energy deposition near the surface can drive outbursts, expansion, and enhanced mass loss in the final years of massive star evolution, potentially leading to interaction-powered supernovae such as fast blue optical transients.

CV：

2017-current, Assistant Professor, California Institute of Technology

2013-2017, DuBridge Fellow, California Institute of Technology

2013-2017, KITP Fellow, Kavli Institute for Theoretical Physics

2014, Ph.D., Corell University

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