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Astrophysics: Siyao Xu (Institute for Advanced Study)

Date February 9, 2023 @ 2:00 pm - 3:00 pm

Turbulence and star formation

Turbulence is an essential part of current paradigm of star formation. My research reveals a number of key impacts of turbulence that have been overlooked. (1) A significant deviation from the widely accepted Kolmogorov turbulence spectrum is found from observations of pulsars. It reveals the importance of compressible turbulence in making stars. (2) The breakdown of flux freezing by turbulence is found to be a promising solution to the long-standing magnetic flux problem of star formation. This prediction is recently tested and found to have important implications for the first star formation. (3) Turbulence is imprinted into motions of young stars, which is recently confirmed by Gaia observations. This entails far-reaching implications, including binary formation, eccentricity distribution of wide binaries, and formation channels of merging compact binaries.

 

Details

Date:
February 9, 2023
Time:
2:00 pm - 3:00 pm
Event Categories:
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Venue

2165 NPB