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SUMMARY:Surprising impacts of gravity waves - Dr. Jim Fuller - Caltech
DTSTART:20211101T150000Z
DTEND:20211101T160000Z
UID:TALK162478@talks.cam.ac.uk
CONTACT:Zhao Guo
DESCRIPTION:Gravity waves are low frequency fluid oscillations restored by
  buoyancy forces in planetary and stellar interiors\, but their astrophysi
 cal importance has only been recently appreciated. In red giant stars\, as
 teroseismically detectable gravity modes propagate into the degenerate cor
 e of the star\, providing a measurement of its structure and mass. In many
  cases\, these modes appear to be suppressed by a core magnetic field\, al
 lowing for tight constraints on internal stellar magnetism. The gravity mo
 de spectrum can also exhibit a unique asteroseismic fingerprint of a merge
 r event in a star’s past. In the planet Saturn\, gravity modes have been
  detected by using its rings as a giant seismograph\, revealing that the p
 lanet contains a large and diffuse core. Gravity modes can also be resonan
 tly tidally excited in binary systems such as heartbeat stars\, causing en
 ergy dissipation and tidally induced migration. A resonance locking proces
 s with tidally excited modes appears to be at work in the Saturn system\, 
 evidenced by the surprisingly rapid outward migration of its largest moon\
 , Titan.
LOCATION:Online
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