The surface signal of gravity waves generated by massive star core convection
ORAL
Abstract
The cores of stars at least 20% more massive than the Sun are convective, and turbulent motions in the core launch gravity waves which may imprint upon the stellar surface in observable ways. We present the first 3D simulations of massive star convection extending from the star's center to near its surface, with realistic stellar luminosities. We measure both the luminosity of waves generated by the convective core and the features of those waves at the outer boundary of the simulations. Using the gravity wave eigenmodes of the simulation wave cavity, we construct a transfer function which accurately predicts the wave signal at the outer boundary given the wave luminosity. We then use this method to predict the observable consequences of gravity waves at the surfaces of massive stars.
*EHA was supported by a CIERA Postdoctoral Fellowship. This work was supported in part by NASA HTMS grant 80NSSC20K1280, NASA SSW grant 80NSSC19K0026, and NASA OSTFL grant 80NSSC22K1738. RHDT acknowledges support from NSF grants ACI-1663696, AST-1716436 and PHY-1748958, and NASA grant 80NSSC20K0515. The Center for Computational Astrophysics at the Flatiron Institute is supported by the Simons Foundation. This research was also supported in part by the National Science Foundation (NSF) under Grant Number NSF PHY-1748958.
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Publication: Anders et al 2023, Nature Astronomy: https://www.nature.com/articles/s41550-023-02040-7
Presenters
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Evan H Anders
- Northwestern University
- Northwestern