Two-dimensional simulations of internal gravity waves in the radiation zones of intermediate-mass stars

Ratnasingam, Rathish P.; Edelmann, Philipp Valentin Ferdinand; Rogers, Tamara M.

doi:10.1093/mnras/staa2296

Two-dimensional simulations of internal gravity waves in the radiation zones of intermediate-mass stars

Journal Article · Fri Aug 07 00:00:00 EDT 2020 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/staa2296· OSTI ID:1711405

^[1]; ^[2]; Rogers, Tamara M. ^[3]

Newcastle Univ. (United Kingdom)
Newcastle Univ. (United Kingdom); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Newcastle Univ. (United Kingdom); Planetary Science Inst., Tucson, AZ (United States)

Intermediate-mass main-sequence stars have large radiative envelopes overlying convective cores. This configuration allows internal gravity waves (IGWs) generated at the convective–radiative interface to propagate towards the stellar surface. The signatures of these waves can be observed in the photometric and spectroscopic data from stars. Here, we have studied the propagation of these IGWs using two-dimensional (2D) fully non-linear hydrodynamical simulations with realistic stellar reference states from the 1D stellar evolution code, Modules for Stellar Astrophysics (MESA). When a single wave is forced, we observe wave self-interaction. When two waves are forced, we observe non-linear interaction (i.e. triadic interaction) between these waves forming waves at different wavelengths and frequencies. When a spectrum of waves similar to that found in numerical simulations is forced, we find that the surface IGW frequency slope is consistent with recent observations. This power law is similar to that predicted by linear theory for the wave propagation, with small deviations that can be an effect of non-linearities. When the same generation spectrum is applied to 3 M_⊙ models at different stellar rotation and ages, the surface IGW spectrum slope is very similar to the generation spectrum slope.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Aeronautic and Space Administration (NASA); Science and Technology Facilities Council (STFC) (United Kingdom); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1711405

Report Number(s):: LA-UR--20-24392

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 497; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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