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Onset of non-linear internal gravity waves in intermediate-mass stars

Lookup NU author(s): Rathish Ratnasingam, Dr Philipp EdelmannORCiD, Professor Tamara Rogers

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Oxford University Press, 2019.

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Abstract

Internal gravity waves (IGW) propagate in the radiation zones of all stars. During propagation, their amplitudes are affected by two main features: radiative diffusion and density stratification. We have studied the implications of these two features on waves travelling within the radiative zones of non-rotating stars with stellar parameters obtained from the one-dimensional stellar evolution code, MESA. As a simple measure of induced wave dynamics, we define a criterion to see if waves can become non-linear and if so, under what conditions. This was done to understand the role IGW may play in angular momentum transport and mixing within stellar interiors. We find that the IGW generation spectrum, convective velocities, and the strength of density stratification all play major roles in whether waves become non-linear. With increasing stellar mass, there is an increasing trend in non-linear wave energies. The trends with different metallicities and ages depend on the generation spectrum.

Publication metadata

Author(s): Ratnasingam RP, Edelmann PVF, Rogers TM

Publication type: Article

Publication status: Published

Journal: Monthly Notices of the Royal Astronomical Society

Year: 2019

Volume: 482

Issue: 4

Pages: 5500-5512

Print publication date: 01/02/2019

Online publication date: 13/11/2018

Acceptance date: 09/11/2018

Date deposited: 01/02/2019

ISSN (print): 0035-8711

ISSN (electronic): 1365-2966

Publisher: Oxford University Press

URL: https://doi.org/10.1093/mnras/sty3086

DOI: 10.1093/mnras/sty3086

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