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Two-dimensional simulations of internal gravity waves in a 5 M⊙ zero-age-main-sequence model
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Le Saux, A., Baraffe, I., Guillet, T., Vlaykov, D. G., Morison, A., Pratt, J., Constantino, T. and Goffrey, Tom (2023) Two-dimensional simulations of internal gravity waves in a 5 M⊙ zero-age-main-sequence model. Monthly Notices of the Royal Astronomical Society, 522 (2). pp. 2835-2849. doi:10.1093/mnras/stad1067 ISSN 1365-2966.
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Official URL: https://doi.org/10.1093/mnras/stad1067
Abstract
Main-sequence intermediate-mass stars present a radiative envelope that supports internal gravity waves (IGWs). Excited at the boundary with the convective core, IGWs propagate towards the stellar surface and are suspected to impact physical processes such as rotation and chemical mixing. Using the fully compressible time-implicit code MUSIC, we study IGWs in two-dimensional simulations of a zero-age-main-sequence 5 solar mass star model up to 91% of the stellar radius with different luminosity and radiative diffusivity enhancements. Our results show that low frequency waves excited by core convection are strongly impacted by radiative effects as they propagate. This impact depends on the radial profile of radiative diffusivity which increases by almost 5 orders of magnitude between the centre of the star and the top of the simulation domain. In the upper layers of the simulation domain, we observe an increase of the temperature. Our study suggests that this is due to heat added in these layers by IGWs damped by radiative diffusion. We show that non-linear effects linked to large amplitude IGWs may be relevant just above the convective core. Both these effects are intensified by the artificial enhancement of the luminosity and radiative diffusivity, with enhancement factors up to 104 times the realistic values. Our results also highlight that direct comparison between numerical simulations with enhanced luminosity and observations must be made with caution. Finally, our work suggests that thermal effects linked to the damping of IGWs could have a non-negligible impact on stellar structure.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||
Library of Congress Subject Headings (LCSH): | Astroseismology, Hydrodynamics, Gravity waves -- Research, Stars, Oscillations | ||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||
Publisher: | Oxford University Press (OUP) | ||||||||||||
ISSN: | 1365-2966 | ||||||||||||
Official Date: | June 2023 | ||||||||||||
Dates: |
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Volume: | 522 | ||||||||||||
Number: | 2 | ||||||||||||
Page Range: | pp. 2835-2849 | ||||||||||||
DOI: | 10.1093/mnras/stad1067 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
Date of first compliant deposit: | 20 July 2023 | ||||||||||||
Date of first compliant Open Access: | 20 July 2023 | ||||||||||||
RIOXX Funder/Project Grant: |
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