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Journal Article

Accurate Short-Characteristics Radiative Transfer in A Numerical Tool for Astrophysical RESearch (ANTARES)

MPS-Authors

Kostogryz,  Nadiia M.
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;
ERC Synergy Grant: Untangling the complex physical mechanisms behind our eruptive star and its twins (WHOLESUN), Max Planck Institute for Solar System Research, Max Planck Society;

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Kupka,  Friedrich
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

Krüger,  Daniel
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

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Gizon,  Laurent
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Kostogryz, N. M., Kupka, F., Piskunov, N., Fabbian, D., Krüger, D., & Gizon, L. (2021). Accurate Short-Characteristics Radiative Transfer in A Numerical Tool for Astrophysical RESearch (ANTARES). Solar Physics, 296: 46. doi:10.1007/s11207-021-01777-6.


Cite as: https://hdl.handle.net/21.11116/0000-0008-4C2F-0
Abstract
We aim to improve the accuracy of radiative energy transport in three-dimensional radiation hydrodynamical simulations in ANTARES (A Numerical Tool for Astrophysical RESearch). We implement in the ANTARES short-characteristics numerical schemes a modification of the Bézier interpolant solver. This method yields a smoother surface structure in simulations of solar convection and reduces the artifacts appearing due to the limited number of rays along which the integration is done. Reducing such artifacts leads to increased stability of the code. We show that our new implementation achieves a better agreement of the temperature structure and its gradient with a semi-empirical model derived from observations, as well as of synthetic spectral-line profiles with the observed solar spectrum.