Evolution of random initial magnetic fields in stably stratified and barotropic stars

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dc.contributor.authorBecerra, Laura
dc.contributor.authorReisenegger, Andreas
dc.contributor.authorAlejandro Valdivia, Juan
dc.contributor.authorGusakov, Mikhail E.
dc.date.accessioned2025-01-20T21:09:21Z
dc.date.available2025-01-20T21:09:21Z
dc.date.issued2022
dc.description.abstractLong-lived magnetic fields are known to exist in upper main-sequence stars, white dwarfs, and neutron stars. In order to explore possible equilibrium configurations of the magnetic field inside these stars, we have performed 3D magnetohydrodynamic simulations of the evolution of initially random magnetic fields in stably stratified and barotropic stars with an ideal-gas equation of state using the pencil code, a high-order finite-difference code for compressible hydrodynamic flows in the presence of magnetic fields. In barotropic (isentropic) stars, we confirm previous results in the sense that all initial magnetic fields we tried decay away, unable to reach a stable equilibrium. In the case of stably stratified stars (with radially increasing specific entropy), initially random magnetic fields appear to always evolve to a stable equilibrium. However, the nature of this equilibrium depends on the dissipation mechanisms considered. If magnetic diffusivity (or hyper-diffusivity) is included, the final state is more axially symmetric and dominated by large wavelengths than the initial state, whereas this is not the case if only viscosity (or hyper-viscosity) is present. In real stars, the main mechanism allowing them to relax to equilibrium is likely to be phase mixing, which we argue is more closely mimicked by viscosity. Therefore, we conclude that, depending on its formation mechanism, the equilibrium magnetic field in these stars could in principle be very asymmetric.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stac102
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stac102
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93526
dc.identifier.wosidWOS:000770033800019
dc.issue.numero1
dc.language.isoen
dc.pagina.final745
dc.pagina.inicio732
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectMHD
dc.subjectsoftware: simulations
dc.subjectstars: magnetic field
dc.subjectstars: massive
dc.subjectstars: neutron
dc.subjectstars: white dwarfs
dc.titleEvolution of random initial magnetic fields in stably stratified and barotropic stars
dc.typeartículo
dc.volumen511
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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