Probing the internal magnetism of stars using asymptotic magneto-asteroseismology
arXiv:2012.11050 · doi:10.1051/0004-6361/202039180
Abstract
Our knowledge of the dynamics of stars has undergone a revolution thanks to the simultaneous large amount of high-quality photometric observations collected by space-based asteroseismology and ground-based high-precision spectropolarimetry. They allowed us to probe the internal rotation of stars and their surface magnetism in the whole Hertzsprung-Russell diagram. However, new methods should still be developed to probe the deep magnetic fields in those stars. Our goal is to provide seismic diagnoses that allow us to sound the internal magnetism of stars. Here, we focus on asymptotic low-frequency gravity modes and high-frequency acoustic modes. Using a first-order perturbative theory, we derive magnetic splittings of their frequencies as explicit functions of stellar parameters. As in the case of rotation, we show how asymptotic gravity and acoustic modes can allow us to probe the different components of the magnetic field in the cavities where they propagate. This demonstrates again the high potential of using mixed-modes when this is possible.
arXiv comment12 pages, 4 figures, accepted for publication in Astronomy and Astrophysics
References in corpus (47)
- Modules for Experiments in Stellar Astrophysics (MESA)
- The Transiting Exoplanet Survey Satellite
- The PLATO 2.0 Mission
- Dynamo action by differential rotation in a stably stratified stellar interior
- Magnetic fields of non-degenerate stars
- GYRE: An open-source stellar oscillation code based on a new Magnus Multiple Shooting Scheme
- Fast core rotation in red-giant stars revealed by gravity-dominated mixed modes
- A fossil origin for the magnetic fields of A-stars and white dwarfs
- Spin down of the core rotation in red giants
- Seismic evidence for a rapidly rotating core in a lower-giant-branch star observed with Kepler
- Slowing the Spins of Stellar Cores
- Seismic constraints on the radial dependence of the internal rotation profiles of six Kepler subgiants and young red giants
- Probing the interior physics of stars through asteroseismology
- Seismic diagnostics for transport of angular momentum in stars 1. Rotational splittings from the PMS to the RGB
- Angular Momentum Transport in Stellar Interiors
- Angular momentum transport within evolved low-mass stars
- The MiMeS Survey of Magnetism in Massive Stars: Introduction and overview
- The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
- Angular momentum transport in stellar interiors constrained by rotational splittings of mixed modes in red giants
- Seismic evidence for a weak radial differential rotation in intermediate-mass core helium burning stars
- Asteroseismology of solar-type stars
- Giant star seismology
- General Cosmography Model with Spatial Curvature
- Core rotation braking on the red giant branch for various mass ranges
- Transport and mixing in the radiation zones of rotating stars II. Axisymmetric magnetic field
- The Rotation Of The Deep Solar Layers
- Seismic diagnostics for transport of angular momentum in stars 2. Interpreting observed rotational splittings of slowly-rotating red giant stars
- On the sensitivity of gravito-inertial modes to differential rotation in intermediate-mass main-sequence stars
- Nearly-uniform internal rotation of solar-like main-sequence stars revealed by space-based asteroseismology and spectroscopic measurements
- Understanding angular momentum transport in red giants: the case of KIC 7341231
- The Magnetic Fields at the Surface of Active Single G-K Giants
- γ Doradus stars as test of angular momentum transport models
- Asteroseismic signatures of evolving internal stellar magnetic fields
- Sensitivity of helioseismic gravity modes to the dynamics of the solar core
- Angular momentum transport efficiency in post-main sequence low-mass stars
- Seismic evidence for near solid-body rotation in two Kepler subgiants and implications for angular momentum transport
- Period spacings of Doradus pulsators in the Kepler field: detection methods and application to 22 slow rotators
- Deciphering the oscillation spectrum of Doradus and SPB stars
- First evidence of inertial modes in Doradus stars: The core rotation revealed
- Period spacings of gravity modes in rapidly rotating magnetic stars I. Axisymmetric fossil field with poloidal and toroidal components
- Probing the internal magnetic field of slowly pulsating B-stars through g modes
- Detecting axisymmetric magnetic fields using gravity modes in intermediate-mass stars
- Period spacings of gravity modes in rapidly rotating magnetic stars II. The case of an oblique dipolar fossil magnetic field
- Stellar oscillations. II The non-adiabatic case
- Probing the internal solar magnetic field through g-modes
- The Traditional Approximation of Rotation including the centrifugal acceleration for slightly deformed stars
- The Effect of Toroidal Magnetic Fields on Solar Oscillation Frequencies