Asteroseismic inference of the near-core magnetic field strength in the main sequence B star HD 43317
arXiv:2202.03440 · doi:10.1093/mnrasl/slac013
Abstract
About 10 per cent of intermediate- and high-mass dwarf stars are observed to host a strong large-scale magnetic field at their surface, which is thought to be of fossil field origin. However, there are few inferences as to the magnetic field strength and geometry within the deep interiors of stars. Considering that massive stars harbour a convective core whilst on the main sequence, asteroseismology of gravity (g) modes is able to provide constraints on their core masses, yet it has so far not been used to probe the strength of their interior magnetic fields. Here we use asteroseismology to constrain an upper limit for the magnetic field strength in the near-core region of the pulsating and magnetic B star HD 43317, based on the expected interaction of a magnetic field and its g modes. We find a magnetic field strength of order G is sufficient to suppress high-radial order g modes and reproduce the observed frequency spectrum of HD 43317, which contains only high-frequency g modes. This result is the first inference of the magnetic field strength inside a main-sequence star.
Accepted to MNRAS Letters
References in corpus (19)
- Modules for Experiments in Stellar Astrophysics (MESA)
- The Transiting Exoplanet Survey Satellite
- How mergers magnetise massive stars
- Probing the properties of convective cores through g modes: high-order g modes in SPB and gamma Doradus stars
- The MiMeS survey of magnetism in massive stars: Magnetic analysis of the O-type stars
- The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
- Angular momentum transport by heat-driven g-modes in slowly pulsating B stars
- Internal mixing of rotating stars inferred from dipole gravity modes
- Signatures of internal rotation discovered in the Kepler data of five slowly pulsating B stars
- Gravito-inertial and pressure modes detected in the B3 IV CoRoT target HD 43317
- The Magnetic Early B-type Stars I: Magnetometry and Rotation
- Asteroseismic masses, ages, and core properties of Doradus stars using gravito-inertial dipole modes and spectroscopy
- The Contour Method: a new approach to finding modes of non-adiabatic stellar pulsations
- The effects of surface fossil magnetic fields on massive star evolution: I. Magnetic field evolution, mass-loss quenching and magnetic braking
- Period spacings of gravity modes in rapidly rotating magnetic stars I. Axisymmetric fossil field with poloidal and toroidal components
- Conversion of Internal Gravity Waves into Magnetic Waves
- 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
- Magnetic characterization of the SPB/ Cep hybrid pulsator HD 43317
Cited by in corpus (33)
- X-Shooting ULLYSES: massive stars at low metallicity. I. Project Description
- Convective boundary mixing in main-sequence stars: theory and empirical constraints
- The effects of surface fossil magnetic fields on massive star evolution: IV. Grids of models at Solar, LMC, and SMC metallicities
- Asteroseismic g-mode period spacings in strongly magnetic rotating stars
- Gravity waves in strong magnetic fields
- Magnetism in High-Mass Stars
- Tidally perturbed g-mode pulsations in a sample of close eclipsing binaries
- Four bright eclipsing binaries with gamma Doradus pulsating components: CM Lac, MZ Lac, RX Dra and V2077 Cyg
- Mode identification and ensemble asteroseismology of 119 Cep stars detected by Gaia light curves and monitored by TESS
- An efficient tidal dissipation mechanism via stellar magnetic fields
- Multidimensional Simulations of Core Convection
- Stochastic excitation of internal gravity waves in rotating late F-type stars: A 3D simulation approach
- The Pre-main Sequence: Challenges and Prospects for Asteroseismology
- V456 Cyg: An eclipsing binary with tidally perturbed g-mode pulsations
- The ESO UVES/FEROS Large Programs of TESS OB pulsators. I. Global stellar parameters from high-resolution spectroscopy
- Magnetohydrodynamic simulations of A-type stars: Long-term evolution of core dynamo cycles
- HD 60431, the CP2 star with the shortest rotational period -- Physical parameters and period analysis
- A catalog of new slowly pulsating B-type stars
- Oscillations of red giant stars with magnetic damping in the core. I. Dissipation of mode energy in dipole-like magnetic fields
- Is planetary inward migration responsible for GJ 504's fast rotation and bright X-ray luminosity? New constraints from eROSITA
- Magnetic Webs in Stellar Radiative Zones
- Standing torsional Alfvén waves as the source of the rotational period variation in magnetic early-type stars
- Conversion and Damping of Nonaxisymmetric Internal Gravity Waves in Magnetized Stellar Cores
- On the Geometry of the Near-Core Magnetic Field in Massive Stars
- Seismic detection of core magnetic fields in red giants using the gravity offset
- Shaping core dynamos in A-type stars: The role of dipolar fossil fields
- Exploring the probing power of gamma-Dor's inertial dip for core magnetism: case of a toroidal field
- Asteroseismic detection of an internal magnetic field in the B0.5V pulsator HD 192575
- Evolution of proto-neutron stars to pulsars, magnetars and central compact objects
- Asteroseismology
- Co-existence of Internal Gravity Waves and Tayler-Spruit Magnetic Fields in the Radiative Core of Low-mass Stars
- Stellar Magnetism
- The symphony of pulsations and binarity among massive stars using HERMES spectroscopy and TESS photometry