Three-Dimensional Simulations of Massive Stars: II. Age Dependence
arXiv:2307.15109 · doi:10.3847/1538-4357/ace9db
Abstract
We present 3D full star simulations, reaching up to 90% of the total stellar radius, for three stars of different ages (ZAMS, midMS and TAMS). A comparison with several theoretical prescriptions shows the generation spectra for all three ages are dominated by convective plumes. Two distinct overshooting layers are observed, with most plumes stopped within the layer situated directly above the convective boundary (CB); overshooting to the second, deeper layer becomes increasingly more infrequent with stellar age. Internal gravity wave (IGW) propagation is significantly impacted in the midMS and TAMS models as a result of some IGWs getting trapped within their Brunt-Väisälä frequency spikes. A fundamental change in the wave structure across radius is also observed, driven by the effect of density stratification on IGW propagation causing waves to become evanescent within the radiative zone, with older stars being affected more strongly. We find that the steepness of the frequency spectrum at the surface increases from ZAMS to the older models, with older stars also showing more modes in their spectra.
24 pages, 14 figures / Accepted at ApJ
References in corpus (24)
- Modules for Experiments in Stellar Astrophysics (MESA)
- Angular momentum transport by heat-driven g-modes in slowly pulsating B stars
- Low-frequency gravity waves in blue supergiants revealed by high-precision space photometry
- Heartbeat Stars, Tidally Excited Oscillations, and Resonance Locking
- Angular Momentum Transport via Internal Gravity Waves in Evolving Stars
- Three-Dimensional Simulations of Massive Stars: I. Wave Generation and Propagation
- Photometric detection of internal gravity waves in upper main-sequence stars. II. Combined TESS photometry and high-resolution spectroscopy
- The interior angular momentum of core hydrogen burning stars from gravity-mode oscillations
- Theoretical seismology in 3D : nonlinear simulations of internal gravity waves in solar-like stars
- Numerical Simulations of Penetration and Overshoot in the Sun
- Angular momentum redistribution by mixed modes in evolved low-mass stars. II. Spin-down of the core of red giants induced by mixed modes
- Can plume-induced internal gravity waves regulate the core rotation of subgiant stars?
- Fully compressible simulations of waves and core convection in main-sequence stars
- Asteroseismology of evolved stars to constrain the internal transport of angular momentum. I. Efficiency of transport during the subgiant phase
- Angular momentum redistribution by mixed modes in evolved low-mass stars. I. Theoretical formalism
- Low-frequency variability in massive stars: Core generation or surface phenomenon?
- The angular momentum transport by unstable toroidal magnetic fields
- Extreme value statistics for two-dimensional convective penetration in a pre-Main Sequence star
- Two-Dimensional Simulations of Internal Gravity Waves in The Radiation Zones of Intermediate-Mass Stars
- What Prevents Internal Gravity Waves From Disturbing the Solar Uniform Rotation?
- Stochastic light variations in hot stars from wind instability: Finding photometric signatures and testing against the TESS data
- Spherical-shell boundaries for two-dimensional compressible convection in a star
- Two-dimensional simulations of internal gravity waves in a 5 Zero-Age-Main-Sequence model
- On the effect of overshooting as predicted by the modelling of the pre-main sequence evolution of a 2 solar-mass star