Fully compressible simulations of waves and core convection in main-sequence stars
arXiv:2006.03011 · doi:10.1051/0004-6361/202037531
Abstract
Context. Recent, nonlinear simulations of wave generation and propagation in full-star models have been carried out in the anelastic approximation using spectral methods. Although it makes long time steps possible, this approach excludes the physics of sound waves completely and rather high artificial viscosity and thermal diffusivity are needed for numerical stability. Direct comparison with observations is thus limited. Aims. We explore the capabilities of our compressible multidimensional hydrodynamics code SLH to simulate stellar oscillations. Methods. We compare some fundamental properties of internal gravity and pressure waves in 2D SLH simulations to linear wave theory using two test cases: (1) an interval gravity wave packet in the Boussinesq limit and (2) a realistic stellar model with a convective core and a radiative envelope. Oscillation properties of the stellar model are also discussed in the context of observations. Results. Our tests show that specialized low-Mach techniques are necessary when simulating oscillations in stellar interiors. Basic properties of internal gravity and pressure waves in our simulations are in good agreement with linear wave theory. As compared to anelastic simulations of the same stellar model, we can follow internal gravity waves of much lower frequencies. The temporal frequency spectra of velocity and temperature are flat and compatible with observed spectra of massive stars. Conclusion. The low-Mach compressible approach to hydrodynamical simulations of stellar oscillations is promising. Our simulations are less dissipative and require less luminosity boosting than comparable spectral simulations. The fully-compressible approach allows the coupling of gravity and pressure waves to be studied too.
Accepted for publication in A&A
References in corpus (15)
- Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
- Asteroseismic measurement of surface-to-core rotation in a main sequence A star, KIC 11145123
- The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
- Asteroseismology of solar-type stars
- Asteroseismic measurement of slow, nearly-uniform surface-to-core rotation in the main sequence F star KIC 9244992
- Low-frequency gravity waves in blue supergiants revealed by high-precision space photometry
- Signatures of internal rotation discovered in the Kepler data of five slowly pulsating B 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
- Diverse Variability of O and B Stars Revealed from 2-minute Cadence Light Curves in Sectors 1 and 2 of the TESS Mission: Selection of an Asteroseismic Sample
- New numerical solver for flows at various Mach numbers
- Theoretical seismology in 3D : nonlinear simulations of internal gravity waves in solar-like stars
- Low-frequency variability in massive stars: Core generation or surface phenomenon?
- Dependence of Convective Boundary Mixing on Boundary Properties and Turbulence Strength
- Two-Dimensional Simulations of Internal Gravity Waves in The Radiation Zones of Intermediate-Mass Stars
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