Onset of Nonlinear Internal Gravity Waves in Intermediate-Mass Stars

Abstract

Internal gravity waves (IGW) propagate in the radiation zones of all stars. During propagation, their amplitudes are affected by two main features: radiative diffusion and density stratification. We have studied the implications of these two features on waves traveling within the radiative zones of non-rotating stars with stellar parameters obtained from the one dimensional stellar evolution code, MESA. As a simple measure of induced wave dynamics, we define a criterion to see if waves can become nonlinear and if so, under what conditions. This was done to understand the role IGW may play in angular momentum transport and mixing within stellar interiors. We find that the IGW generation spectrum, convective velocities and the strength of density stratification all play major roles in whether waves become nonlinear. With increasing stellar mass, there is an increasing trend in nonlinear wave energies. The trends with different metallicities and ages depend on the generation spectrum.

arXiv commentAccepted for publication in MNRAS, 14 pages including 11 figures

References in corpus (22)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Fast core rotation in red-giant stars revealed by gravity-dominated mixed modes
• Seismic evidence for a rapidly rotating core in a lower-giant-branch star observed with Kepler
• Influence of gravity waves on the internal rotation and Li abundance of solar-type stars
• Internal Gravity Waves in Massive Stars: Angular Momentum Transport
• Angular momentum redistribution by waves in the Sun
• Internal Gravity Waves Modulate the Apparent Misalignment of Exoplanets around Hot Stars
• Angular Momentum Transport via Internal Gravity Waves in Evolving Stars
• Collective pulsational velocity broadening due to gravity modes as a physical explanation for macroturbulence in hot massive stars
• Internal Gravity Wave Excitation by Turbulent Convection
• On the Chemical Mixing Induced by Internal Gravity Waves (IGW)
• Gravity Waves in the Sun
• Theoretical seismology in 3D : nonlinear simulations of internal gravity waves in solar-like stars
• The Observational Signatures of Convectively Excited Internal Gravity Modes in Main Sequence Stars
• The spin rate of pre-collapse stellar cores: wave-driven angular momentum transport in massive stars
• Generation of internal gravity waves by penetrative convection
• K2 photometry and HERMES spectroscopy of the blue supergiant rho Leo: rotational wind modulation and low-frequency waves
• Implications of Rapid Core Rotation in Red Giants for Internal Angular Momentum Transport in Stars
• Kepler sheds new and unprecedented light on the variability of a blue supergiant: gravity waves in the O9.5Iab star HD 188209
• Order Out of Chaos: Slowly Reversing Mean Flows Emerge from Turbulently Generated Internal Waves
• Characterizing the propagation of gravity waves in 3D nonlinear simulations of solar-like stars
• A BRITE view on the massive O-type supergiant V973 Scorpii: Hints towards internal gravity waves or subsurface convection zones

Cited by in corpus (14)

• Probing the interior physics of stars through asteroseismology
• Angular Momentum Transport in Stellar Interiors
• Three-Dimensional Simulations of Massive Stars: I. Wave Generation and Propagation
• Fully compressible simulations of waves and core convection in main-sequence stars
• On the Origin of Stochastic, Low-Frequency Photometric Variability in Massive Stars
• Low-frequency variability in massive stars: Core generation or surface phenomenon?
• Two-Dimensional Simulations of Internal Gravity Waves in The Radiation Zones of Intermediate-Mass Stars
• Chemical Mixing Induced by Internal Gravity Waves in Intermediate Mass Stars
• Two-dimensional simulations of solar-like models with artificially enhanced luminosity. II. Impact on internal gravity waves
• Two-dimensional simulations of internal gravity waves in a 5 $M_{\odot }$ Zero-Age-Main-Sequence model
• Three-Dimensional Simulations of Massive Stars: II. Age Dependence
• Effect of Rotation on Wave Mixing in Intermediate Mass Stars
• Calibrating chemical mixing induced by internal gravity waves based on hydrodynamical simulations; The chemical evolution of OB-type stars
• Resonance locking and tidal evolution in rotating γ-Doradus binaries