Spectrum and amplitudes of internal gravity waves excited by penetrative convection in solar-type stars

Abstract

The excitation of internal gravity waves by penetrative convective plumes is investigated using 2-D direct simulations of compressible convection. The wave generation is quantitatively studied from the linear response of the radiative zone to the plumes penetration, using projections onto the g-modes solutions of the associated linear eigenvalue problem for the perturbations. This allows an accurate determination of both the spectrum and amplitudes of the stochastically excited modes. Using time-frequency diagrams of the mode amplitudes, we then show that the lifetime of a mode is around twice its period and that during times of significant excitation up to 40% of the total kinetic energy may be contained into g-modes.

13 pages, 19 figures, accepted for publication in A&A

References in corpus (6)

• Angular momentum extraction by gravity waves in the Sun
• Angular momentum redistribution by waves in the Sun
• Angular momentum transport by gravity waves and its effect on the rotation of the solar interior
• Identification of gravity waves in hydrodynamical simulations
• A comparison of the anelastic and subseismic approximations for low-frequency gravity modes in stars
• More concerning the anelastic and subseismic approximations for low-frequency modes in stars

Cited by in corpus (33)

• Influence of gravity waves on the internal rotation and Li abundance of solar-type stars
• Probing the interior physics of stars through asteroseismology
• The role of convection, overshoot, and gravity waves for the transport of dust in M dwarf and brown dwarf atmospheres
• Internal Gravity Wave Excitation by Turbulent Convection
• The quest for the solar g modes
• Stochastic excitation of nonradial modes II. Are solar asymptotic gravity modes detectable?
• Astrophysical turbulence modeling
• Theoretical seismology in 3D : nonlinear simulations of internal gravity waves in solar-like stars
• Hydrodynamic simulations of He-shell flash convection
• Can plume-induced internal gravity waves regulate the core rotation of subgiant stars?
• Stochastic excitation of non-radial modes I. High-angular-degree p modes
• Generation of internal gravity waves by penetrative convection
• Transport processes in stars: diffusion, rotation, magnetic fields and internal waves
• Characterizing the propagation of gravity waves in 3D nonlinear simulations of solar-like stars
• Penetrative Convection at High Rayleigh Numbers
• The coupling between internal waves and shear-induced turbulence in stellar radiation zones: the critical layer
• 3D hydrodynamic simulations of massive main-sequence stars. I. Dynamics and mixing of convection and internal gravity waves
• Penetrative turbulent Rayleigh-Bénard convection in two and three dimensions
• Perspectives in Global Helioseismology, and the Road Ahead
• A model of rotating convection in stellar and planetary interiors: II -- gravito-inertial wave generation
• 3D hydrodynamics simulations of internal gravity waves in red giant branch stars
• Direct numerical simulations of the kappa-mechanism II. The nonlinear saturation and Hertzsprung's progression
• Deep inside low-mass stars
• Mode conversion of radiatively damped magnetogravity waves in the solar chromosphere
• Convective quenching of stellar pulsations
• Solar Gravity Modes: Present and Future
• Data assimilation for stratified convection
• Amplitude of solar gravity modes generated by penetrative plumes
• Impact of radial truncation on global 2D hydrodynamic simulations for a Sun-like model
• Amplitudes of Solar Gravity Modes: A Review
• A test of time-dependent theories of stellar convection
• Detection of Gravity Modes in RR Lyrae Stars
• Universal properties of penetrative turbulent Rayleigh--Bénard convection in cold water near $4^{\circ }\mathrm{C}$