Excitation of solar-like oscillations across the HR diagram

Abstract

We extend semi-analytical computations of excitation rates for solar oscillation modes to those of other solar-like oscillating stars to compare them with recent observations. Numerical 3D simulations of surface convective zones of several solar-type oscillating stars are used to characterize the turbulent spectra as well as to constrain the convective velocities and turbulent entropy fluctuations in the uppermost part of the convective zone of such stars. These constraints, coupled with a theoretical model for stochastic excitation, provide the rate 'P' at which energy is injected into the p-modes by turbulent convection. These energy rates are compared with those derived directly from the 3D simulations. The excitation rates obtained from the 3D simulations are systematically lower than those computed from the semi-analytical excitation model. We find that Pmax, the excitation rate maximum, scales as (L/M)^s where s is the slope of the power law and L and M are the mass and luminosity of the 1D stellar model built consistently with the associated 3D simulation. The slope is found to depend significantly on the adopted form of the eddy time-correlation ; using a Lorentzian form results in s=2.6, whereas a Gaussian one gives s=3.1. Finally, values of Vmax, the maximum in the mode velocity, are estimated from the computed power laws for Pmax and we find that Vmax increases as (L/M)^sv. Comparisons with the currently available ground-based observations show that the computations assuming a Lorentzian eddy time-correlation yield a slope, sv, closer to the observed one than the slope obtained when assuming a Gaussian. We show that the spatial resolution of the 3D simulations must be high enough to obtain accurate computed energy rates.

14 pages ; 7 figures ; accepted for publication in Astrophysics & Astronomy

References in corpus (2)

• A closure model with plumes I. The solar convection
• A closure model with plumes II. Application to the stochastic excitation of stellar p modes

Cited by in corpus (36)

• The connection between stellar granulation and oscillation as seen by the Kepler mission
• Standing on the shoulders of Dwarfs: the $Kepler$ asteroseismic LEGACY sample I - oscillation mode parameters
• Improvements to stellar structure models, based on a grid of 3D convection simulations. II. Calibrating the mixing-length formulation
• Asteroseismology of solar-type stars
• Global Seismology of the Sun
• The amplitude of solar oscillations using stellar techniques
• Intrinsic photometric characterisation of stellar oscillations and granulation. Solar reference values and CoRoT response functions
• Accurate p-mode measurements of the G0V metal-rich CoRoT target HD 52265
• Magnetic Activity Cycles in the Exoplanet Host Star epsilon Eridani
• Solar-like oscillations with low amplitude in the CoRoT target HD 181906
• Solar-like oscillations in the G8 V star tau Ceti
• Damping rates of solar-like oscillations across the HR diagram. Theoretical calculations confronted to CoRoT and Kepler observations
• Asteroseismology of 36 \emph{Kepler} subgiants -- I. Oscillation frequencies, linewidths and amplitudes
• Mode width fitting with a simple bayesian approach. Application to CoRoT targets HD 181420 and HD 49933
• Activity time series of old stars from late F to early K. I. Simulating radial velocity, astrometry, photometry, and chromospheric emission
• Photometric Oscillations of Low Luminosity Red Giant Stars
• HD 203608, a quiet asteroseismic target in the old galactic disk
• Modelling the excitation of acoustic modes in Alpha Cen A
• HD 46375: seismic and spectropolarimetric analysis of a young Sun hosting a Saturn-like planet
• Perspectives in Global Helioseismology, and the Road Ahead
• Asteroseismology of red giants: photometric observations of Arcturus by SMEI
• The effects of granulation and supergranulation on Earth-mass planet detectability in the habitable zone around F6-K4 stars
• Solar $p$-mode damping rates: insight from a 3D hydrodynamical simulation
• Convective Excitation and Damping of Solar-like Oscillations
• Expanding the frontiers of cool-dwarf asteroseismology with ESPRESSO. Detection of solar-like oscillations in the K5 dwarf $\epsilon$ Indi
• The amplitude of solar p-mode oscillations from three-dimensional convection simulations
• A search for solar-like oscillations in K giants in the globular cluster M4
• On the computation of eigenfrequencies for equilibrium models including turbulent pressure
• Interaction of solar inertial modes with turbulent convection. A 2D model for the excitation of linearly stable modes
• A Distant Mirror: Solar Oscillations Observed on Neptune by the Kepler K2 Mission
• Hydrodynamical model atmospheres: Their impact on stellar spectroscopy and asteroseismology of late-type stars
• Quadrupole stellar oscillations: The impact of gravitational waves from the Galactic Center
• They Do Change After All: 25 Years of GONG Data Reveal Variation of p-Mode Energy Supply Rates
• Observations of Locally Excited Waves in the Low Solar Atmosphere Using the Daniel K. Inouye Solar Telescope (DKIST)
• Analysing solar-like oscillations with an automatic pipeline
• Damping of Oscillations in Red Giants by Resonant Mode Coupling