Theoretical power spectra of mixed modes in low mass red giant stars

Abstract

CoRoT and Kepler observations of red giant stars revealed very rich spectra of non-radial solar-like oscillations. Of particular interest was the detection of mixed modes that exhibit significant amplitude, both in the core and at the surface of the stars. It opens the possibility of probing the internal structure from their inner-most layers up to their surface along their evolution on the red giant branch as well as on the red-clump. Our objective is primarily to provide physical insight into the physical mechanism responsible for mixed-modes amplitudes and lifetimes. Subsequently, we aim at understanding the evolution and structure of red giants spectra along with their evolution. The study of energetic aspects of these oscillations is also of great importance to predict the mode parameters in the power spectrum. Non-adiabatic computations, including a time-dependent treatment of convection, are performed and provide the lifetimes of radial and non-radial mixed modes. We then combine these mode lifetimes and inertias with a stochastic excitation model that gives us their heights in the power spectra. For stars representative of CoRoT and Kepler observations, we show under which circumstances mixed modes have heights comparable to radial ones. We stress the importance of the radiative damping in the determination of the height of mixed modes. Finally, we derive an estimate for the height ratio between a g-type and a p-type mode. This can thus be used as a first estimate of the detectability of mixed-modes.

References in corpus (41)

• Fast core rotation in red-giant stars revealed by gravity-dominated mixed modes
• Updated Electron-Conduction Opacities: The Impact on Low-Mass Stellar Models
• Spin down of the core rotation in red giants
• Seismic evidence for a rapidly rotating core in a lower-giant-branch star observed with Kepler
• Seismic constraints on the radial dependence of the internal rotation profiles of six Kepler subgiants and young red giants
• Seismic diagnostics for transport of angular momentum in stars 1. Rotational splittings from the PMS to the RGB
• Initial Characteristics of Kepler Short Cadence Data
• Characterization of the power excess of solar-like oscillations in red giants with Kepler
• Red-giant seismic properties analyzed with CoRoT
• The underlying physical meaning of the ${\nu }_{\max }-{\nu }_{\mathrm{c}}$ relation
• Theoretical amplitudes and lifetimes of non-radial solar-like oscillations in red giants
• Galactic archaeology: mapping and dating stellar populations with asteroseismology of red-giant stars
• Angular momentum transport in stellar interiors constrained by rotational splittings of mixed modes in red giants
• Asteroseismology of red giants from the first four months of Kepler data: Global oscillation parameters for 800 stars
• Mixed modes in red-giant stars observed with CoRoT
• Asteroseismology of the open clusters NGC 6791, NGC 6811, and NGC 6819 from nineteen months of Kepler photometry
• Oscillations of alpha UMa and other red giants
• Excitation of stellar p-modes by turbulent convection: 1. Theoretical formulation
• Probing populations of red giants in the galactic disk with CoRoT
• Seismic diagnostics for transport of angular momentum in stars 2. Interpreting observed rotational splittings of slowly-rotating red giant stars
• Intrinsic photometric characterisation of stellar oscillations and granulation. Solar reference values and CoRoT response functions
• Period-luminosity relations in evolved red giants explained by solar-like oscillations
• A Bayesian approach to scaling relations for amplitudes of solar-like oscillations in Kepler stars
• Frequency, splitting, linewidth and amplitude estimates of low-l p modes of alpha Cen A: analysis of WIRE photometry
• Amplitudes and lifetimes of solar-like oscillations observed by CoRoT* Red-giant versus main-sequence stars
• Mode lifetimes of stellar oscillations - Implications for asteroseismology
• Numerical constraints on the model of stochastic excitation of solar-type oscillations
• Oscillation mode linewidths of main-sequence and subgiant stars observed by Kepler
• Inferring mode inertias in evolved solar-like stars
• Oscillation mode linewidths and heights of 23 main-sequence stars observed by Kepler
• Properties of oscillation modes in subgiant stars observed by Kepler
• Damping rates of solar-like oscillations across the HR diagram. Theoretical calculations confronted to CoRoT and Kepler observations
• Can mass loss and overshooting prevent the excitation of g-modes in blue supergiants?
• A closure model with plumes I. The solar convection
• Oscillation mode lifetimes of red giants observed during the initial and first anticentre long run of CoRoT
• Non-perturbative effect of rotation on dipolar mixed modes in red giant stars
• Dipolar modes in luminous red giants
• Turbulent eddy-time-correlation in the solar convective zone
• Excitation and damping of p-mode oscillations of alpha Cen B
• Inference from adiabatic analysis of solar-like oscillations in Red giants
• Pulsations of rapidly rotating stars with compositional discontinuities

Cited by in corpus (55)

• Probing the interior physics of stars through asteroseismology
• Mixed modes in red giants: a window on stellar evolution
• Period spacings in red giants II. Automated measurement
• Asteroseismology Can Reveal Strong Internal Magnetic Fields in Red Giant Stars
• Giant star seismology
• Core rotation braking on the red giant branch for various mass ranges
• Bayesian peak bagging analysis of 19 low-mass low-luminosity red giants observed with Kepler
• Structural glitches near the cores of red giants revealed by oscillations in g-mode period spacings from stellar models
• Asteroseismic signatures of evolving internal stellar magnetic fields
• Deep Learning Classification in Asteroseismology
• Dipole modes with depressed amplitudes in red giants are mixed modes
• Angular momentum redistribution by mixed modes in evolved low-mass stars. II. Spin-down of the core of red giants induced by mixed modes
• Period spacings in red giants IV: Toward a complete description of the mixed-mode pattern
• APOKASC-3: The Third Joint Spectroscopic and Asteroseismic catalog for Evolved Stars in the Kepler Fields
• Deep Learning Classification in Asteroseismology Using an Improved Neural Network: Results on 15000 Kepler Red Giants and Applications to K2 and TESS Data
• A New Method for the Asteroseismic Determination of the Evolutionary State of Red-Giant Stars
• Period spacings in red giants; III. Coupling factors of mixed modes
• Active red giants: close binaries versus single rapid rotators
• Near-degeneracy effects on the frequencies of rotationally-split mixed modes in red giants
• Mean density inversions for red giants and red clump stars
• Insights from the APOKASC Determination of the Evolutionary State of Red-Giant Stars by consolidation of different methods
• Models of red giants in the CoRoT asteroseismology fields combining asteroseismic and spectroscopic constraints
• A variational encoder-decoder approach to precise spectroscopic age estimation for large Galactic surveys
• Testing the asymptotic relation for period spacings from mixed modes of red giants observed with the Kepler mission
• Investigating surface correction relations for RGB stars
• Asteroseismic measurement of core and envelope rotation rates for 2006 red giant branch stars
• The PLATO Solar-like Light-curve Simulator: A tool to generate realistic stellar light-curves with instrumental effects representative of the PLATO mission
• Probing the mid-layer structure of red giants I. Mixed-mode coupling factor as a seismic diagnosis
• Testing the cores of first ascent red-giant stars using the period spacing of g modes
• Solar $p$-mode damping rates: insight from a 3D hydrodynamical simulation
• Asteroseismic Inference of Subgiant Evolutionary Parameters with Deep Learning
• A new method for extracting seismic indices and granulation parameters: results for more than 20,000 CoRoT and Kepler red giants
• Evolution of the gravity offset of mixed modes in RGB stars
• Asteroseismology of evolved stars to constrain the internal transport of angular momentum. VI. Testing a parametric formulation for the azimuthal magneto-rotational instability
• On the computation of eigenfrequencies for equilibrium models including turbulent pressure
• Seismic constraints on the internal structure of evolved stars: From high-luminosity RGB to AGB stars
• Nonlinear Mixed Modes in Red Giants
• Revisiting the Red-giant Branch Hosts KOI-3886 and $\iota$ Draconis. Detailed Asteroseismic Modeling and Consolidated Stellar Parameters
• On asymmetric dark matter constraints from the asteroseismology of a subgiant star
• Red giants evolutionary status determination: the complete Kepler catalog
• Vetting Asteroseismic $\Delta \nu$ Measurements using Neural Networks
• Seismic characterization of red giants going through the Helium-core flash
• Amplitudes of Solar Gravity Modes: A Review
• Modelling linewidths of Kepler red giants in NGC 6819
• Oscillations of red giant stars with magnetic damping in the core. I. Dissipation of mode energy in dipole-like magnetic fields
• Pushing the boundaries of asteroseismic individual frequency modelling: unveiling two evolved very-low metallicity red giants
• Parametric models of core-helium-burning stars: structural glitches near the core
• The efficiency of mixed modes for angular momentum transport
• Realising efficient computation of individual frequencies for red-giant models
• Stellar oscillations - the adiabatic case
• Seismic and spectroscopic analysis of 9 bright red giants observed by Kepler
• Asymptotic power spectra and visibilities of damped mixed modes
• Near-degeneracy effects in Quadrupolar Mixed Modes. From an Asymptotic Description to Data Fitting
• Detailed theoretical analysis of core Helium-burning stars: Mixed mode patterns I. Impact of the He-flash discontinuity and of induced semi-convection
• Damping of Oscillations in Red Giants by Resonant Mode Coupling