Mixed modes in red-giant stars observed with CoRoT

Abstract

The CoRoT mission has provided thousands of red-giant light curves. The analysis of their solar-like oscillations allows us to characterize their stellar properties. Up to now, the global seismic parameters of the pressure modes remain unable to distinguish red-clump giants from members of the red-giant branch. As recently done with Kepler red giants, we intend to analyze and use the so-called mixed modes to determine the evolutionary status of the red giants observed with CoRoT. We also aim at deriving different seismic characteristics depending on evolution. The complete identification of the pressure eigenmodes provided by the red-giant universal oscillation pattern allows us to aim at the mixed modes surrounding the l=1 expected eigenfrequencies. A dedicated method based on the envelope autocorrelation function is proposed to analyze their period separation. We have identified the mixed-mode signature separation thanks to their pattern compatible with the asymptotic law of gravity modes. We have shown that, independent of any modelling, the g-mode spacings help to distinguish the evolutionary status of a red-giant star. We then report different seismic and fundamental properties of the stars, depending on their evolutionary status. In particular, we show that high-mass stars of the secondary clump present very specific seismic properties. We emphasize that stars belonging to the clump were affected by significant mass loss. We also note significant population and/or evolution differences in the different fields observed by CoRoT.

References in corpus (3)

• Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars
• Probing the properties of convective cores through g modes: high-order g modes in SPB and gamma Doradus stars
• HD 46375: seismic and spectropolarimetric analysis of a young Sun hosting a Saturn-like planet

Cited by in corpus (137)

• The PLATO 2.0 Mission
• Asteroseismology of Solar-Type and Red-Giant Stars
• Spin down of the core rotation in red giants
• Testing Scaling Relations for Solar-Like Oscillations from the Main Sequence to Red Giants using Kepler Data
• The Updated BaSTI Stellar Evolution Models and Isochrones: I. Solar Scaled Calculations
• Seismic constraints on the radial dependence of the internal rotation profiles of six Kepler subgiants and young red giants
• Asteroseismology of old open clusters with Kepler: direct estimate of the integrated RGB mass loss in NGC6791 and NGC6819
• The APOKASC Catalog: An Asteroseismic and Spectroscopic Joint Survey of Targets in the Kepler Fields
• Calculating asteroseismic diagrams for solar-like oscillations
• Thermohaline instability and rotation-induced mixing. III - Grid of stellar models and asymptotic asteroseismic quantities from the pre-main sequence up to the AGB for low- and intermediate-mass stars at various metallicities
• Rotation and magnetism of Kepler pulsating solar-like stars. Towards asteroseismically calibrated age-rotation relations
• Probing the core structure and evolution of red giants using gravity-dominated mixed modes observed with Kepler
• Asteroseismic classification of stellar populations among 13000 red giants observed by Kepler
• Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G=18.5
• Characterization of the power excess of solar-like oscillations in red giants with Kepler
• The APOGEE red-clump catalog: Precise distances, velocities, and high-resolution elemental abundances over a large area of the Milky Way's disk
• Mixed modes in red giants: a window on stellar evolution
• Galactic archaeology: mapping and dating stellar populations with asteroseismology of red-giant stars
• Young [$\alpha$/Fe]-enhanced stars discovered by CoRoT and APOGEE: What is their origin?
• Granulation in Red Giants: observations by the Kepler mission and 3D convection simulations
• Bayesian distances and extinctions for giants observed by Kepler and APOGEE
• Age dissection of the Milky Way discs: red giants in the Kepler field
• Period spacings in red giants II. Automated measurement
• Giant star seismology
• Asteroseismology of solar-type stars
• Asteroseismology of the open clusters NGC 6791, NGC 6811, and NGC 6819 from nineteen months of Kepler photometry
• Pulsating red giant stars in eccentric binary systems discovered from Kepler space-based photometry
• Seismic diagnostics for transport of angular momentum in stars 2. Interpreting observed rotational splittings of slowly-rotating red giant stars
• Kepler-91b: a planet at the end of its life. Planet and giant host star properties via light-curve variations
• Evolutionary influences on the structure of red-giant acoustic oscillation spectra from 600d of Kepler observations
• Period spacings in red giants I. Disentangling rotation and revealing core structure discontinuities
• Testing convective-core overshooting using period spacings of dipole modes in red giants
• Galactic Archaeology with asteroseismology and spectroscopy: Red giants observed by CoRoT and APOGEE
• Bayesian peak bagging analysis of 19 low-mass low-luminosity red giants observed with Kepler
• Internal rotation of the red-giant star KIC 4448777 by means of asteroseismic inversion
• Period-luminosity relations in evolved red giants explained by solar-like oscillations
• Red Giants in Eclipsing Binary and Multiple-Star Systems: Modeling and Asteroseismic Analysis of 70 Candidates from Kepler Data
• Interaction Between Convection and Pulsation
• Period spacings in red giants IV: Toward a complete description of the mixed-mode pattern
• 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
• Old puzzle, new insights: a lithium rich giant quietly burning helium in its core
• APOKASC-3: The Third Joint Spectroscopic and Asteroseismic catalog for Evolved Stars in the Kepler Fields
• Theoretical power spectra of mixed modes in low mass red giant stars
• The Gaia-ESO Survey: calibration strategy
• A New Method for the Asteroseismic Determination of the Evolutionary State of Red-Giant Stars
• Study of KIC 8561221 observed by Kepler: an early red giant showing depressed dipolar modes
• Asteroseismic surface gravity for evolved stars
• Acoustic Signatures of the Helium Core Flash
• Inferring mode inertias in evolved solar-like stars
• Angular momentum redistribution by mixed modes in evolved low-mass stars. I. Theoretical formalism
• Period spacings in red giants; III. Coupling factors of mixed modes
• Solar-like oscillations in red giants observed with \textit{Kepler}: influence of increased timespan on global oscillation parameters
• Ages and Masses of 0.64 million Red Giant Branch stars from the LAMOST Galactic Spectroscopic Survey
• Properties of oscillation modes in subgiant stars observed by Kepler
• Survey of Li-rich giants among Kepler and LAMOST fields: Determination of Li-rich giants Evolutionary Phase
• Horizons: Nuclear Astrophysics in the 2020s and Beyond
• A helium-flash-induced mixing event can explain the lithium abundances of red clump stars
• The Physical Parameters of the Retired A Star HD185351
• Near-degeneracy effects on the frequencies of rotationally-split mixed modes in red giants
• Excitation of gravity waves by fingering convection, and the formation of compositional staircases in stellar interiors
• Fundamental properties of five Kepler stars using global asteroseismic quantities and ground-based observations
• Atmospheric parameters and chemical properties of red giants in the CoRoT asteroseismology fields
• Amplitude and lifetime of radial modes in red giant star spectra observed by Kepler
• The Gaia-ESO Survey: properties of newly discovered Li-rich giants
• Differential population studies using asteroseismology: solar-like oscillating giants in CoRoT fields LRc01 and LRa01
• Spectroscopic and seismic analysis of red giants in eclipsing binaries discovered by Kepler
• On the asymptotic acoustic-mode phase in red-giant stars and its dependence on evolutionary state
• RAVE stars in K2 - I. Improving RAVE red giants spectroscopy using asteroseismology from K2 Campaign 1
• Seismic signature of electron degeneracy in the core of red giants: hints for mass transfer between close red-giant companions
• Seismic probing of the first dredge-up event through the eccentric red-giant & red-giant spectroscopic binary KIC9163796
• Pulsations of rapidly rotating stars: II. Realistic modelling for intermediate-mass 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
• The masses of retired A stars with asteroseismology: Kepler and K2 observations of exoplanet hosts
• Testing the asymptotic relation for period spacings from mixed modes of red giants observed with the Kepler mission
• Modelling a high-mass red giant observed by CoRoT
• Asteroseismology of red giants as a tool for studying stellar populations: first steps
• Photospheric diagnostics of core helium burning in giant stars
• Asteroseismic Fingerprints of Stellar Mergers
• How accurate are stellar ages based on stellar models? II. The impact of asteroseismology
• Stellar oscillations. II The non-adiabatic case
• Stellar model fits and inversions
• Seismic performance
• Coefficients of variation for detecting solar-like oscillations
• Probing the mid-layer structure of red giants I. Mixed-mode coupling factor as a seismic diagnosis
• Verification of Asymptotic Relation for Mixed Modes in Red Giant Stars
• Convective-core overshoot and suppression of oscillations: Constraints from red giants in NGC6811
• Detection of solar-like oscillations in the bright red giant stars $\gamma$ Psc and ${\theta }^1$ Tau from a 190-day high-precision spectroscopic multisite campaign
• Core-Envelope Coupling in Intermediate-Mass Core-Helium Burning Stars
• Overshooting calibration and age determination from evolved binary system
• Magnetic signatures on mixed-mode frequencies. II. Period spacings as a probe of the internal magnetism of red giants
• Attempts to reproduce the rotation profile of the red giant KIC 7341231 observed by Kepler
• Variations of the mixing character of dipolar mixed modes in red giant stars
• Deciphering stellar chorus: apollinaire, a Python 3 module for Bayesian peakbagging in helio- and asteroseismology
• A new method for extracting seismic indices and granulation parameters: results for more than 20,000 CoRoT and Kepler red giants
• CoRoT and Kepler results: Solar-like oscillators
• Identification, mass and age of primary red clump stars from spectral features derived with the LAMOST DR7
• Dipolar modes in luminous red giants
• Precise Masses, Ages of ~1.0 million RGB and RC stars observed by the LAMOST
• Clumpiness: Time-domain classification of red-giant evolutionary states
• Grid-based seismic modelling at high and low signal-to-noise ratios HD 181420 and HD 175272
• From the Inner to Outer Milky Way: A Photometric Sample of 2.6 Million Red Clump Stars
• Asteroseismic analysis of solar-mass subgiants KIC 6442183 and KIC 11137075 observed by Kepler
• The CoRoT-GES Collaboration. Improving Red Giants spectroscopic surface gravity and abundances with asteroseismology
• Unveiling the Structure and Dynamics of Red Giants with Asteroseismology
• Asteroseismic sensitivity to internal rotation along the red-giant branch
• Multi-campaign Asteroseismic Analysis of eight Solar-like pulsating stars observed by the K2 mission
• Constraining the core-rotation rate in red-giant stars from Kepler space photometry
• Asteroseismology of red giant stars: the potential of dipole modes
• Asteroseismic age determination for dwarfs and giants
• Nonlinear Mixed Modes in Red Giants
• Adiabatic solar-like oscillations in red giant stars
• Frequency identification and asteroseismic analysis of the red giant KIC 9145955: fundamental parameters and helium core size
• Red giants evolutionary status determination: the complete Kepler catalog
• Evolution of Dipolar Mixed-mode Coupling Factor in Red Giant Stars: Impact of Buoyancy Spike
• Seismic characterization of red giants going through the Helium-core flash
• No swan song for Sun-as-a-star helioseismology: performances of the Solar-SONG prototype for individual mode characterisation
• Improved asteroseismic inversions for red-giant surface rotation rates
• Solar-like oscillating stars as standard clocks and rulers for Galactic studies
• Sounding stellar cores with mixed modes
• Observational techniques to measure solar and stellar oscillations
• Oscillations of red giant stars with magnetic damping in the core. I. Dissipation of mode energy in dipole-like magnetic fields
• Asteroseismology of the heartbeat star KIC 5006817
• Mixed-mode coupling in the Red Clump I. Standard single star models
• The efficiency of mixed modes for angular momentum transport
• Asteroseismogyrometry of low-mass red giants I. The SOLA inversion method
• Red giant seismology: observations
• Constraining stellar physics from red-giant stars in binaries - stellar rotation, mixing processes and stellar activity
• Stellar oscillations - the adiabatic case
• Realising efficient computation of individual frequencies for red-giant models
• Red giant asteroseismic binaries in the Kepler field
• Asymptotic power spectra and visibilities of damped mixed modes
• The γ Dor stars as revealed by Kepler : A key to reveal deep-layer rotation in A and F stars
• Asteroseismology of iota Draconis and Discovery of an Additional Long-Period Companion
• Damping of Oscillations in Red Giants by Resonant Mode Coupling
• Peak Bagging of red giant stars observed by Kepler: first results with a new method based on Bayesian nested sampling