In search of gravity mode signatures in main sequence solar-type stars observed by Kepler

Abstract

Gravity modes (g modes), mixed gravito-acoustic modes (mixed modes), and gravito-inertial modes (gi modes) possess unmatched properties as probes for stars with radiative interiors. The structural and dynamical constraints that they are able to provide cannot be accessed by other means. While they provide precious insights into the internal dynamics of evolved stars as well as massive and intermediate-mass stars, their non-detection in main sequence (MS) solar-type stars make them a crucial missing piece in our understanding of angular momentum transport in radiative zones and stellar rotational evolution. In this work, we aim to apply certain analysis tools originally developed for helioseismology in order to look for g-mode signatures in MS solar-type stars. We select a sample of the 34 most promising MS solar-type stars with Kepler four-year long photometric time series. All these stars are well-characterised late F-type stars with thin convective envelopes, fast convective flows, and stochastically excited acoustic modes (p modes). For each star, we compute the background noise level of the Fourier power spectrum to identify significant peaks at low frequency. After successfully detecting individual peaks in 12 targets, we further analyse four of them and observe distinct patterns of surrounding peaks with a low probability of being noise artifacts. Comparisons with the predictions from reference models suggest that these patterns are compatible with the presence of non-asymptotic low-order pure g modes, pure p modes, and mixed modes. Given their sensitivity to both the convective core interface stratification and the coupling between p- and g-mode resonant cavities, such modes are able to provide strong constraints on the structure and evolutionary states of the related targets. [abridged]

arXiv comment19 pages, 19 figures, accepted for publication in A&A

References in corpus (120)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• emcee: The MCMC Hammer
• The Gaia mission
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Modules for Experiments in Stellar Astrophysics (MESA)
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• The PLATO 2.0 Mission
• Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars
• GYRE: An open-source stellar oscillation code based on a new Magnus Multiple Shooting Scheme
• Fast core rotation in red-giant stars revealed by gravity-dominated mixed modes
• Spin down of the core rotation in red giants
• Seismic constraints on the radial dependence of the internal rotation profiles of six Kepler subgiants and young red giants
• Correcting stellar oscillation frequencies for near-surface effects
• Probing the interior physics of stars through asteroseismology
• Fundamental Properties of Kepler Planet-Candidate Host Stars using Asteroseismology
• Ensemble Asteroseismology of Solar-Type Stars with the NASA Kepler Mission
• Standing on the shoulders of Dwarfs: the Kepler asteroseismic LEGACY sample II - radii, masses, and ages
• Revised Stellar Properties of Kepler Targets for the Q1-17 (DR25) Transit Detection Run
• The Mass-Dependence of Angular Momentum Evolution in Sun-Like Stars
• Angular Momentum Transport in Stellar Interiors
• Preparation of Kepler lightcurves for asteroseismic analyses
• The connection between stellar granulation and oscillation as seen by the Kepler mission
• Stellar Limb-Darkening Coefficients for CoRot and Kepler
• Internal Gravity Waves in Massive Stars: Angular Momentum Transport
• Standing on the shoulders of Dwarfs: the $Kepler$ asteroseismic LEGACY sample I - oscillation mode parameters
• CoRoT reveals a magnetic activity cycle in a Sun-like star
• Gamma Doradus Stars: Defining a New Class of Pulsating Variables
• Determining global parameters of the oscillations of solar-like stars
• HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field
• Fast Star, Slow Star; Old Star, Young Star: Subgiant Rotation as a Population and Stellar Physics Diagnostic
• The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
• Angular momentum transport by heat-driven g-modes in slowly pulsating B stars
• Granulation in Red Giants: observations by the Kepler mission and 3D convection simulations
• Asteroseismology of solar-type stars
• Seismic evidence for a weak radial differential rotation in intermediate-mass core helium burning stars
• General Cosmography Model with Spatial Curvature
• Magnetic activity of F stars observed by Kepler
• Internal mixing of rotating stars inferred from dipole gravity modes
• Core rotation braking on the red giant branch for various mass ranges
• On differential rotation and overshooting in solar-like stars
• Oscillation frequencies for 35 \Kepler solar-type planet-hosting stars using Bayesian techniques and machine learning
• First grids of low-mass stellar models and isochrones with self-consistent treatment of rotation : From 0.2 to 1.5 M_\odot at 7 metallicities from PMS to TAMS
• Predicting the detectability of oscillations in solar-type stars observed by Kepler
• Photometric Variability in Kepler Target Stars: The Sun Among Stars -- A First Look
• Surface rotation and photometric activity for Kepler targets. II. G and F main-sequence stars, and cool subgiant stars
• Surface rotation and photometric activity for Kepler targets I. M and K main-sequence stars
• Heartbeat Stars, Tidally Excited Oscillations, and Resonance Locking
• A new asteroseismic diagnostic for internal rotation in $\gamma$ Doradus stars
• Impact on asteroseismic analyses of regular gaps in Kepler data
• Global-scale equatorial Rossby waves as an essential component of solar internal dynamics
• Theory and evidence of global Rossby waves in upper main-sequence stars: r-mode oscillations in many Kepler stars
• Measuring the extent of convective cores in low-mass stars using Kepler data: towards a calibration of core overshooting
• On the sensitivity of gravito-inertial modes to differential rotation in intermediate-mass main-sequence stars
• Characterising stellar micro-variability for planetary transit searches
• Turbulent convection and pulsation stability of stars - II. Theoretical instability strip for $\delta$ Scuti and $\gamma$ Doradus stars
• Rotation speed and stellar axis inclination from p modes: How CoRoT would see other suns
• Nearly-uniform internal rotation of solar-like main-sequence stars revealed by space-based asteroseismology and spectroscopic measurements
• On the competing effect of wind braking and interior coupling in the rotational evolution of solar-like stars
• Asymptotic g modes: Evidence for a rapid rotation of the solar core
• Gaia DR3 astrometric orbit determination with Markov Chain Monte Carlo and Genetic Algorithms. Systems with stellar, substellar, and planetary mass companions
• Gap interpolation by inpainting methods : Application to Ground and Space-based Asteroseismic data
• Asteroseismic detection of latitudinal differential rotation in 13 Sun-like stars
• γ Doradus stars as test of angular momentum transport models
• What asteroseismology can do for exoplanets: Kepler-410A b is a Small Neptune around a bright star, in an eccentric orbit consistent with low obliquity
• Asteroseismic masses, ages, and core properties of $\gamma$ Doradus stars using gravito-inertial dipole modes and spectroscopy
• The astrophysics of visible-light orbital phase curves in the space age
• Weakened magnetic braking supported by asteroseismic rotation rates of Kepler dwarfs
• Stochastic excitation of nonradial modes II. Are solar asymptotic gravity modes detectable?
• Constraining mixing processes in stellar cores using asteroseismology. Impact of semiconvection in low-mass stars
• Detecting non-uniform period spacings in the Kepler photometry of gamma Doradus stars: methodology and case studies
• Structural glitches near the cores of red giants revealed by oscillations in g-mode period spacings from stellar models
• 30 to 100-kG magnetic fields in the cores of red giant stars
• Gravity modes in rapidly rotating stars. Limits of perturbative methods
• Theoretical seismology in 3D : nonlinear simulations of internal gravity waves in solar-like stars
• Characterizing solar-type stars from full-length Kepler data sets using the Asteroseismic Modeling Portal
• The Contour Method: a new approach to finding modes of non-adiabatic stellar pulsations
• Solar inertial modes: Observations, identification, and diagnostic promise
• On the surface physics affecting solar oscillation frequencies
• Deciphering the oscillation spectrum of $\gamma$ Doradus and SPB stars
• Constraining stellar evolution theory with asteroseismology of $\gamma$ Doradus stars using deep learning
• Strong magnetic fields detected in the cores of 11 red giant stars using gravity-mode period spacings
• Generation of internal gravity waves by penetrative convection
• Magnetic signatures on mixed-mode frequencies. I. An axisymmetric fossil field inside the core of red giants
• On deriving p-mode parameters for inclined solar-like stars
• Revisiting the impact of stellar magnetic activity on the detectability of solar-like oscillations by Kepler
• Impact of rotation on stochastic excitation of gravity and gravito-inertial waves in stars
• Surface-effect corrections for oscillation frequencies of evolved stars
• Extreme value statistics for two-dimensional convective penetration in a pre-Main Sequence star
• Super-Nyquist asteroseismology of solar-like oscillators with Kepler and K2 - expanding the asteroseismic cohort at the base of the red-giant branch
• Photospheric activity of the Sun with VIRGO and GOLF: Comparison with standard activity proxies
• Semi-analytic Expressions for the Isolation and Coupling of Mixed Modes
• Characterizing the propagation of gravity waves in 3D nonlinear simulations of solar-like stars
• Starspot signature on the light curve: Learning about the latitudinal distribution of spots
• A study of convective core overshooting as a function of stellar mass based on two-dimensional hydrodynamical simulations
• Detections of solar-like oscillations in dwarfs and subgiants with Kepler DR25 short-cadence data
• Asteroseismic modeling of gravity modes in slowly rotating A/F stars with radiative levitation
• Effect of a strong magnetic field on gravity-mode period spacings in red giant stars
• Solar-like oscillations in massive main-sequence stars. I. Asteroseismic signatures of the driving and damping regions
• Chemical Mixing Induced by Internal Gravity Waves in Intermediate Mass Stars
• Asteroseismology of 19 low-luminosity red giant stars from Kepler
• A homogeneous spectroscopic analysis of a Kepler legacy sample of dwarfs for gravity-mode asteroseismology
• A model of rotating convection in stellar and planetary interiors: II -- gravito-inertial wave generation
• Rossby numbers and stiffness values inferred from gravity-mode asteroseismology of rotating F- and B-type dwarfs: consequences for mixing, transport, magnetism, and convective penetration
• Deciphering stellar chorus: apollinaire, a Python 3 module for Bayesian peakbagging in helio- and asteroseismology
• Evidence of structural discontinuities in the inner core of red-giant stars
• Influence of magnetic activity on the determination of stellar parameters through asteroseismology
• Testing angular momentum transport processes with asteroseismology of solar-type main-sequence stars
• Two-dimensional simulations of solar-like models with artificially enhanced luminosity. II. Impact on internal gravity waves
• Asteroseismic Inference of the Central Structure in a Subgiant Star
• Hunting for anti-solar differentially rotating stars using the Rossby number -- An application to the Kepler field
• Stochastic excitation of internal gravity waves in rotating late F-type stars: A 3D simulation approach
• Multi-campaign Asteroseismic Analysis of eight Solar-like pulsating stars observed by the K2 mission
• Constraints on the core mu-gradient of the solar-like star HD 49385 via low-degree mixed modes
• Glitches in solar-like oscillating F-type stars: Theoretical signature of the base of the convective envelope on the ratios $r_{010}$
• Amplitudes of Solar Gravity Modes: A Review
• Projected spin-orbit alignments from Kepler asteroseismology and Gaia astrometry

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