Signatures of magnetic activity in the seismic data of solar-type stars observed by Kepler

Abstract

In the Sun, the frequencies of the acoustic modes are observed to vary in phase with the magnetic activity level. These frequency variations are expected to be common in solar-type stars and contain information about the activity-related changes that take place in their interiors. The unprecedented duration of Kepler photometric time-series provides a unique opportunity to detect and characterize stellar magnetic cycles through asteroseismology. In this work, we analyze a sample of 87 solar-type stars, measuring their temporal frequency shifts over segments of length 90 days. For each segment, the individual frequencies are obtained through a Bayesian peak-bagging tool. The mean frequency shifts are then computed and compared with: 1) those obtained from a cross-correlation method; 2) the variation in the mode heights; 3) a photometric activity proxy; and 4) the characteristic timescale of the granulation. For each star and 90-d sub-series, we provide mean frequency shifts, mode heights, and characteristic timescales of the granulation. Interestingly, more than 60% of the stars show evidence for (quasi-)periodic variations in the frequency shifts. In the majority of the cases, these variations are accompanied by variations in other activity proxies. About 20% of the stars show mode frequencies and heights varying approximately in phase, in opposition to what is observed for the Sun.

arXiv commentAccepted for publication in ApJS, 19(+86) pages, 11(+89) figures, 2(+87) tables

References in corpus (68)

• emcee: The MCMC Hammer
• Modules for Experiments in Stellar Astrophysics (MESA)
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Parallel Tempering: Theory, Applications, and New Perspectives
• Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
• Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
• Rotation Periods of 34,030 Kepler Main-Sequence Stars: The Full Autocorrelation Sample
• Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology
• Testing Scaling Relations for Solar-Like Oscillations from the Main Sequence to Red Giants using Kepler Data
• Asteroseismic fundamental properties of solar-type stars observed by the NASA Kepler Mission
• The APOKASC Catalog: An Asteroseismic and Spectroscopic Joint Survey of Targets in the Kepler Fields
• Fundamental Properties of Kepler Planet-Candidate Host Stars using Asteroseismology
• Standing on the shoulders of Dwarfs: the Kepler asteroseismic LEGACY sample II - radii, masses, and ages
• Preparation of Kepler lightcurves for asteroseismic analyses
• The connection between stellar granulation and oscillation as seen by the Kepler mission
• A Revised Effective Temperature Scale for the Kepler Input Catalog
• Rotation and magnetism of Kepler pulsating solar-like stars. Towards asteroseismically calibrated age-rotation relations
• 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
• Stellar Rotation Periods of the Kepler Objects of Interest: A Dearth of Close-in Planets around Fast Rotators
• Granulation in Red Giants: observations by the Kepler mission and 3D convection simulations
• Rotation Periods, Variability Properties and Ages for Kepler Exoplanet Candidate Host Stars
• Multiple and changing cycles of active stars II. Results
• The Kepler-10 planetary system revisited by HARPS-N: A hot rocky world and a solid Neptune-mass planet
• Magnetic activity of F stars observed by Kepler
• Oscillation frequencies for 35 \Kepler solar-type planet-hosting stars using Bayesian techniques and machine learning
• Predicting the detectability of oscillations in solar-type stars observed by Kepler
• Amplitudes of solar-like oscillations: a new scaling relation
• A seismic signature of a second dynamo?
• Discovery of a 1.6-year Magnetic Activity Cycle in the Exoplanet Host Star iota Horologii
• Bayesian peak-bagging of solar-like oscillators using MCMC: A comprehensive guide
• Stroemgren survey for Asteroseismology and Galactic Archaeology: let the SAGA begin
• Automated preparation of Kepler time series of planet hosts for asteroseismic analysis
• Asteroseismic inference on rotation, gyrochronology and planetary system dynamics of 16 Cygni
• Magnetic Activity Cycles in the Exoplanet Host Star epsilon Eridani
• Definitive Sun-as-a-star p-mode frequencies: 23 years of BiSON observations
• Rotation periods and seismic ages of KOIs - comparison with stars without detected planets from Kepler observations
• The art of fitting p-mode spectra: Part I. Maximum Likelihood Estimation
• Solar-like oscillations with low amplitude in the CoRoT target HD 181906
• The influence of metallicity on stellar differential rotation and magnetic activity
• Spin-orbit alignment of exoplanet systems: ensemble analysis using asteroseismology
• Evidence for granulation in early A-type stars
• Asteroseismology from multi-month Kepler photometry: the evolved Sun-like stars KIC 10273246 and KIC 10920273
• The onset of solar cycle 24: What global acoustic modes are telling us
• The quasi-biennial periodicity as a window on the solar magnetic dynamo configuration
• Photospheric and chromospheric magnetic activity of seismic solar analogs. Observational inputs on the solar/stellar connection from Kepler and Hermes
• Asteroseismic inference on the spin-orbit misalignment and stellar parameters of HAT-P-7
• Stellar magnetic activity and variability of oscillation parameters - An investigation of 24 solar-like stars observed by Kepler
• Seismic sensitivity to sub-surface solar activity from 18 years of GOLF/SoHO observations
• Sounding stellar cycles with Kepler - II. Ground-based observations
• Quasi-Biennial variations in helioseismic frequencies: Can the source of the variation be localized?
• Solar Activity Phases and Intermediate-degree Mode Frequencies
• Magnetic variability in the young solar analog KIC 10644253: Observations from the Kepler satellite and the HERMES spectrograph
• Observations of intensity fluctuations attributed to granulation and faculae on Sun-like stars from the Kepler mission
• Variations of the solar granulation motions with height using the GOLF/SoHO experiment
• Photospheric activity of the Sun with VIRGO and GOLF: Comparison with standard activity proxies
• A Comparison Between Global Proxies of the Sun's Magnetic Activity Cycle: Inferences from Helioseismology
• Sun-Like Magnetic Cycles in the Rapidly-Rotating Young Solar Analog HD 30495
• The Quasi-Biennial Periodicity (QBP) in velocity and intensity helioseismic observations
• On the frequency dependence of p-mode frequency shifts induced by magnetic activity in Kepler solar-like stars
• Magnetic activity cycles in solar-like stars: The cross-correlation technique of p-mode frequency shifts
• Validation of solar-cycle changes in low-degree helioseismic parameters from the Birmingham Solar-Oscillations Network
• Temporal variations in the acoustic signal from faculae
• Solar Oscillation Frequency Changes on Time Scales of Nine Days
• A possible long-term activity cycle for ι Horologii: First results from the HKα & SPI-HKα projects
• Damping and excitation variations of the solar acoustic modes using LOWL observations
• On the contribution of sunspots to the observed frequency shifts of solar acoustic modes
• A thorough analysis of the short- and mid-term activity-related variations in the solar acoustic frequencies

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• Asteroseismology of solar-type stars
• APOKASC-3: The Third Joint Spectroscopic and Asteroseismic catalog for Evolved Stars in the Kepler Fields
• Revisiting the impact of stellar magnetic activity on the detectability of solar-like oscillations by Kepler
• Detections of solar-like oscillations in dwarfs and subgiants with Kepler DR25 short-cadence data
• Magnetic activity evolution of solar-like stars: I. S_ph-Age relation derived from Kepler observations
• Temporal variation of the photometric magnetic activity for the Sun and Kepler solar-like stars
• Influence of magnetic activity on the determination of stellar parameters through asteroseismology
• Signatures of magnetic activity: On the relation between stellar properties and p-mode frequency variations
• Kepler-93: a testbed for detailed seismic modelling and orbital evolution of super-earths around solar-like stars
• Butterfly diagram of a Sun-like star observed using asteroseismology
• Asteroseismic constraints on active latitudes of solar-type stars: HD173701 has active bands at higher latitudes than the Sun
• Impact of magnetic activity on inferred stellar properties of main sequence Sun-like stars
• Multi-campaign Asteroseismic Analysis of eight Solar-like pulsating stars observed by the K2 mission
• Kepler main-sequence solar-like stars: surface rotation and magnetic-activity evolution
• On the characterization of GJ 504: a magnetically active planet-host star observed by the Transiting Exoplanet Survey Satellite (TESS)
• Luminaries in the Sky: The TESS Legacy Sample of Bright Stars. I. Asteroseismic detections in naked-eye main-sequence and sub-giant solar-like oscillators
• Sounding stellar cycles with Kepler - III. Comparative analysis of chromospheric, photometric and asteroseismic variability
• Asteroseismic modelling strategies in the PLATO era I. Mean density inversions and direct treatment of the seismic information
• Seismic differences between solar magnetic cycles 23 and 24 for low-degree modes
• Changes in granulation scales over the solar cycle seen with SDO/HMI and Hinode/SOT
• Seismic Signatures of Stellar Magnetic Activity -- What Can We Expect from TESS?
• Sensitivity of low-degree solar p modes to active and ephemeral regions: frequency shifts back to the Maunder Minimum
• Asteroseismic Inversions for Internal Sound Speed Profiles of Main-sequence Stars with Radiative Cores
• On the saturation of acoustic mode frequencies at high solar activity
• Brightness Fluctuation Spectra of Sun-Like Stars. I. The Mid-Frequency Continuum
• Influence of the magnetic activity cycle on mean density and acoustic radius inversions
• Asteroseismology of the G8 subgiant beta Aquilae with SONG-Tenerife, SONG-Australia and TESS
• They Do Change After All: 25 Years of GONG Data Reveal Variation of p-Mode Energy Supply Rates
• Asteroseismic Structure Inversions of Main-Sequence Solar-like Oscillators with Convective Cores
• The impact of rotation on the stochastic excitation of stellar acoustic modes in solar-like pulsators
• Empirical Relations for the Sensitivities of Solar-like Oscillations to Magnetic Perturbations
• Seismic signatures of magnetic activity in solar-type stars observed by Kepler