Red giant asteroseismic binaries in the Kepler field
arXiv:2509.13412 · doi:10.1051/0004-6361/202555884
Abstract
Systems in which two oscillating stars are observed in the same light curve, so-called asteroseismic binaries (ABs), arise from either chance alignments or gravitationally bound stars. In the latter case, ABs offer a novel way to find binary systems and combine asteroseismology and orbital dynamics to determine precise stellar parameters for both stars. Such systems provide valuable tests to stellar models and scaling relations. While population synthesis studies predict approximately 200 ABs in the Kepler long-cadence data, only a few have been detected to date. In this work, we aim to (1) expand the sample of ABs in Kepler data, (2) estimate global asteroseismic parameters for both stars in each AB, and (3) assess whether these pairs are gravitationally bound. We analysed 40 well-resolved ABs identified in Kepler long-cadence data, and matched these solar-like oscillators with Gaia DR3 sources using spectroscopic estimates of . To assess whether each pair is gravitationally bound, we checked their projected separation and parallax consistency, and compared observed total orbital velocity differences from astrometry with theoretical predictions from Keplerian orbits. We find that most ABs appear to be chance alignments. However, two systems, KIC 6501237 and KIC 10094545, show orbital velocities, seismic masses, and evolutionary stages consistent with a wide binary configuration, with probabilities of ~50% and ~25%, respectively. Furthermore, eleven ABs are likely spatially unresolved binaries based on Gaia multiplicity indicators. Our findings suggest that most seismically resolved ABs in the Kepler field are not gravitationally bound, in contrast to earlier population synthesis predictions. Remarkably, the two wide binary candidates identified here are promising benchmarks for asteroseismic calibration. Spectroscopic follow-up is necessary to confirm their binary nature.
18 pages, 10 figures. Accepted for publication in A&A. Abstract abridged for arXiv submission
References in corpus (86)
- emcee: The MCMC Hammer
- PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
- Gaia Data Release 2: The astrometric solution
- Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
- The Dartmouth Stellar Evolution Database
- The K2 Mission: Characterization and Early results
- Accurate masses and radii of normal stars: modern results and applications
- Gaia Early Data Release 3: The astrometric solution
- Gaia Early Data Release 3: Parallax bias versus magnitude, colour, and position
- Improving PARSEC models for very low mass stars
- SB9: The Ninth Catalogue of Spectroscopic Binary Orbits
- Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars
- HERMES: a high-resolution fibre-fed spectrograph for the Mercator telescope
- Estimating distances from parallaxes
- A million binaries from Gaia eDR3: sample selection and validation of Gaia parallax uncertainties
- Nominal values for selected solar and planetary quantities: IAU 2015 Resolution B3
- Unresolved stellar companions with Gaia DR2 astrometry
- Gaia Data Release 3 Properties and validation of the radial velocities
- Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue
- The Second APOKASC Catalog: The Empirical Approach
- Preparation of Kepler lightcurves for asteroseismic analyses
- The connection between stellar granulation and oscillation as seen by the Kepler mission
- APOGEE Data Releases 13 and 14: Data and Analysis
- Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
- Fundamental Properties of Stars using Asteroseismology from Kepler & CoRoT and Interferometry from the CHARA Array
- Gaia Data Release 3: Analysis of RVS spectra using the General Stellar Parametriser from spectroscopy
- Asteroseismology of 16000 Kepler Red Giants: Global Oscillation Parameters, Masses, and Radii
- Characterization of the power excess of solar-like oscillations in red giants with Kepler
- BRITE-Constellation: nanosatellites for precision photometry of bright stars
- Mixed modes in red giants: a window on stellar evolution
- Stellar population synthesis based modelling of the Milky Way using asteroseismology of 13000 Kepler red giants
- Gaia Data Release 3: Analysis of the Gaia BP/RP spectra using the General Stellar Parameterizer from Photometry
- 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
- HD 80606 b, a planet on an extremely elongated orbit
- Period spacings in red giants II. Automated measurement
- PARSEC V2.0: Stellar tracks and isochrones of low and intermediate mass stars with rotation
- The universal red-giant oscillation pattern; an automated determination with CoRoT data
- Where are the most ancient stars in the Milky Way?
- Disk and Halo Wide Binaries from the Revised Luyten Catalog: Probes of Star Formation and MACHO Dark Matter
- Interferometric radii of bright Kepler stars with the CHARA Array: θ Cygni and 16 Cygni A and B
- Gaia Data Release 3. Astrometric binary star processing
- Pulsating red giant stars in eccentric binary systems discovered from Kepler space-based photometry
- Impact on asteroseismic analyses of regular gaps in Kepler data
- 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
- Gap interpolation by inpainting methods : Application to Ground and Space-based Asteroseismic data
- Wide Binaries in Tycho-{\it Gaia}: Search Method and the Distribution of Orbital Separations
- Surface Activity and Oscillation Amplitudes of Red Giants in Eclipsing Binaries
- Astrometric Identification of Nearby Binary Stars I: Predicted Astrometric Signals
- Identical or fraternal twins? : The chemical homogeneity of wide binaries from Gaia DR2
- Gaia DR3 detectability of unresolved binary systems
- High precision abundances in the 16 Cyg binary system: a signature of the rocky core in the giant planet
- Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission
- Discovery of a red giant with solar-like oscillations in an eclipsing binary system from Kepler space-based photometry
- Chemical signatures of planets: beyond solar-twins
- Red Giants in Eclipsing Binary and Multiple-Star Systems: Modeling and Asteroseismic Analysis of 70 Candidates from Kepler Data
- Rapid Rotation of Low-Mass Red Giants Using APOKASC: A Measure of Interaction Rates on the Post-main-sequence
- APOKASC-3: The Third Joint Spectroscopic and Asteroseismic catalog for Evolved Stars in the Kepler Fields
- Asteroseismic inferences on red giants in open clusters NGC 6791, NGC 6819 and NGC 6811 using Kepler
- Oscillating red giants in eclipsing binary systems: empirical reference value for asteroseismic scaling relation
- Signatures of rocky planet engulfment in HAT-P-4. Implications for chemical tagging studies
- Formation of wide binary stars from adjacent cores
- The chemical composition of HIP34407/HIP34426 and other twin-star comoving pairs
- Active red giants: close binaries versus single rapid rotators
- KIC 9246715: The Double Red Giant Eclipsing Binary With Odd Oscillations
- Kepler Observations of the Asteroseismic Binary HD 176465
- Spectroscopic and seismic analysis of red giants in eclipsing binaries discovered by Kepler
- Model-independent measurement of internal stellar structure in 16 Cygni A and B
- Seismic probing of the first dredge-up event through the eccentric red-giant & red-giant spectroscopic binary KIC9163796
- Insights from the APOKASC Determination of the Evolutionary State of Red-Giant Stars by consolidation of different methods
- Asteroseismology of red giants as a tool for studying stellar populations: first steps
- HIDES spectroscopy of bright detached eclipsing binaries from the field - III. Spectral analysis, updated parameters, and new systems
- Improved Constraints on the Initial-to-Final Mass Relation of White Dwarfs using Wide Binaries
- Prospects for detecting asteroseismic binaries in Kepler data
- Automated asteroseismic peak detections
- Coefficients of variation for detecting solar-like oscillations
- Gaia Data Release 3: spectroscopic binary-star orbital solutions. The SB1 processing chain
- Detailed Abundances of Planet-Hosting Wide Binaries. II. HD80606 + HD80607
- 99 oscillating red-giant stars in binary systems with NASA TESS and NASA Kepler identified from the SB9-Catalogue
- Asteroseismology of KIC 7107778: a binary comprising almost identical subgiants
- Kepler meets Gaia DR3: homogeneous extinction-corrected color-magnitude diagram and binary classification
- Oscillating red-giant stars in eccentric binary systems
- DUETS: Setting expectations for asteroseismic binaries and binary products with synthetic populations
- KIC 2568888: To be or not to be a binary
- Power density spectra morphologies of seismically unresolved red-giant asteroseismic binaries