Power density spectra morphologies of seismically unresolved red-giant asteroseismic binaries
arXiv:2506.01745 · doi:10.1051/0004-6361/202555279
Abstract
Asteroseismic binaries are two oscillating stars detected in a single light curve. These systems provide robust constraints on stellar models from the combination of dynamical and asteroseismical stellar parameters. Predictions suggested that approximately 200 asteroseismic binaries may exist among the Kepler long-cadence data, and the majority of them consist of two red-clump stars. However, detecting these systems is challenging when the binary components exhibit oscillations at similar frequencies that are indistinguishable. In this study, we predict the morphologies of power density spectra (PDS) of seismically unresolved red-giant asteroseismic binaries to provide examples that can be used to identify among observed stars. We created 5,000 artificial asteroseismic binary (AAB) systems by combining the KASOC light curves of red giants with oscillations at similar frequency ranges. To quantify the complexity of the oscillation patterns, we used the maximum signal-to-noise ratio of the background-normalized PDS and Shannon entropy. Additionally, we identified the radial and quadrupole mode pairs for the individual binary components and determined their impact on the PDS morphologies of AABs. Our results reveal that the majority of AABs consist of the two red-clump stars. The PDS of AABs generally exhibits increased entropy and decreased oscillation power compared to individual components. We focused on the AABs whose stellar components have similar brightness and classified them into four distinct morphologies: single star-like PDS, aligned, partially aligned, and misaligned. Most AABs with detectable oscillations from both components show complex oscillation patterns. Therefore, unresolved asteroseismic binaries with low oscillation power and complex oscillation patterns as characterized by high entropy offer a potential explanation to understand the observed stars with complex PDS.
arXiv commentaccepted for publication in A&A
References in corpus (44)
- emcee: The MCMC Hammer
- Binary interaction dominates the evolution of massive stars
- A Survey of Stellar Families: Multiplicity of Solar-Type Stars
- Accurate masses and radii of normal stars: modern results and applications
- Stellar Multiplicity
- Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
- Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars
- Kepler Eclipsing Binary Stars. I. Catalog and Principal Characterization of 1879 Eclipsing Binaries in the First Data Release
- Kepler Eclipsing Binary Stars. VII. The Catalog of Eclipsing Binaries Found in the Entire Kepler Data-Set
- Kepler Eclipsing Binary Stars. II. 2165 Eclipsing Binaries in the Second Data Release
- Testing Scaling Relations for Solar-Like Oscillations from the Main Sequence to Red Giants using Kepler Data
- The APOKASC Catalog: An Asteroseismic and Spectroscopic Joint Survey of Targets in the Kepler Fields
- The Second APOKASC Catalog: The Empirical Approach
- The connection between stellar granulation and oscillation as seen by the Kepler mission
- Gaia Data Release 3: Stellar multiplicity, a teaser for the hidden treasure
- 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
- Asteroseismology of red giants from the first four months of Kepler data: Global oscillation parameters for 800 stars
- The universal red-giant oscillation pattern; an automated determination with CoRoT data
- Asymptotic and measured large frequency separations
- Pulsating red giant stars in eccentric binary systems discovered from Kepler space-based photometry
- Automated preparation of Kepler time series of planet hosts for asteroseismic analysis
- Characterisation of red-giant stars in the public Kepler data
- Discovery of a red giant with solar-like oscillations in an eclipsing binary system from Kepler space-based photometry
- Red Giants in Eclipsing Binary and Multiple-Star Systems: Modeling and Asteroseismic Analysis of 70 Candidates from Kepler Data
- Dipole modes with depressed amplitudes in red giants are mixed modes
- APOKASC-3: The Third Joint Spectroscopic and Asteroseismic catalog for Evolved Stars in the Kepler Fields
- Modelling Kepler Red Giants in Eclipsing Binaries:Calibrating the Mixing Length Parameter with Asteroseismology
- Suppression of quadrupole and octupole modes in red giants observed by Kepler
- KIC 9246715: The Double Red Giant Eclipsing Binary With Odd Oscillations
- Kepler Observations of the Asteroseismic Binary HD 176465
- 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
- TESS Data for Asteroseismology (T'DA) Stellar Variability Classification Pipeline: Set-Up and Application to the Kepler Q9 Data
- Prospects for detecting asteroseismic binaries in Kepler data
- Automated asteroseismic peak detections
- Evidence for compact binary systems around Kepler red giants
- 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
- Red Horizontal Branch stars: an asteroseismic perspective
- Asteroseismic and orbital analysis of the triple star system HD 188753 observed by Kepler
- Multiscale entropy analysis of astronomical time series. Discovering subclusters of hybrid pulsators
- DUETS: Setting expectations for asteroseismic binaries and binary products with synthetic populations
- KIC 2568888: To be or not to be a binary