Diversity in Evolutionary Status and Magnetic Activity among Solar-Type Twin Detached Eclipsing Binaries

Abstract

We present a combined photometric and spectroscopic analysis of four detached eclipsing binaries (KIC 8957954, KIC 10593759, KIC 8302455, and TIC 207398432), all of which exhibit composite G-type spectra and nearly equal mass ratios. Based on survey data and our own observations, we measured radial velocities with the broadening function method, applied the fd3 program for spectral disentangling, and modeled the light curves with the Wilson-Devinney code to determine accurate absolute parameters. The results reveal significant differences in evolutionary stages and magnetic activity despite their nearly equal masses. Both components of KIC 8957954 and KIC 8302455 are on the main sequence; KIC 10593759 has evolved to the subgiant stage; and in TIC 207398432, the secondary has entered the red giant phase. Stronger magnetic activity is observed in KIC 10593759 and TIC 207398432, characterized by rapid O'Connell Effect Ratio variations, with the latter also exhibiting multiple superflare events. In addition, the spectral characteristics of TIC 207398432 suggest that it may be part of a hierarchical triple system. This study provides precise absolute parameters for twin binaries and offers important observational evidence for understanding their evolutionary diversity, magnetic activity, and the possible presence of tertiary companions.

Accepted for publication in The Astrophysical Journal Supplement Series

References in corpus (26)

• The Sloan Digital Sky Survey: Technical Summary
• The Transiting Exoplanet Survey Satellite
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Accurate masses and radii of normal stars: modern results and applications
• Kepler Mission Design, Realized Photometric Performance, and Early Science
• The First Data Release (DR1) of the LAMOST general survey
• Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec
• Superflares on Solar Type Stars Observed with Kepler I. Statistical Properties of Superflares
• A database of high and medium-resolution stellar spectra
• Kepler Eclipsing Binary Stars. VII. The Catalog of Eclipsing Binaries Found in the Entire Kepler Data-Set
• ULySS: A Full Spectrum Fitting Package
• Modern stellar spectroscopy caveats
• The Formation of Close Binary Systems by Dynamical Interactions and Orbital Decay
• Initial Characteristics of Kepler Short Cadence Data
• Predicting the Properties of Binary Stellar Systems: The Evolution of Accreting Protobinary Systems
• TESS Eclipsing Binary Stars. I. Short cadence observations of 4584 eclipsing binaries in Sectors 1-26
• The Anticorrelated Nature of the Primary and Secondary Eclipse Timing Variations for the Kepler Contact Binaries
• Detached double-lined eclipsing binaries as critical tests of stellar evolution : Age and metallicity determinations from the HR diagram
• The TESS light curve of AI Phoenicis
• Spectroscopic binaries with components of similar mass
• Simultaneous Optical and X-ray Observations of Flares and Rotational Modulation on the RS CVn Binary HR 1099 (V711 Tau) from the MUSICOS 1998 Campaign
• Twins Among the Low Mass Spectroscopic Binaries
• Twins like to be seen: Observational biases affecting spectroscopically selected binary stars