A List of 49 New Stellar Twins from the Kepler Catalog of Eclipsing Binary Stars

TL;DR

This paper identifies 49 new eclipsing twin binary star candidates from Kepler data, analyzes their properties, and provides detailed physical parameters for a selected system, contributing to the understanding of binary star populations.

Contribution

The study presents a new catalog of 49 eclipsing twin binaries, including detailed spectral classification, distance analysis, and a case study with physical parameters derived using spectroscopic, photometric, and evolutionary modeling.

Findings

F-type twins dominate among eclipsing binaries.

Most binaries are within 200 pc of the galactic plane, indicating thin disk membership.

Physical parameters of V396 Gem are precisely determined, including mass, radius, temperature, and age.

Abstract

49 new eclipsing twin binary candidates are identified and analyzed based on Kepler eclipsing binary light curves. Their colours and spectral types are calculated according to our classification. A comparison of the spectral type distribution of eclipsing twin binary systems showed that F-type twins dominate among others, which agrees well with recent studies. The distance of eclipsing twin binaries from the galactic plane shows that F and G-type twins can be seen at any distance from the galactic plane and most of the known eclipsing binary twins are located within 200 pc of the galactic plane, which could be interpreted as these systems are members of thin disk population. As a case study, a twin binary system selected from our updated list of twins, V396~Gem, has been analyzed with spectroscopic and Kepler data. As a result, we have derived the physical parameters of the components of V396~Gem as $M_{1,2}(M_\odot)= 1.814\pm0.114$, $1.797\pm0.114$; $R_{1,2}(R_\odot)= 2.655\pm0.078$, $2.659\pm0.090$; $T_{\mathrm{eff}_{1,2}}(K)=7000\pm100$, $6978\pm100$; $[M/H]=0.11\pm0.03$. We have calculated the evolutionary status of the components by using MESA. Accurately derived physical parameters of the components of V396~Gem have allowed us to determine the age of the system as 1.168$\pm$0.149 Byrs.