Light curve solutions of the eccentric binaries KIC 10992733, KIC 5632781, KIC 10026136 and their out-of-eclipse variability

TL;DR

This study analyzes the light curves of three eccentric eclipsing binaries from Kepler data, revealing stellar parameters, eclipse types, and out-of-eclipse variability, including star spots and tidally-induced features consistent with theoretical models.

Contribution

The paper provides detailed light curve solutions and characterizes out-of-eclipse variability for three eccentric binaries, including confirmation of theoretical predictions for heartbeat stars.

Findings

KIC 10992733 shows star spot variability.

KIC 5632781 and KIC 10026136 exhibit tidally-induced features.

Characteristics of periastron features match theoretical models.

Abstract

We determined the orbits and stellar parameters of three eccentric eclipsing binaries by light curve solutions of their Kepler data. KIC 10992733 and KIC 5632781 undergo total eclipses while KIC 10026136 reveals partial eclipses. The components of the targets are G and K stars. KIC 10992733 exhibited variations which were attributed to variable visibility of spot(s) on asynchronously rotating component. KIC 5632781 and KIC 1002613 reveal tidally-induced features at periastron, i.e. they might be considered as eclipsing heartbeat stars. The characteristics of the periastron features (shape, width and amplitude) confirm the theoretical predictions.