Light curve solutions of the eccentric Kepler binaries KIC 11619964 and KIC 7118545 and mid-eclipse brightening of KIC 11619964

TL;DR

This study models the light curves of two eccentric Kepler binaries, revealing their stellar parameters and a peculiar mid-eclipse brightening in one system, suggesting complex stellar interactions.

Contribution

First detailed light curve solutions for these eccentric binaries, including the discovery of a rare mid-eclipse brightening event in KIC 11619964.

Findings

Determined orbital and stellar parameters with high accuracy.

Identified a 0.018 mag mid-eclipse brightening in KIC 11619964.

Found temperature difference of about 2000 K between components.

Abstract

We carried out light curve solutions of two eclipsing detached binaries on eccentric orbits observed by Kepler. The orbits and fundamental parameters of KIC 11619964 and KIC 7118545 were determined with a high accuracy by modeling of their photometric data. We found that the temperatures of their components differ by around 2000 K while the radii of their secondaries are more than twice smaller than those of the primaries. We detected a strange "brightening" of KIC 11619964 in the narrow phase range (+-0.0005) around the center of the primary eclipse reaching to 0.018 mag in amplitude. This "mid-eclipse brightening" needs follow-up observations with good time resolution.