NSVS 01286630: A Detached Binary with a Close-in Companion

TL;DR

This study presents detailed photometric analysis of NSVS 01286630, revealing it as an active detached eclipsing binary with a potential third companion influencing its orbital dynamics.

Contribution

The paper provides new multi-color light curves and photometric solutions, identifying a third body through eclipse timing variations and analyzing the system's activity and orbital characteristics.

Findings

NSVS 01286630 is a detached eclipsing binary with high inclination.

The system shows cyclic eclipse timing variations with a 3.61-year period.

A third companion with about 0.11 solar masses likely influences the binary's orbit.

Abstract

New photometric observations of NSVS 01286630 were performed and two sets of four-color (B, V , Rc, Ic) light curves (LCs) were obtained. Using the 2013 version of the Wilson-Devinney (W-D) code, we analyzed these data. The photometric solutions reveal that NSVS 01286630 is an active detached eclipsing binary (EB) with a high orbit inclination. Remarkably, the temperature of the primary component (the hotter star) is higher than the secondary one, but, the value of mass ratio q(M2/M1) for NSVS 0128663 is more than 1, which can be explained that the surface of the secondary component of NSVS 01286630 is covered with big cool-star-spots. Based on our new CCD mid-eclipse times and the data published until now, the variations of the mid-eclipse times were reanalyzed in detail using a weighted least-squares method. It is discovered that the (O-C) diagram of the system shows a cyclic oscillation with a period of 3.61 yr and an amplitude of 0.001 days. The cyclic variation may be caused by the light travel time effect (LTTE) due to the presence of a third companion, whose mass we calculated is about 0.11 solar mass. The third body may affect the orbital evolution of the central binary system by transferring the angular momentum.