A comprehensive study on the K2-type binary V1393 Tau in four-year observations

Abstract

We carried out a low resolution spectrum, the first ground-based multi-color light curves (LCs) analysis, and Transiting Exoplanet Survey Satellite (TESS) data analysis for the binary V1393 Tau. We determined its spectral type of K2V and updated an orbital period 0.24738715 days. By the Wilson-Devinney program, we solved ten sets of light curves. From the BVRcIc-band $L{C}_{2022.11}$, we obtained a mass ratio $q=2.500\left(3\right)$ and a fill-out factor $f=11.73\left(6\right)\text{\%}$, which implies that V1393 Tau is a W-type shallow-contact binary. We traced the spot migration and evolution through modeling light curves during the past four years. The spot’s size alternately becomes smaller or bigger, and its longitude intervenes between $\lambda =82.39^{\circ }$ in $L{C}_{S70}$ and $102.56^{\circ }$ in $L{C}_{2022.10}$ except for $L{C}_{S32}$.