Orbital and stellar parameters for 2M06464003+0109157: a double-lined eclipsing binary of spotted, sub-solar twins

TL;DR

This paper presents a detailed analysis of a double-lined eclipsing binary system with nearly equal-mass, sub-solar stars, using combined photometric and spectroscopic data to derive orbital and stellar parameters, including star spots.

Contribution

The study provides the first comprehensive characterization of 2M06464003+0109157, demonstrating methods to extract physical parameters from survey data for eclipsing binaries.

Findings

Components have nearly equal masses (~0.57 M_sun).

System's inclination and radii measured from light curves.

Star spots are necessary to model out-of-eclipse variations.

Abstract

We calculated physical and orbital properties for 2M06464003+0109157, a 1.06 day eclipsing double lined spectroscopic binary. We modelled the system's ASAS-SN and TESS light curves, measuring the system's inclination and radii of each component. Extracting radial velocities for each component from 6 SDSS/APOGEE spectra, we measured the system's mass ratio and performed a full orbital fit. Our analysis indicates that 2M06464003+0109157 has components with nearly equal masses ($m_1/m_2 =0.99 \pm 0.01$; $M_1{_,}{_2} = 0.57 \pm 0.015$ M$_\odot$) and comparable radii ($R_1 = 0.66 \pm 0.05$ R$_\odot$, $R_2 = 0.57 \pm 0.06$ R$_\odot$). The solution required two star spots to incorporate the out of eclipse variation that is seen in the light curve. We report our full characterization of this system, and prospects for similar analyses using survey data to measure precise physical and orbital properties for EBs.