BO Ari Light Curve Analysis using Ground-Based and TESS Data

TL;DR

This study combines ground-based and TESS photometry to analyze BO Aries, revealing its binary nature, system parameters, and distance, with improved accuracy using MCMC and Wilson-Devinney modeling.

Contribution

It introduces a comprehensive analysis of BO Aries using combined photometric data and advanced modeling techniques, providing new system parameters and distance estimate.

Findings

BO Aries is an A-type binary with a mass ratio of 0.2074.

The orbital inclination is 82.18 degrees.

The system's distance is estimated at 142 parsecs.

Abstract

We present new BVR band photometric light curves of BO Aries obtained in 2020 and combined them with the Transiting Exoplanet Survey Satellite (TESS) light curves. We obtained times of minima based on Gaussian and Cauchy distributions and then applied the Monte Carlo Markov Chain (MCMC) method to measure the amount of uncertainty from our CCD photometry and TESS data. A new ephemeris of the binary system was computed employing 204 times of minimum. The light curves were analyzed using the Wilson-Devinney binary code combined with the Monte Carlo (MC) simulation. For this light curve solution, we considered a dark spot on the primary component. We conclude that this binary is an A-type system with a mass ratio of q=0.2074+-0.0001, an orbital inclination of i=82.18+-0.02 deg, and a fillout factor of f=75.7+-0.8%. Our results for the a(Rsun) and q parameters are consistent with the results of the Xu-Dong Zhang and Sheng-Bang Qian (2020) model. The absolute parameters of the two components were calculated and the distance estimate of the binary system was found to be 142+-9 pc.