Photometric Solutions for 83 Neglected Eclipsing Binaries Using TESS Data

Abstract

We present a comprehensive photometric analysis of 83 eclipsing binary systems using high-precision space photometry from the Transiting Exoplanet Survey Satellite (TESS). The targets were selected from the catalog of Avvakumova et al. to resolve historical classification uncertainties and characterize systems lacking modern data. Using the ELISa modeling code and a Markov Chain Monte Carlo approach, we derived fundamental photometric parameters as: q—photometric mass ratio, i—inclination, T2/T1—temperature ratio, Ω1, Ω2—surface potentials, R1eq , R2eq —equivalent radii in units of semimajor axis. The eight systems exhibit continuous period changes, three show potential light-time effects, and eleven require a third-light contribution. We modeled 26 active systems by incorporating a stellar spot. Using period–color and temperature–color diagrams, we identified several highly anomalous systems that challenge traditional classification schemes. The long-period contact candidate IT Nor (P ≈ 1.75 days) is reinterpreted as a semidetached Algol-type system. Conversely, GX Nor (P ≈ 0.27 days) is identified as a rare, short-period detached binary near the contact boundary. The hot, early-type systems V884 Mon and V395 And also occupy atypical parameter space for their short orbital periods, likely representing key transitional evolutionary phases.