Work

First and comprehensive study of V0757 Puppis: γ –Doradus pulsator in detached eclipsing binary

Year: 2026

Type: article

Abstract: Pulsating stars in detached eclipsing binary systems are known for providing many important pieces of physical information which constrain both stellar structure and evolution theories. To date, fewer than 50 $\gamma$ Doradus stars have been found in eclipsing binary systems, making them important targets in the study of g-mode pulsation inside the stars. We present a comprehensive physical and pulsational analysis of V0757 Puppis (TIC 6939791), a detached eclipsing binary system observed by the Transiting Exoplanet Survey Satellite mission (Sectors 7, 34, 61, and 88) and followed up with ground-based spectroscopy from the Thai National Telescope. By combining light curve modeling with radial velocities derived from medium-resolution spectra, we determined the fundamental stellar and atmospheric parameters with high precision. The system consists of an F2V primary ($M_1=1.305\pm 0.026{\, M_\odot }, R_1=1.643\pm 0.020{\, R_\odot }$) and a G1V secondary ($M_2=0.934\pm 0.030{\, M_\odot }, R_2=0.941\pm 0.079{\, R_\odot }$). We performed a detailed frequency analysis of the residual light curves, identifying two dominant independent pulsation frequencies at $f\sim 0.79\:$c d$^{-1}$ and $0.98\:$c d$^{-1}$. These frequencies, along with the derived pulsation constant ($Q\sim 0.6\:$d), confirm the primary component as a $\gamma$ Doradus pulsator. An analysis of eclipse timing variations reveals non-detection of third-body companions with the currently available dataset, strengthened by the result of Gaia astrometric analysis. Evolutionary modeling indicates the system is ${\sim}2.2\:$Gyr old, with the primary expected to fill its Roche lobe in ${\sim}1\:$Gyr. Additionally, we calculate a distance of $d\approx 350\:$pc based on orbital and SED modeling, which is in excellent agreement with previous measurements using parallax distance.

Source: Publications of the Astronomical Society of Japan

DOI: 10.1093/pasj/psag128

Authors: B Danang S Budi, Bryant Randolph, Rafa N Akilah, Evan I Akbar, Hakim L Malasan, Puji Irawati