HATS-31b Through HATS-35b: Five Transiting Hot Jupiters Discovered by the HATSouth Survey

TL;DR

This paper reports the discovery of five new transiting hot Jupiter exoplanets from the HATSouth survey, detailing their properties, orbital characteristics, and implications for planetary inflation mechanisms.

Contribution

The discovery of five hot Jupiters with detailed characterization, including radii, masses, and orbital parameters, expanding the known sample of such planets and providing data for inflation studies.

Findings

Planets have radii between 1.23-1.64 RJ.

Orbits are consistent with circular models.

Planets orbit stars with V magnitudes 11.9-14.4 mag.

Abstract

We report the discovery of five new transiting hot Jupiter planets discovered by the HATSouth survey: HATS-31b through HATS-35b. These planets orbit moderately bright stars with V magnitudes within the range 11.9-14.4mag while the planets span a range of masses 0.88-1.22MJ, and have somewhat inflated radii between 1.23-1.64RJ.These planets can be classified as typical hot Jupiters, with HATS-31b and HATS-35b being moderately inflated gas giant planets with radii of $1.64 \pm 0.22$ RJ and 1.464+0.069-0.044RJ, respectively, that can be used to constrain inflation mechanisms. All five systems present a higher Bayesian evidence for a fixed circular orbit model than for an eccentric orbit. The orbital periods range from $1.8209993 \pm 0.0000016$ day for HATS-35b) to $3.377960 \pm 0.000012$ day for HATS-31b. Additionally, HATS-35b orbits a relatively young F star with an age of $2.13 \pm 0.51$ Gyr. We discuss the analysis to derive the properties of these systems and compare them in the context of the sample of well characterized transiting hot Jupiters known to date.