HATS-31b through HATS-35b: Five Transiting Hot Jupiters Discovered By the HATSouth Survey

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 of 11.9–14.4 mag while the planets span a range of masses of 0.88–1.22 MJ and have somewhat inflated radii between 1.23 and 1.64 RJ. 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 0.2  2 RJ and - + 1.464 0.044 0.069 RJ, 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 0.0000016  day for HATS-35b) to 3.377960 0.00001  2 day for HATS-31b. Additionally, HATS-35b orbits a relatively young F star with an age of 2.13 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.