HATS-22b, HATS-23b and HATS-24b: Three new transiting Super-Jupiters from the HATSouth Project

TL;DR

This paper reports the discovery of three new transiting hot Jupiters from the HATSouth survey, expanding the known population of ~2MJ planets and providing insights into their orbital characteristics and potential migration mechanisms.

Contribution

The paper presents three newly discovered hot Jupiters with detailed characterization, adding valuable data on high-mass transiting exoplanets and their orbital properties.

Findings

HATS-22b has a high planet-to-star mass ratio suggesting eccentricity-driven migration.

HATS-23b is a large-radius planet on a grazing orbit around a Sun-like star.

HATS-24b is an inflated hot Jupiter orbiting an F-dwarf star.

Abstract

We report the discovery of three moderately high-mass transiting hot Jupiters from the HATSouth survey: HATS-22b, HATS-23b and HATS-24b. These planets add to the numbers of known planets in the ~2MJ regime. HATS-22b is a 2.74+/-0.11 MJ mass and 0.953+0.048/-0.029 RJ radius planet orbiting a V = 13.455 +/- 0.040 sub-silar mass (M_star = 0.759+/-0.019 M_sun; R_star = 0.759+/-0.019 R_sun) K-dwarf host star on an eccentric (e = 0.079 +/- 0.026) orbit. This planet's high planet-to-stellar mass ratio is further evidence that migration mechanisms for hot Jupiters may rely on exciting orbital eccentricities that bring planets closer to their parent stars followed by tidal circularisation. HATS-23b is a 1.478 +/- 0.080 MJ mass and 1.69 +/- 0.24 RJ radius planet on a grazing orbit around a V = 13.901 +/- 0.010 G-dwarf with properties very similar to those of the Sun (M_star = 1.115 +/- 0.054 M_sun; R_star = 1.145 +/- 0.070 R_sun). HATS-24b orbits a moderately bright V = 12.830 +/- 0.010 F-dwarf star (M_star = 1.218 +/- 0.036 M_sun; R_star = 1.194+0.066/-0.041 R_sun). This planet has a mass of 2.39 +0.21/-0.12 MJ and an inflated radius of 1.516 +0.085/-0.065 RJ.