HATS-50b through HATS-53b: Four Transiting Hot Jupiters Orbiting G-type Stars Discovered by the HATSouth Survey*

Abstract

We report the discovery of four close-in transiting exoplanets (HATS-50b through HATS-53b), discovered using the HATSouth three-continent network of homogeneous and automated telescopes. These new exoplanets belong to the class of hot Jupiters and orbit G-type dwarf stars, with brightness in the range V  = 12.5–14.0 mag. While HATS-53 has many physical characteristics similar to the Sun, the other three stars appear to be metal-rich ( ), larger, and more massive. Three of the new exoplanets, namely HATS-50b, HATS-51b, and HATS-53b, have low density (HATS-50b: , ; HATS-51b: , ; HATS-53b: , ) and similar orbital periods ( days, days, days, respectively). Instead, HATS-52b is more dense (mass and radius ) and has a shorter orbital period ( days). It also receives an intensive radiation from its parent star and, consequently, presents a high equilibrium temperature ( K). HATS-50 shows a marginal additional transit feature consistent with an ultra-short-period hot super Neptune (upper mass limit 0.16 ), which will be able to be confirmed with TESS photometry.