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 ( [ Fe / H ] = 0.2 - 0.3 ) , larger and more massive .
Three of the new exoplanets , namely HATS-50b , HATS-51b and HATS-53b , have low density ( HATS-50b : 0.39 \pm 0.10 M _ { J } , 1.130 \pm 0.075 R _ { J } ; HATS-51b : 0.768 \pm 0.045 M _ { J } , 1.41 \pm 0.19 R _ { J } ; HATS-53b : 0.595 \pm 0.089 M _ { J } , 1.340 \pm 0.056 R _ { J } ) and similar orbital period ( 3.8297 d , 3.3489 d , 3.8538 d , respectively ) .
Instead , HATS-52b is more dense ( mass 2.24 \pm 0.15 M _ { J } and radius 1.382 \pm 0.086 R _ { J } ) and has a shorter orbital period ( 1.3667 d ) .
It also receives an intensive radiation from its parent star and , consequently , presents a high equilibrium temperature ( T _ { eq } = 1834 \pm 73 K ) .
HATS-50 shows a marginal additional transit feature consistent with an ultra-short period hot super Neptune ( upper mass limit 0.16 M _ { J } ) , which will be able to be confirmed with TESS photometry .