We report six new inflated hot Jupiters (HATS-25b through HATS-30b) discovered using the HATSouth global network of automated telescopes. The planets orbit stars with V magnitudes in the range of ∼12-14 and have masses in the largely populated 0.5MJ-0.7MJ region of parameter space but span a wide variety of radii, from 1.17RJ to 1.75RJ. HATS-25b, HATS-28b, HATS-29b, and HATS-30b are typical inflated hot Jupiters (RP = 1.17-1.26RJ) orbiting G-type stars in short period (P = 3.2-4.6 days) orbits. However, HATS-26b (Rp = 1.75RJ, P = 3.3024 days) and HATS-27b (Rp = 1.50RJ, P = 4.6370 days) stand out as highly inflated planets orbiting slightly evolved F stars just after and in the turn-off points, respectively, which are among the least dense hot Jupiters, with densities of 0.153 and 0.180 , respectively. All the presented exoplanets but HATS-27b are good targets for future atmospheric characterization studies, while HATS-27b is a prime target for Rossiter - McLaughlin monitoring in order to determine its spin-orbit alignment given the brightness (V = 12.8) and stellar rotational velocity (v sin i ≈ 9.3 km s-1) of the host star. These discoveries significantly increase the number of inflated hot Jupiters known, contributing to our understanding of the mechanism(s) responsible for hot Jupiter inflation.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
- stars: individual (HATS-25, HATS-26, HATS-27, HATS-28, HATS-29, HATS-30)