HATS-74Ab, HATS-75b, HATS-76b, and HATS-77b: Four Transiting Giant Planets Around K and M Dwarfs*

Abstract The relative rarity of giant planets around low-mass stars compared with solar-type is a key prediction from the core-accretion planet formation theory. In this paper we report on discovery four gas that transit late K and early M dwarfs. HATS-74Ab (TOI 737b), HATS-75b 552b), HATS-76b 555b), HATS-77b 730b) were all discovered HATSouth photometric survey follow-up using TESS other facilities. We use new ESPRESSO facility at VLT to confirm systems measure their masses. find these have masses 1.46 ± 0.14 J, 0.491 0.039 2.629 0.089 1.374 ? 0.074 + 0.100 respectively, radii 1.032 0.021 R 0.884 0.013 1.079 0.031 1.165 respectively. orbit close host orbital periods ranging 1.7319 days 3.0876 days. With further work, aim test theory by discoveries quantify occurrence rate stars.