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The relative rarity of giant planets around low mass stars compared withsolar-type stars is a key prediction from core accretion planet formationtheory. In this paper we report on the discovery of four gas giant planets thattransit low mass late K and early M dwarfs. The planets HATS-74Ab (TOI 737b),HATS-75b (TOI 552b), HATS-76b (TOI 555b), and HATS-77b (TOI 730b), were alldiscovered from the HATSouth photometric survey and followed-up using TESS andother photometric facilities. We use the new ESPRESSO facility at the VLT toconfirm and systems and measure their masses. We find that that planets havemasses of 1.46 +- 0.14 MJ , 0.491 +- 0.039 MJ , 2.629 +- 0.089 MJ and 1.374+0.100-0.074 MJ , respectively, and radii of 1.032 +- 0.021 RJ , 0.884 +- 0.013RJ , 1.079 +- 0.031 RJ , and 1.165 +- 0.021 RJ, respectively. The planets allorbit close to their host stars with orbital periods ranging from 1.7319 d to3.0876 d. With further work we aim to test core accretion theory by using theseand further discoveries to quantify the occurrence rate of giant planets aroundlow mass host stars.

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