EGPM. III. HPF RVs & activity of young giant planets

This survey was designed to measure the occurrence rate of giant planets interior to the water ice line of young Sun-like stars, compare this to the prevalence of giant planets at older ages, and provide constraints on the timescale and dominant inward migration mechanism of giant planets. Our final sample amounts to 85 single young (20-200Myr) G and K dwarfs that we target across a 4yr time baseline with the near-infrared Habitable-zone Planet Finder spectrograph at McDonald Observatory's Hobby- Eberly Telescope.

As part of this survey, we discovered the young hot Jupiter HS Psc b. We characterize survey detection completeness with realistic injection-recovery tests and measure an occurrence rate of 1.9_-1.4_^+2.6^% for intermediate-age giant planets (0.3M_J_<Msin(i)<13M_J_) within 2.5AU. This is lower than the field age occurrence rate for the same planet masses and separations and favors an increase in the prevalence of giant planets over time from ~100Myr to several Gyr, although our results cannot rule out a constant rate.