Hydra sp. obs. of K2 planet-host stars

We estimated the effects that including Zeeman-sensitive FeI lines have on the derived stellar parameters for young and possibly active stars in our sample and found them not to be significant. Stellar masses and radii were derived by combining the stellar parameters with Gaia EDR3 and V magnitudes and isochrones. The measured stellar radii have a 4.2% median internal precision, leading to a median internal uncertainty of 4.4% in the derived planetary radii.

With our sample of 83 confirmed planets orbiting K2 host stars, the radius gap near R_planet_~1.9R_{Earth}_ is detected, in agreement with previous findings. Relations between the planetary radius, orbital period, and metallicity are explored and these also confirm previous findings for Kepler 1 systems.