# Summary of K2 Program GO15033 Title: Probing the Planetary Population of High-Mass Stars (K2-GO5) PI: Gaudi, Bernard Scott (The Ohio State University) CoIs: Paetzold, Martin; Cochran, William D.; Shporer, Avi; Csizmadia, Szilard; Johnson, Marshall C; Eigmueller, Philipp; Grziwa, Sascha Objectives: To date most planet searches have been confined to stars of spectral type F and later, as hotter stars have fewer spectral lines and tend to be rapidly rotating, making precise radial velocity (RV) observations difficult. By observing a sample of A and early F stars, K2 can help to expand the number of known planets around stars with M~1.5-2.5 M_sun. This population has been probed largely through RV surveys of subgiants and giants in this mass range [1], but the masses of these stars have been debated [2]. During its primary mission, Kepler discovered a handful of planets around A-type stars, most notably Kepler-13 Ab [3], plus ~60 planet candidates that are awaiting validation. K2 observations of main sequence A and F stars will complement (sub)giant RV observations, as K2 is sensitive to smaller planets, and close-in planets that have already been engulfed by the (sub)giants. K2 can thus be used to expand the sample of known transiting planets around these stars. There are currently only ~20 such confirmed planets; this population is currently almost totally unexplored. We thus propose to search for planets around such stars with K2. Targets: We request 301 long cadence targets, ~1/2 of which will be in Field 16. This will build on the ~1500 targets we have been granted earlier in the K2 mission. The sample consists of A and early F-type dwarfs with 8