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Previous measurements of stellar properties for K2 stars in the EclipticPlane Input Catalog (EPIC; Huber et al. 2016) largely relied on photometry andproper motion measurements, with some added information from available spectraand parallaxes. Combining Gaia DR2 distances with spectroscopic measurements ofeffective temperatures, surface gravities, and metallicities from the Large SkyArea Multi-Object Fibre Spectroscopic Telescope (LAMOST) DR5, we computedupdated stellar radii and masses for 26,838 K2 stars. For 195,250 targetswithout a LAMOST spectrum, we derived stellar parameters using random forestregression on photometric colors trained on the LAMOST sample. In total, wemeasured spectral types, effective temperatures, surface gravities,metallicities, radii, and masses for 222,088 A, F, G, K, and M-type K2 stars.With these new stellar radii, we performed a simple reanalysis of 299 confirmedand 517 candidate K2 planet radii from Campaigns 1--13, elucidating a distinctplanet radius valley around 1.9 $R_{\oplus}$, a feature thus far onlyconclusively identified with Kepler planets, and tentatively identified with K2planets. These updated stellar parameters are a crucial step in the processtoward computing K2 planet occurrence rates.

Scaling K2. I. Revised Parameters for 222,088 K2 Stars and a K2 Planet Radius Valley at 1.9 $R_{\oplus}$