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SN 2017jgh is a type IIb supernova discovered by Pan-STARRS during theC16/C17 campaigns of the Kepler/K2 mission. Here we present the Kepler/K2 andground based observations of SN 2017jgh, which captured the shock cooling ofthe progenitor shock breakout with an unprecedented cadence. This eventpresents a unique opportunity to investigate the progenitors of strippedenvelope supernovae. By fitting analytical models to the SN 2017jgh lightcurve,we find that the progenitor of SN 2017jgh was likely a yellow supergiant withan envelope radius of $\sim50-290~R_{\odot}$, and an envelope mass of$\sim0-1.7~M_{\odot}$. SN 2017jgh likely had a shock velocity of$\sim7500-10300$ km s$^{-1}$. Additionally, we use the lightcurve of SN 2017jghto investigate how early observations of the rise contribute to constraints onprogenitor models. Fitting just the ground based observations, we find anenvelope radius of $\sim50-330~R_{\odot}$, an envelope mass of$\sim0.3-1.7~M_{\odot}$ and a shock velocity of $\sim9,000-15,000$ km s$^{-1}$.Without the rise, the explosion time can not be well constrained which leads toa systematic offset in the velocity parameter and larger uncertainties in themass and radius. Therefore, it is likely that progenitor property estimatesthrough these models may have larger systematic uncertainties than previouslycalculated.

SN2017jgh - A high-cadence complete shock cooling lightcurve of a SN IIb with the Kepler telescope