The Effects on Supernova Shock Breakout and Swift Light Curves Due to   the Mass of the Hydrogen-Rich Envelope
  Mass loss remains one of the primary uncertainties in stellar evolution. In the most massive stars, mass loss dictates the circumstellar medium and can significantly alter the fate of the star. Mass loss is caused by a variety of wind mechanisms and also through binary interactions. Supernovae are excellent probes of this mass loss, both the circumstellar material and the reduced mass of the hydrogen-rich envelope. In this paper, we focus on the effects of reducing the hydrogen-envelope mass on the supernova light curve, studying both the shock breakout and peak light curve emission for a wide variety of mass loss scenarios. Even though the trends of this mass loss will be masked somewhat by variations caused by different progenitors, explosion energies, and circumstellar media, these trends have significant effects on the supernova light-curves that should be seen in supernova surveys. We conclude with a comparison of our results to a few key observations. 
Amanda J. Bayless, Wesley Even, Lucille H. Frey, Chris L. Fryer, Peter   W. A. Roming, Patrick A. Young
astro-ph.HE astro-ph.SR