Confined dense circumstellar material surrounding a regular type II supernova

  title={Confined dense circumstellar material surrounding a regular type II supernova},
  author={Ofer Yaron and Daniel A. Perley and Avishay Gal-Yam and Jose H Groh and Assaf Horesh and Eran O. Ofek and Shrinivas R. Kulkarni and Jesper Sollerman and Claes Fransson and Adam Rubin and P. Szabo and Nir Sapir and F. Taddia and S. Bradley Cenko and Stefano Valenti and Iair Arcavi and D. Andrew Howell and Mansi M. Kasliwal and Paul M. Vreeswijk and Danny Khazov and Ori D. Fox and Y. Cao and Orly Gnat and Patrick L. Kelly and Peter E. Nugent and Alexei V. Filippenko and Russ R. Laher and Przemek R. Wozniak and W. H. Lee and Umaa Rebbapragada and Kate Maguire and M Sullivan and Maayane T. Soumagnac},
  journal={Nature Physics},
With the advent of new wide-field, high-cadence optical transient surveys, our understanding of the diversity of core-collapse supernovae has grown tremendously in the last decade. However, the pre-supernova evolution of massive stars, which sets the physical backdrop to these violent events, is theoretically not well understood and difficult to probe observationally. Here we report the discovery of the supernova iPTF 13dqy = SN 2013fs  a mere ~3 h after explosion. Our rapid follow-up… Expand

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