SN 2010mb: Direct Evidence for a Supernova Interacting with a Large Amount of Hydrogen-free Circumstellar Material

Sagi Ben-Ami, Avishay Gal-Yam, Paolo A. Mazzali, Orly Gnat, Maryam Modjaz, Itay Rabinak, Mark Sullivan, Lars Bildsten, Dovi Poznanski, Ofer Yaron, Iair Arcavi, Joshua S. Bloom, Assaf Horesh, Mansi M. Kasliwal, Shrinivas R. Kulkarni, Peter E. Nugent, Eran O. Ofek, Daniel Perley, Robert Quimby, Dong Xu