Direct evidence for a supernova interacting with a large amount of hydrogen-free circumstellar material

Sagi Ben-Ami, Avishay Gal-Yam, Paolo A. Mazzali +16

We present our observations of SN 2010mb, a Type Ic SN lacking spectroscopic signatures of H and He. SN 2010mb has a slowly-declining light curve ($\sim 600$days) that cannot be p…