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SN 2010MB: Direct evidence for a supernova interacting with a large amount of hydrogen-free circumstellar material

  • Author(s): Ben-Ami, S
  • Gal-Yam, A
  • Mazzali, PA
  • Gnat, O
  • Modjaz, M
  • Rabinak, I
  • Sullivan, M
  • Bildsten, L
  • Poznanski, D
  • Yaron, O
  • Arcavi, I
  • Bloom, JS
  • Horesh, A
  • Kasliwal, MM
  • Kulkarni, SR
  • Nugent, PE
  • Ofek, EO
  • Perley, D
  • Quimby, R
  • Xu, D
  • et al.
Abstract

We present our observations of SN 2010mb, a Type Ic supernova (SN) lacking spectroscopic signatures of H and He. SN 2010mb has a slowly declining light curve (LC) (600 days) that cannot be powered by 56Ni/56Co radioactivity, the common energy source for Type Ic SNe. We detect signatures of interaction with hydrogen-free circumstellar material including a blue quasi-continuum and, uniquely, narrow oxygen emission lines that require high densities (109 cm-3). From the observed spectra and LC, we estimate that the amount of material involved in the interaction was 3 M . Our observations are in agreement with models of pulsational pair-instability SNe described in the literature. © 2014. The American Astronomical Society. All rights reserved..

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