We present observations of the Type Ic supernova (SN Ic) 2011bm spanning a period of about one year. The data establish that SN 2011bm is a spectroscopically normal SN Ic with moderately low ejecta velocities and with a very slow spectroscopic and photometric evolution (more than twice as slow as SN 1998bw). The Pan-STARRS1 retrospective detection shows that the rise time from explosion to peak was 40 days in the R band. Through an analysis of the light curve and the spectral sequence, we estimate a kinetic energy of 7-17 foe and a total ejected mass of 7-17 Mo, 5-10 Mo of which is oxygen and 0.6-0.7 Mo is 56Ni. The physical parameters obtained for SN 2011bm suggest that its progenitor was a massive star of initial mass 30-50 Mo. The profile of the forbidden oxygen lines in the nebular spectra show no evidence of a bi-polar geometry in the ejected material.
@article{arxiv.1203.1933,
title = {A spectroscopically normal type Ic supernova from a very massive progenitor},
author = {Stefano Valenti and Stefan Taubenberger and Andrea Pastorello and Levon Aramyan and Maria Teresa Botticella and Morgan Fraser and Stefano Benetti and Stephen J. Smartt and Enrico Cappellaro and Nancy Elias-Rosa and Mattias Ergon and Lindsay Magill and Eugene Magnier and Rubina Kotak and Paul A. Price and Jesper Sollerman and Lina Tomasella and Massimo Turatto and Darryl Edmund Wright. - and INAF-Osservatorio Astronomico di Padova},
journal= {arXiv preprint arXiv:1203.1933},
year = {2015}
}
Comments
3 Figures - 2 Tables - Accepted for publication in ApJL