SN 2012cg: EVIDENCE FOR INTERACTION BETWEEN A NORMAL SN Ia AND A NON-DEGENERATE BINARY COMPANION Academic Article uri icon

abstract

  • 2016. The American Astronomical Society. All rights reserved.. We report evidence for excess blue light from the Type Ia supernova (Sn Ia) SN 2012cg at 15 and 16 days before maximum B-band brightness. The emission is consistent with predictions for the impact of the supernova on a non-degenerate binary companion. This is the first evidence for emission from a companion to a normal SN Ia. Sixteen days before maximum light, the color of SN 2012cg is 0.2 mag bluer than for other normal SN Ia. At later times, this supernova has a typical SN Ia light curve, with extinction-corrected mag and . Our data set is extensive, with photometry in seven filters from five independent sources. Early spectra also show the effects of blue light, and high-velocity features are observed at early times. Near maximum, the spectra are normal with a silicon velocity vSi = -10,500 km s-1. Comparing the early data with models by Kasen favors a main-sequence companion of about six solar masses. It is possible that many other SN Ia have main-sequence companions that have eluded detection because the emission from the impact is fleeting and faint.

published proceedings

  • The Astrophysical Journal

altmetric score

  • 169.26

author list (cited authors)

  • Marion, G. H., Brown, P. J., Vink, J., Silverman, J. M., Sand, D. J., Challis, P., ... Zheng, W.

citation count

  • 108

complete list of authors

  • Marion, GH||Brown, Peter J||Vink√≥, Jozsef||Silverman, Jeffrey M||Sand, David J||Challis, Peter||Kirshner, Robert P||Wheeler, J Craig||Berlind, Perry||Brown, Warren R||Calkins, Michael L||Camacho, Yssavo||Dhungana, Govinda||Foley, Ryan J||Friedman, Andrew S||Graham, Melissa L||Howell, D Andrew||Hsiao, Eric Y||Irwin, Jonathan M||Jha, Saurabh W||Kehoe, Robert||Macri, Lucas M||Maeda, Keiichi||Mandel, Kaisey||McCully, Curtis||Pandya, Viraj||Rines, Kenneth J||Wilhelmy, Steven||Zheng, Weikang

publication date

  • March 2016