Authors
GH Marion, Peter J Brown, Jozsef Vinkó, Jeffrey M Silverman, David J Sand, Peter Challis, Robert P Kirshner, J Craig Wheeler, Perry Berlind, Warren R Brown, Michael L Calkins, Yssavo Camacho, Govinda Dhungana, Ryan J Foley, Andrew S Friedman, Melissa L Graham, D Andrew Howell, Eric Y Hsiao, Jonathan M Irwin, Saurabh W Jha, Robert Kehoe, Lucas M Macri, Keiichi Maeda, Kaisey Mandel, Curtis McCully, Viraj Pandya, Kenneth J Rines, Steven Wilhelmy, Weikang Zheng
Publication date
2016/3/22
Journal
The Astrophysical Journal
Volume
820
Issue
2
Pages
92
Publisher
IOP Publishing
Description
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 v Si=− 10,500 km s− 1. Comparing the early data with models by Kasen favors a main …
Scholar articles
GH Marion, PJ Brown, J Vinkó, JM Silverman, DJ Sand… - The Astrophysical Journal, 2016