SN 2012cg: EVIDENCE FOR INTERACTION BETWEEN A NORMAL SN Ia AND A NON-DEGENERATE BINARY COMPANION
Name
Marion-2016-SN 2012cg_ EVIDENCE.pdf
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2.05 MB
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Adobe PDF
Checksum (MD5)
4219a1db89b114ae71eacc3fa0a3d03b
Author(s)
Marion, G. H.
Brown, Peter J.
Vinkó, Jozsef
Silverman, Jeffrey M.
Sand, David J.
Challis, Peter
Kirshner, Robert P.
Wheeler, J. Craig
Berlind, Perry
Brown, Warren R.
Date Issued
June 1, 2017
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Marion, G. H., Peter J. Brown, Jozsef Vinkó, Jeffrey M. Silverman, David J. Sand, Peter Challis, Robert P. Kirshner, et al. “SN 2012cg: EVIDENCE FOR INTERACTION BETWEEN A NORMAL SN Ia AND A NON-DEGENERATE BINARY COMPANION.” The Astrophysical Journal 820, no. 2 (March 23, 2016): 92. © 2016 The American Astronomical Society
Version
Final published version
Abstract
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 B - V 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 M[subscript B] =- 19.62 ± 0.02 mag and Δm[subscript 15(B) = 0.86 ± 0.02. 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[subscript Si] = −10,500 km s[superscript −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.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Program in Science, Technology and Society
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DOI of Published Version
https://doi.org/10.3847/0004-637X/820/2/92
