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|a Marion, G. H.
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|a Massachusetts Institute of Technology. Center for Theoretical Physics
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|a Massachusetts Institute of Technology. Department of Physics
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|a Massachusetts Institute of Technology. Program in Science, Technology and Society
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|a Friedman, Andrew Samuel
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|a Brown, Peter J.
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|a Vinkó, Jozsef
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|a Silverman, Jeffrey M.
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|a Sand, David J.
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|a Challis, Peter
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|a Kirshner, Robert P.
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|a Wheeler, J. Craig
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|a Berlind, Perry
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|a Brown, Warren R.
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|a Calkins, Michael L.
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|a Camacho, Yssavo
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|a Dhungana, Govinda
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|a Foley, Ryan J.
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|a Graham, Melissa L.
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|a Howell, D. Andrew
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|a Hsiao, Eric Y.
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|a Irwin, Jonathan M.
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|a Jha, Saurabh W.
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|a Kehoe, Robert
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|a Macri, Lucas M.
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|a Maeda, Keiichi
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|a Mandel, Kaisey
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|a McCully, Curtis
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|a Pandya, Viraj
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|a Rines, Kenneth J.
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|a Wilhelmy, Steven
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|a Zheng, Weikang
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|a Friedman, Andrew Samuel
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|a SN 2012cg: EVIDENCE FOR INTERACTION BETWEEN A NORMAL SN Ia AND A NON-DEGENERATE BINARY COMPANION
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|b IOP Publishing,
|c 2017-06-01T19:55:30Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/109517
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|a 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.
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|a National Science Foundation (U.S.). Graduate Research Fellowship Program
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|a United States. National Aeronautics and Space Administration (Graduate Research Program Fellowship)
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|a National Science Foundation (U.S.). Division of Social and Economic Sciences (award SES-1056580)
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|a en_US
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|a Article
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|t Astrophysical Journal
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