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Title:
The Luminous and Carbon-rich Supernova 2006gz: A Double Degenerate Merger?
Authors:
Hicken, M.; Garnavich, P. M.; Prieto, J. L.; Blondin, S.; DePoy, D. L.; Kirshner, R. P.; Parrent, J.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138; , , .), AB(Department of Physics, University of Notre Dame, Notre Dame, IN 46556; .), AC(Department of Astronomy, The Ohio State University, Columbus, OH 43210; , .), AD(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138; , , .), AE(Department of Astronomy, The Ohio State University, Columbus, OH 43210; , .), AF(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138; , , .), AG(Department of Physics and Astronomy, University of Oklahoma, Norman, OK 73019; .)
Publication:
The Astrophysical Journal, Volume 669, Issue 1, pp. L17-L20. (ApJ Homepage)
Publication Date:
11/2007
Origin:
UCP
ApJ Keywords:
Stars: Supernovae: General, supernovae: individual (SN 2006gz)
DOI:
10.1086/523301
Bibliographic Code:
2007ApJ...669L..17H

Abstract

Spectra and light curves of SN 2006gz show the strongest signature of unburned carbon and one of the slowest fading light curves ever seen in a Type Ia event [Δm15(B)=0.69+/-0.04]. The early-time Si II velocity is low, implying it was slowed by an envelope of unburned material. Our best estimate of the luminosity implies MV=-19.74 and the production of ~1.2 Msolar of 56Ni. This suggests a super-Chandrasekhar mass progenitor. A double degenerate merger is consistent with these observations.
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