The Luminous and Carbon-Rich Supernova 2006gz: A Double Degenerate Merger?

Details The Luminous and Carbon-Rich Supernova 2006gz: A Double Degenerate Merger? The Luminous and Carbon-Rich Supernova 2006gz: A Double Degenerate Merger?

2007-09-11

arxiv.org/abs/0709.1501v1

Astrophys.J. 669:L17-L20,2007

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJL (5 pages, 4 figures). UBVr'i' light curves, UVOIR light curves, and spectra available at ht

Scientific paper

10.1086/523301

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 (Delta m_15 = 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 M_V = -19.74 and the production of ~ 1.2 M_sun of 56Ni. This suggests a super-Chandrasekhar mass progenitor. A double degenerate merger is consistent with these observations.

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