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Sub-luminous type Ia supernovae from the mergers of equal-mass white dwarfs with mass approximately 0.9M[symbol: see text].

Abstract：

:Type Ia supernovae are thought to result from thermonuclear explosions of carbon-oxygen white dwarf stars. Existing models generally explain the observed properties, with the exception of the sub-luminous 1991bg-like supernovae. It has long been suspected that the merger of two white dwarfs could give rise to a type Ia event, but hitherto simulations have failed to produce an explosion. Here we report a simulation of the merger of two equal-mass white dwarfs that leads to a sub-luminous explosion, although at the expense of requiring a single common-envelope phase, and component masses of approximately 0.9M[symbol: see text]. The light curve is too broad, but the synthesized spectra, red colour and low expansion velocities are all close to what is observed for sub-luminous 1991bg-like events. Although the mass ratios can be slightly less than one and still produce a sub-luminous event, the masses have to be in the range 0.83M[symbol: see text] to 0.9M[symbol: see text].

journal_name

Nature

journal_title

Nature

authors

Pakmor R,Kromer M,Röpke FK,Sim SA,Ruiter AJ,Hillebrandt W

doi

10.1038/nature08642

subject

Has Abstract

pub_date

2010-01-07 00:00:00

pages

61-4

issue

7277

eissn

0028-0836

issn

1476-4687

pii

nature08642

journal_volume

463

pub_type

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