Context. The origin of subluminous Type Ia supernovae (SNe Ia) has long eluded any explanation, because all Chandrasekhar-mass models have severe problems reproducing them. Recently, it has been proposed that violent mergers of two white dwarfs of 0.9 M⊙ could lead to subluminous SNe Ia events that resemble 1991bg-like SNe Ia.
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Pakmor et al. (2011) studied this question.
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