A hybrid type Ia supernova with an early flash triggered by helium-shell detonation
Type Ia supernovae arise from the thermonuclear explosion of white-dwarf stars that have cores of carbon and oxygen. The uniformity of their light curves makes these supernovae powerful cosmological distance indicators, but there have long been debates about exactly how their explosion is triggered and what kind of companion stars are involved. For
Jiang, Ji-An et al.
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2017