When a white dwarf star is totally annihilated by a nuclear explosion, type Ia supernovae are produced. Type Iax supernovae, a new subtype of supernova, have just been discovered.
<h3>Why do Type 1a supernovae occur?</h3>
It is believed that Type Ia supernovae (SNIa) are produced when a carbon-oxygen white dwarf in a binary system reaches the Chandrasehkar limit, either as a result of accretion from a donor or mergers.
Supernovae of type 1a, in which one of the stars is a white dwarf and there are two stars circling one another, are a kind of supernova that may occur in binary systems. The other star might range in size from a massive star to a tiny white dwarf.
The other star may be anything, even a huge one.
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