What condition causes a Type Ia supernova to occur?

Answer

A white dwarf accumulating matter until it reaches the Chandrasekhar limit

Type Ia supernovae happen when a white dwarf star in a binary system accretes matter from its companion until it surpasses the critical Chandrasekhar mass limit, triggering a runaway thermonuclear explosion.

What condition causes a Type Ia supernova to occur?

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