What is the approximate mass limit that a white dwarf must breach via accretion to trigger a Type Ia event?
Answer
Approximately 1.4 times the mass of the Sun.
The critical mass threshold that triggers the thermonuclear runaway in a white dwarf is known as the Chandrasekhar limit, which is about 1.4 times the mass of the Sun. Breaching this limit leads directly to the explosion.

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