What critical mass boundary, if exceeded by a remnant core, leads to catastrophic collapse instead of a white dwarf formation?

Answer

Chandrasekhar Limit

If the remnant core's mass exceeds approximately 1.4 times the Sun's mass, the electron degeneracy pressure fails, resulting in a catastrophic collapse, often leading to a Type Ia supernova.

What critical mass boundary, if exceeded by a remnant core, leads to catastrophic collapse instead of a white dwarf formation?
starstellar evolutionastrophysicsdwarf star