A white dwarf can go supernova under certain conditions, such as when it reaches the Chandrasekhar limit. This limit is the maximum mass a white dwarf can have before it undergoes a catastrophic collapse. If the white dwarf accretes enough mass from a companion star or merges with another white dwarf, its mass can exceed the Chandrasekhar limit. This excess mass causes the white dwarf to collapse inward, triggering a runaway nuclear fusion reaction. This explosion, known as a Type Ia supernova, releases a tremendous amount of energy and completely destroys the white dwarf star.
