Final answer:
The formation of a new white dwarf is usually accompanied by an explosion resulting from sudden and explosive fusion triggered by the white dwarf reaching its mass limit.
Step-by-step explanation:
The formation of a new white dwarf is usually accompanied by an explosion. When a white dwarf accumulates matter from a companion star at a much faster rate and its mass exceeds the Chandrasekhar limit, it can no longer support itself as a white dwarf and begins to contract. This contraction heats up the white dwarf and triggers new nuclear reactions, resulting in a sudden and explosive fusion event.
The formation of a new white dwarf is usually accompanied by novae resulting from the sudden ignition of accumulated hydrogen or, in cases where the mass exceeds the Chandrasekhar limit, a type Ia supernova that completely destroys the white dwarf.
The formation of a new white dwarf is usually accompanied by explosive events such as a nova or, under certain conditions, a type Ia supernova. When a white dwarf, which is the remnant of a star that has exhausted its nuclear fuel, finds itself in a binary system with a companion star, it can acquire additional mass from its partner. Upon gradually accumulating hydrogen onto its surface, a nova can occur due to sudden hydrogen fusion. If the accumulation is rapid and substantial, the white dwarf may approach or exceed the Chandrasekhar limit, triggering a catastrophic type Ia supernova. In some cases, the merger of two white dwarfs in a binary system can also result in a type Ia supernova if their combined mass is over the Chandrasekhar limit. A nova does not typically destroy the white dwarf, but a type Ia supernova explosion obliterates it completely, leaving no trace and spreading debris into space at high velocities.