A micronova is a type of thermonuclear explosion on the surface of a white dwarf much smaller than the strength of a nova; being about 1×1039 ergs (1.0×10−12 foe; 1.0×1032 J) in strength, about a millionth that of a typical nova. The phenomenon was first described in April 2022.
A team led by Durham University researchers announced on 20 April 2022 that they identified three micronovae using data from the Transiting Exoplanet Survey Satellite (TESS).
The phenomenon had previously been observed in the white dwarf binary TV Columbae using data from the International Ultraviolet Explorer. However the data was not sufficient to infer the physical mechanism behind the explosion.