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Artist's conception of a white dwarf, right, accreting hydrogen from the Roche lobe of its larger companion star A nova (pl. novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star (hence the name "nova", Latin for "new") that slowly fades over weeks or months.
The following is a list of all novae that are known to have occurred in 2019. A nova is an energetic astronomical event caused by a white dwarf accreting matter from a star it is orbiting (typically a red giant, whose outer layers are more weakly attached than smaller, denser stars) Alternatively, novae can be caused by a pair of stars merging with each other, however such events are vastly ...
Artist's impression of neutron stars merging, producing gravitational waves and resulting in a kilonova Kilonova illustration. A kilonova (also called a macronova) is a transient astronomical event that occurs in a compact binary system when two neutron stars or a neutron star and a black hole merge. [1]
Details of the pre-nova moments may help scientists better judge the quality of Type Ia supernovae as standard candles, which is an important link in the argument for dark energy. [ 46 ] In July 2019, the Hubble Space Telescope took three images of a Type Ia supernova through a gravitational lens .
Novae are initially designated via a "Nova [genitive form of constellation name] [year of discovery]" format, e.g. "Nova Cygni 1974" and "Nova Scorpii 2010". An official permanent name is usually soon assigned by the General Catalog of Variable Stars using the GCVS format for the naming of variable stars. When more than one nova is discovered ...
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The heavy elements are produced by: nuclear fusion for nuclei up to 34 S; silicon photodisintegration rearrangement and quasiequilibrium during silicon burning for nuclei between 36 Ar and 56 Ni; and rapid capture of neutrons during the supernova's collapse for elements heavier than iron.