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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 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.
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 .
The difference in the shape of the light curves is believed to be caused, in the case of Type II-L supernovae, by the expulsion of most of the hydrogen envelope of the progenitor star. [29] The plateau phase in Type II-P supernovae is due to a change in the opacity of the exterior layer.
Supernova nucleosynthesis is the nucleosynthesis of chemical elements in supernova explosions.. In sufficiently massive stars, the nucleosynthesis by fusion of lighter elements into heavier ones occurs during sequential hydrostatic burning processes called helium burning, carbon burning, oxygen burning, and silicon burning, in which the byproducts of one nuclear fuel become, after ...
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[21] [22] He published his observations in the small book De nova et nullius aevi memoria prius visa stella (Latin for "Concerning the new and previously unseen star") in 1573. It is from the title of this book that the modern word nova for cataclysmic variable stars is derived. [23] Multiwavelength X-ray image of the remnant of Kepler's ...