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White dwarf - Wikipedia
The white dwarf has a mass of 0.6 M ☉, radius of 0.012 R ☉ (1.34 R 🜨) and a temperature of 15,020 K, typical for white dwarf stars. It has been a white dwarf for 224 million years. [6] [10] The star's spectrum includes strong absorption lines due to magnesium, aluminium, silicon, calcium, iron and nickel.
GD 358 is a variable white dwarf star of the DBV type. Like other pulsating white dwarfs, its variability arises from non-radial gravity wave pulsations within the star itself. [8] GD 358 was discovered during the 1958–1970 Lowell Observatory survey for high proper motion stars in the Northern Hemisphere. [9]
First white dwarf with a planet WD B1620−26: 2003 PSR B1620-26 b (planet) This planet is a circumbinary planet, which circles both stars in the PSR B1620-26 system [5] [6] First singular white dwarf with a planet WD 1145+017: 2015 WD 1145+017 b: Planet is extremely small and is disintegrating. First white dwarf that is a pulsar: AR Scorpii A ...
Indeed, this star is the prototype (archetype in practice) for DZ white dwarfs. Physical models of white dwarfs used by today's astrophysicists show that elements with mass greater than helium would sink, all things being equal, below the photosphere, leaving hydrogen and helium to be visible in the spectrum; for heavier elements to appear here ...
ZTF J0139+5245 (also known as J0139 and ZTF J013906.17+524536.89) is a white dwarf star approximately 564 light-years (172.9 pc) from Earth in the constellation of Perseus. [ 1 ] [ 2 ] It is the second white dwarf, after WD 1145+017 , to be observed with transits indicative of orbiting planetary material.
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Like other young, hot white dwarfs, G29-38 is thought to have formed relatively recently (600 million years ago) from its AGB progenitor, and therefore the excess was naturally explained by emission from a Jupiter-like brown dwarf with a temperature of 1200 K and a radius of 0.15 solar radius.
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