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SDSS J1228+1040 b is a disputed [4] extrasolar planetesimal orbiting the white dwarf SDSS J1228+1040. It was discovered in 2019 using the variable calcium Ca II emission line. [2] Unlike other planetesimals around white dwarfs, the planetesimal SDSS J1228+1040 b needs high internal strength and a high density to not be tidally disrupted.
SDSS J1228+1040 (SDSS J122859.93+104032.9, WD 1226+110) is a white dwarf with a debris disk around it. The disk formed when a planetary body was tidally disrupted around the white dwarf. It is the first gaseous disk discovered around a white dwarf. [2] SDSS J1228+1040 was first identified as a white dwarf in 2006 from SDSS spectroscopic data ...
About 6% of white dwarfs show infrared excess due to a disk around a white dwarf. [67] In the past only a relative small sample of white dwarf disks was known. [68] Due to advances in white dwarf detection (e.g. with Gaia or LAMOST) and improvement of WISE infrared catalogs with unWISE/CatWISE, the number has increased to hundreds of candidates.
SDSS J1240+6710 or SDSS J124043.01+671034.68, nicknamed Dox by its discoverers, [1] is a white dwarf in the constellation Draco. It was discovered by Kepler de Souza Oliveira, Detlev Koester and Gustavo Ourique. [2] [1] [3] It is unusual for having an atmosphere of almost pure oxygen.
First solitary white dwarf Van Maanen 2: 1917 Van Maanen's star is also the nearest solitary white dwarf [5] 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 [6] [7] First singular white dwarf with a transiting object WD 1145+017 ...
The researchers estimated that the white dwarf is orbiting the black hole at about 5% the distance that separates Earth from the sun, or a bit under 5 million miles (8 million km).