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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 ...
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.
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.
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 J1228+1040, a white dwarf with a disk of debris. ZTF J203349.8+322901.1 , a white dwarf with one side made up of hydrogen and the other of helium, nicknamed Janus [ 25 ] [ 26 ] References
SDSS 1557 (SDSS J155720.77+091624.6, WD 1554+094) is a binary system composed of a white dwarf and a brown dwarf.The system is surrounded by a circumbinary debris disk.The debris disk was formed when a minor planet was tidally disrupted around the white dwarf in the past.
WD 2317+1830 was first discovered in 2021 from Gaia and SDSS data as a candidate white dwarf. [9] A first spectral analysis was published in 2020, identifying it as a DZ white dwarf. [1] In 2021 observations with the Gran Telescopio Canarias were published. The white dwarf is massive and has a mass of 1.00 ± 0.02 M ☉.
YZ Leonis Minoris is made up of a white dwarf star and a low-mass donor companion. The white dwarf accretes matter from the companion via a helium-rich accretion disk. [3] The disk around the white dwarf has a size ranging from 18,000 to 90,800 km, which is about 45% of the orbital separation of the components.