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All previous disks around white dwarfs originate from rocky planetary bodies. The size of the disk around WD J0914+1914 was measured with the help of Doppler -broadbanded emission lines. The disk around the white dwarf is too large (~1-10 solar radii ) to be formed by a small minor planet, which was tidally disrupted inside the Roche Radius .
First discovered Sirius B: 1852 Sirius system Sirius B is also the nearest white dwarf (as of 2005) [2] [3] First found in a binary star system First double white dwarf system LDS 275: 1944 L 462-56 system [4] 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
A less common observable evidence is infrared excess due to a flat and optically thick debris disk, which is found in around 1%–4% of white dwarfs. [156] The first white dwarf with infrared excess was discovered by Zuckerman and Becklin in 1987 in the near-infrared around Giclas 29-38 [161] and later confirmed as a debris disk. [162]
This is evident from the pollution of the white dwarf atmosphere with metals, especially the pollution with nitrogen. WD 1425+540 is the first white dwarf with detected nitrogen. [5] [6] The white dwarf has a K-dwarf companion called G200-40, about 40 arcseconds away. [5] The white dwarf nature of the object was discovered by Greenstein in 1974 ...
The planet is in a circumbinary orbit around the two stars of PSR B1620-26 (which are a pulsar (PSR B1620-26 A) and a white dwarf (WD B1620-26)) and is the first circumbinary planet ever confirmed. It is also the first planet found in a globular cluster.
The supposed planetesimal, WD 1145+017 b, [13] with a 4.5 hour orbit, is being ripped apart by the star and is a remnant of the former planetary system that the star hosted before becoming a white dwarf. [8] [9] It is the first observation of a planetary object being shredded by a white dwarf. Several other large pieces have been seen in orbit ...
Dwarf planet (2006) Giuseppe Piazzi. He first announced his discovery on 24 January 1801, in letters to fellow astronomers. [27] The first formal publication was the September 1801 issue of the Monatliche Correspondenz. [28] 1840s o: 23 September 1846 p: 13 November 1846 Neptune: 13th Planet (1846) [a] 8th Planet (1851) Galle and Le Verrier [29 ...
Like other white dwarfs, it is a very dense star: its mass has been estimated to be about 67% of the Sun's, [27] yet it has only 1% of the Sun's radius (1.23 times the Earth's radius) [7] [a] The outer atmosphere has a temperature of approximately 6,110 K, [27] which is relatively cool for a white dwarf. As all white dwarfs steadily radiate ...