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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 ...
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.
About 6% of white dwarfs show infrared excess due to a disk around a white dwarf. [68] In the past only a relative small sample of white dwarf disks was known. [69] 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.
Sirius B, which is a white dwarf, can be seen as a faint point of light to the lower left of the much brighter Sirius A. A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: in an Earth sized volume, it packs a mass that is comparable to the Sun.
The Daily Observer [3] hit the stands in Bangladesh on 1 February 2011. [4] [5] Iqbal Sobhan Chowdhury, [6] the last editor of Bangladesh Observer, [7] started the circulation of a new newspaper by the name of The Daily Observer in 2011. The editor was sued by MP Nizam Uddin Hazari in 2017 for publishing an allegedly defamatory article ...
Of the seven musk deer species in the world, six are found in China and five are endangered: the Anhui musk deer and dwarf musk deer of central China, the alpine musk deer of western China, the white-bellied musk deer and black musk deer of Tibet. The Siberian musk deer in the northeast is considered vulnerable. The lesser mouse-deer is found ...
Like other white dwarfs, it is a very dense star: its mass has been estimated to be about 67% of the Sun's, [28] yet it has only 1% of the Sun's radius (1.23 times the Earth's radius) [8] [a] The outer atmosphere has a temperature of approximately 6,110 K, [28] which is relatively cool for a white dwarf. As all white dwarfs steadily radiate ...
GD 362 is a white dwarf approximately 150 light years from Earth. [5] In 2004, spectroscopic observations showed that it had a relatively high concentration of metals in its atmosphere . Since the high gravitational field of white dwarfs quickly forces heavy elements to settle towards the bottom of the atmosphere, this meant that the atmosphere ...