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The metal-rich white dwarf WD 1145+017 is the first white dwarf observed with a disintegrating minor planet that transits the star. [176] [177] The disintegration of the planetesimal generates a debris cloud that passes in front of the star every 4.5 hours, causing a 5-minute-long fade in the star's optical brightness. [177]
In 2009 it was discovered that this white dwarf has an anomalous high hydrogen content. This could come from the accretion of a water-rich body with a mass between Callisto and Mars. [10] The origin of the high amount of hydrogen is however still up for debate. [11] [12] GD 362 has been a white dwarf for approximately 900 million years. [13]
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
[85] one of the first detection of lithium and potassium in a white dwarf, similar discoveries at the same time WD 2317+1830: 4,210 or 4,557 primitive planetesimal [86] yes Li, Na, Ca 2021 [87] Coldest and oldest (9.5 Gyrs) white dwarf with a detected disk. Also one of the most massive white dwarfs with a disk.
AR Scorpii is the first "white dwarf-pulsar" to be discovered. [7] Its unusual nature was first noticed by amateur astronomers. [ 8 ] The 3.56-hour period in AR Scorpii's light curve caused it to be misclassified as a Delta Scuti variable , but in 2016, this period was found to be the binary orbital period.
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 “dwarf”-like animal was discovered on a ... The male gecko has an orange-yellow body and striped black and white tail. ... Painted dwarf geckos are most active during the day and were not ...
In 2016, a white dwarf in the binary system AR Scorpii was identified as a pulsar [32] [33] (it is often mistakenly called the first discovered pulsar-like white dwarf). The system displays strong pulsations from ultraviolet to radio wavelengths, powered by the spin-down of the strongly magnetized white dwarf. [32]