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WD 1145+017 (also known as EPIC 201563164 [5]) is a white dwarf approximately 476 light-years (146 parsecs) from Earth in the constellation of Virgo. It is the first white dwarf to be observed with a transiting minor planet orbiting it.
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: its mass is comparable to the Sun's, while its volume is comparable to Earth's.
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 [5] [6] First singular white dwarf with a planet WD 1145+017: 2015 WD 1145+017 b: Planet is extremely small and is disintegrating. First white dwarf that is a pulsar: AR Scorpii A ...
The planetary object orbits a white dwarf.It has ended its main sequence lifetime and will continue to cool for billions of years to come in the future. Based on recent studies and its mass, the star was likely an early A-type main sequence star with a mass of 2.46 M ☉ and main sequence lifetime of 550 million years before it expanded and became a red giant. [5]
Eddington predicted that dwarf stars remain in an essentially static position on the main sequence for most of their lives. In the 1930s and 1940s, with an understanding of hydrogen fusion, came an evidence-backed theory of evolution to red giants following which were speculated cases of explosion and implosion of the remnants to white dwarfs.
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 ...
Like all white dwarfs, it is incredibly dense, packing about 70% of the sun's mass into an Earth-sized object. Stars with up to eight times the mass of our sun appear destined to end up as a white ...
G 240-72 has mass 0.81 Solar masses [2] and surface gravity 10 8.36 (2.29 · 10 8) cm·s −2, [2] or approximately 234 000 of Earth's, corresponding to a radius 6850 km, or 107% of Earth's. This white dwarf has relatively low temperature 5590 K [2] (slightly cooler than the Sun), and old cooling age, i. e. age as degenerate star (not counting ...