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Possible Planet Orbiting the White Dwarf PG 0010+280

25 Dec 2015, 22:00 UTC
Possible Planet Orbiting the White Dwarf PG 0010+280
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PG 0010+280 is a young white dwarf with an estimated surface temperature of 27,220 K and a cooling age of approximately 16 million years. This object is the dense leftover core of what was once a star with roughly 1.8 times the mass of the Sun and with a main sequence lifetime of about 2.3 billion years. PG 0010+280 is estimated to have 57 percent the mass of the Sun and a diameter of roughly 20,000 km (~1.6 times the diameter of Earth).Observations of PG 0010+280 reveal an infrared excess at the 3 to 8 μm waveband. This infrared excess can be attributed to the presence of either an opaque dusty disk orbiting the white dwarf within its tidal radius or a blackbody with a temperature of roughly 1,300 K. If the infrared excess is due to the presence of an opaque dusty disk, the inner edge of such a disk can be as close as ~380,000 km from the white dwarf. Any closer than that, the intense radiation from the white dwarf can sublimate the dust grains.If the infrared excess is due to a ~1,300 K blackbody, such an object will have to be about 1.3 times the diameter ...

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