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This Black Hole Keeps Its Own White Dwarf ‘Pet’

13 Mar 2017, 20:19 UTC
This Black Hole Keeps Its Own White Dwarf ‘Pet’
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The most compact star-black hole binary has been discovered, but the star seems to be perfectly happy whirling around the massive singularity twice an hour.
Credits: X-ray: NASA/CXC/University of Alberta/A.Bahramian et al.; Illustration: NASA/CXC/M.Weiss
A star in the globular cluster of 47 Tucanae is living on the edge of oblivion.
Located near a stellar-mass black hole at only 2.5 times the Earth-moon distance, the white dwarf appears to be in a stable orbit, but it’s still paying the price for being so intimate with its gravitational master. As observed by NASA’s Chandra X-ray Observatory and NuSTAR space telescope, plus the Australia Telescope Compact Array, gas is being pulled from the white dwarf, which then spirals into the black hole’s super-heated accretion disk.
47 Tucanae is located in our galaxy, around 14,800 light-years from Earth.
Eventually, the white dwarf will become so depleted of plasma that it will turn into some kind of exotic planetary-mass body or it will simply evaporate away. But one thing does appear certain, the white dwarf will remain in orbit and isn’t likely to get swallowed by the black hole whole any time soon.
“This white dwarf is so close to the black hole that ...

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