Fastest-spinning brown-dwarf star detected

Astronomers have detected what may be the most rapidly rotating, ultra-cool, brown-dwarf star ever seen. The super-fast rotation period was measured by using the 305-meter Arecibo radio telescope -- the same telescope that was used to discover the first planets ever found outside our solar system. The detection emphasizes Arecibo's amazing sensitivity, which has the potential to measure the magnetic fields, which protect life, of potentially habitable planets around other stars.
The new detection of an ultra-cool dwarf emphasizes Arecibo's amazing sensitivity, which enables measurements of the magnetic fields of very-low-mass stars, brown dwarfs, and potentially planets. Because planetary magnetic fields protect life from the harmful effects of stellar activity, it is clear that future programs of this kind using the Arecibo telescope will be crucial to our understanding of the habitability of planets around other stars.

https://www.sciencedaily.com/releases/2016/06/160627095023.htm