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Extreme Brown Dwarfs Found Spinning at Their Physical Limits

Image: NOIRLab/NSF/AURA/J. da Silva
New research documents the fastest-spinning brown dwarfs on record. The objects are rotating so rapidly that, should they rotate any faster, they’d likely tear themselves apart. The finding could mean that these so-called “failed stars” have a built-in speed limit.
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The three brown dwarfs are spinning 10 times faster than Jupiter, completing a single rotation around their axes once every hour. That’s about 30% faster than the fastest spinning brown dwarfs on record, according to the new paper, which is set to appear in an upcoming issue of the Astronomical Journal (a preprint is currently available at the arXiv). ....

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Scientists discover record-breaking 'failed stars' that are nearly tearing themselves apart

Scientists discover record-breaking ‘failed stars’ that are nearly tearing themselves apart
Adam Smith
© Provided by The Independent
Astronomers have found the fastest brown dwarf stars in the known universe, spinning at such a rapid rate that they risk ripping themselves asunder.
A brown dwarf, otherwise known as a ‘failed star’, are formed when stars cannot gather enough mass to trigger nuclear reactions, which would convert their cores from hydrogen into helium.
“We seem to have come across a speed limit on the rotation of brown dwarfs,” said Megan Tannock, the Western University physics and astronomy graduate student who led the discovery. ....

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Caught speeding: Clocking the fastest-spinning brown dwarfs

VIDEO: CosmoView Episode 25: Caught Speeding: Clocking the Fastest-Spinning Brown Dwarfs
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Credit: Images and Videos: International Gemini Observatory/NOIRLab/NSF/AURA/J. da Silva, P. Marenfeld, NASA/JPL-Caltech, R. Hurt (IPAC).
Music: zero-project - The Lower Dungeons (zero-project.gr).
Astronomers at Western University have discovered the most rapidly rotating brown dwarfs known. They found three brown dwarfs that each complete a full rotation roughly once every hour. That rate is so extreme that if these failed stars rotated any faster, they could come close to tearing themselves apart. Identified by NASA s Spitzer Space Telescope, the brown dwarfs were then studied by ground-based telescopes including Gemini North, which confirmed their surprisingly speedy rotation. ....

United States , University Of Arizona , Mauna Kea , Ames Research Center , Western University , Kitt Peak National Observatory , San Diego , South Korea , Genaro Su , Sandy Leggett , Stanimir Metchev , Verac Rubin , Cerro Pach , Marks Marley , Iolkam Duag Kitt , Jonathan Gagn , Amanda Kocz , Megan Tannock , Cerro Tololo , Tinto Alcan , Astronomy Research Laboratory , Apai University Of Arizona , Megan Tannock Western University , Data Center , Nsf Noirlab National Optical , Adam Burgasser University Of California ,

'Failed stars' may have a cosmic speed limit to how fast they can spin — otherwise they'll break apart

'Failed stars' may have a cosmic speed limit to how fast they can spin — otherwise they'll break apart
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Megan Tannock , National Aeronautics , Space Administration , Milky Way , Astronomical Journal , தேசிய வான்செலவுத்துறை , பால் வழி , வானியல் இதழ் ,

Fast-Spinning Brown Dwarfs May Reveal a Rotational Speed Limit – Exoplanet Exploration: Planets Beyond our Solar System

With so much variety among the brown dwarf speeds already measured, it surprised the authors of the new study that the three fastest brown dwarfs ever found have almost the exact same spin rate (about one full rotation per hour) as each other. This cannot be attributed to the brown dwarfs having formed together or being at the same stage in their development, as they are physically different: One is a warm brown dwarf, one is cold, and the other falls between them. Since brown dwarfs cool as they age, the temperature differences suggest these brown dwarfs are different ages. ....

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