Tidal fragmentation as the origin of 1I/2017 U1 (‘Oumuamua)

  title={Tidal fragmentation as the origin of 1I/2017 U1 (‘Oumuamua)},
  author={Yun Zhang and Douglas N. C. Lin},
  journal={Nature Astronomy},
The first discovered interstellar object (ISO), ‘Oumuamua (1I/2017 U1) shows a dry and rocky surface, an unusually elongated shape, with short-to-long axis ratio c ∕ a  ≲ 1∕6, a low velocity relative to the local standard of rest (~10 km s −1 ), non-gravitational accelerations and tumbles on a timescale of a few hours 1 – 9 . The inferred number density (~3.5 × 10 13 −2 × 10 15  pc −3 ) for a population of asteroidal ISOs 10 , 11 outnumbers cometary ISOs 12 by ≥10 3 , in contrast to the much… 

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