Where did 'Oumuamua come from?
Most likely: ejected from another star's planetary system during planet formation, like most interstellar objects should…Ahead on the evidence, not yet confirmed. It needs two reviews to be accepted.
Where it stands
Five answers have been proposed. Ejected from another star's planetary system during planet formation, like most interstellar objects should… leads, with evidence 1 for, 1 against: supported by its tests. Four are still possible. Of the one narrower question under it, none is answered yet.
Answers 5
History
- Bailer-Jones et al. puts forward: a specific nearby star is its home, such as HIP 3757 or HD 292249.
- Bailer-Jones et al.: four candidate encounters were found, the closest at 0.60 pc with HIP 3757 about a million years ago.For: A specific nearby star is its home, such as HIP 3757 or HD 292249.
- The 'Oumuamua ISSI Team et al. puts forward: ejected from another star's planetary system during planet formation, like most interstellar objects should…
- The 'Oumuamua ISSI Team et al.: the ISSI review explains every property by analogy with planetary-system evolution.For: Ejected from another star's planetary system during planet formation, like most interstellar objects should…
- Zhang & Lin puts forward: a shard torn from a larger body by tides during a close pass by its star, then ejected.
- Hallatt & Wiegert: carina and Columba are the most plausible source regions, though only statistically.For: Born in a young stellar association such as the Carina or Columba moving groups, tens of millions of years…
- Zhang & Lin: simulations produce axis ratios below 1:10 with baked surfaces and buried water.For: A shard torn from a larger body by tides during a close pass by its star, then ejected.
- Hallatt & Wiegert: galactic scattering limits traceback accuracy to about 15 pc at 10 million years.Against: A specific nearby star is its home, such as HIP 3757 or HD 292249.
- Hsieh et al. puts forward: born in a young stellar association such as the Carina or Columba moving groups, tens of millions of years…
- Hsieh et al.: the implied number of such bodies is in tension with ejection from protostellar discs in the candidate source…Against: Ejected from another star's planetary system during planet formation, like most interstellar objects should…
- Hsieh et al.: the orbit is consistent with Carina-group membership and a dynamical age of about 35 million years.For: Born in a young stellar association such as the Carina or Columba moving groups, tens of millions of years…
- Zheng & Zhou: about 3 per cent of objects ejected from a single giant-planet system would be extremely elongated.For: A shard torn from a larger body by tides during a close pass by its star, then ejected.
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