Was Planet 9 captured in the Sun’s natal star-forming region?

@article{Parker2017WasP9,
  title={Was Planet 9 captured in the Sun’s natal star-forming region?},
  author={Richard J. Parker and Tim Lichtenberg and Sascha P. Quanz},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2017},
  volume={472}
}
The presence of an unseen ‘Planet 9’ on the outskirts of the Solar system has been invoked to explain the unexpected clustering of the orbits of several Edgeworth–Kuiper Belt Objects. We use N-body simulations to investigate the probability that Planet 9 was a free-floating planet (FFLOP) that was captured by the Sun in its birth star formation environment. We find that only 1–6 per cent of FFLOPs are ensnared by stars, even with the most optimal initial conditions for capture in star… Expand

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