The origin of interstellar asteroidal objects like 1I/2017 U1

@inproceedings{Zwart2017TheOO,
  title={The origin of interstellar asteroidal objects like 1I/2017 U1},
  author={Simon Portegies Zwart and Santiago Torres and Inti Pelupessy and Jeroen B{\'e}dorf and Maxwell Cai Leiden Observatory and NleSC},
  year={2017}
}
With the recently discovered interstellar object 1I/2017U1 (1I/'Oumuamua) we have to realize that the Solar System is not isolated, but part of a larger environment with which we interact. We compare the kinematics of 1I/2017U1 with simulations of the Milky Way Galaxy and Gaia TGAS data to estimates the local density of objects similar to 1I/2017U1 and to investigate its possible origin. We find that about 1.3\,Myr ago 1I/2017U1 has passed within a distance of $0.16$\,pc from the nearby star… 

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