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The fate of planetesimal discs in young open clusters: implications for 1I/'Oumuamua, the Kuiper belt, the Oort cloud and more

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journal contribution
posted on 23.04.2020, 15:20 by TO Hands, W Dehnen, A Gration, J Stadel, B Moore
We perform N-body simulations of the early phases of open cluster evolution including a large population of planetesimals, initially arranged in Kuiper-belt like discs around each star. Using a new, fourth-order, and time-reversible N-body code on Graphics Processing Units (GPUs), we evolve the whole system under the stellar gravity, i.e. treating planetesimals as test particles, and consider two types of initial cluster models, similar to IC348 and the Hyades, respectively. In both cases, planetesimals can be dynamically excited, transferred between stars, or liberated to become free-floating (such as A/2017 U1 or ’Oumuamua) during the early cluster evolution. We find that planetesimals captured from another star are not necessarily dynamically distinct from those native to a star. After an encounter, both native and captured planetesimals can exhibit aligned periastrons, qualitatively similar to that seen in the Solar system and commonly thought to be the signature of Planet 9. We discuss the implications of our results for both our Solar system and exoplanetary systems.

Funding

This research has made use of data and/or services provided by the International Astronomical Union’s Minor Planet Center. The authors would like to thank Simon Grimm and Richard Alexander for useful discussions, and the anonymous reviewer for comments which greatly improved the manuscript. TOH acknowledges support from the Swiss National Science Foundation grant number 200020_162930. This work has been carried out in the frame of the National Centre for Competence in Research ’PlanetS’ supported by the Swiss National Science Foundation (SNSF).

History

Citation

Monthly Notices of the Royal Astronomical Society, Volume 490, Issue 1, November 2019, Pages 21–36, https://doi.org/10.1093/mnras/stz1069

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

490

Issue

1

Pagination

21–36

Publisher

Oxford University Press (OUP), Royal Astronomical Society

eissn

1365-2966

Acceptance date

10/04/2019

Copyright date

2019

Available date

25/04/2019

Publisher version

https://academic.oup.com/mnras/article/490/1/21/5479887

Language

en