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Close encounters in young stellar clusters: implications for planetary systems in the solar neighbourhood

Malmberg, Daniel LU ; De Angeli, Francesca; Davies, Melvyn B LU ; Church, Ross P; Mackey, Dougal and Wilkinson, Mark I. (2007) In Monthly Notices of the Royal Astronomical Society 378(3). p.1207-1216
Abstract
The stars that populate the solar neighbourhood were formed in stellar clusters. Through N-body simulations of these clusters, we measure the rate of close encounters between stars. By monitoring the interaction histories of each star, we investigate the singleton fraction in the solar neighbourhood. A singleton is a star which formed as a single star, has never experienced any close encounters with other stars or binaries, or undergone an exchange encounter with a binary. We find that, of the stars which formed as single stars, a significant fraction is not singletons once the clusters have dispersed. If some of these stars had planetary systems, with properties similar to those of the Solar System, the planets' orbits may have been... (More)
The stars that populate the solar neighbourhood were formed in stellar clusters. Through N-body simulations of these clusters, we measure the rate of close encounters between stars. By monitoring the interaction histories of each star, we investigate the singleton fraction in the solar neighbourhood. A singleton is a star which formed as a single star, has never experienced any close encounters with other stars or binaries, or undergone an exchange encounter with a binary. We find that, of the stars which formed as single stars, a significant fraction is not singletons once the clusters have dispersed. If some of these stars had planetary systems, with properties similar to those of the Solar System, the planets' orbits may have been perturbed by the effects of close encounters with other stars or the effects of a companion star within a binary. Such perturbations can lead to strong planet-planet interactions which eject several planets, leaving the remaining planets on eccentric orbits. Some of the single stars exchange into binaries. Most of these binaries are broken up via subsequent interactions within the cluster, but some remain intact beyond the lifetime of the cluster. The properties of these binaries are similar to those of the observed binary systems containing extrasolar planets. Thus, dynamical processes in young stellar clusters will alter significantly any population of Solar System-like planetary systems. In addition, beginning with a population of planetary systems exactly resembling the Solar System around single stars, dynamical encounters in young stellar clusters may produce at least some of the extrasolar planetary systems observed in the solar neighbourhood. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
open clusters and associations : general, celestial mechanics, planetary, systems, stellar dynamics, binaries : general
in
Monthly Notices of the Royal Astronomical Society
volume
378
issue
3
pages
1207 - 1216
publisher
Wiley-Blackwell
external identifiers
  • wos:000248270400040
  • scopus:34250657898
ISSN
1365-2966
DOI
10.1111/j.1365-2966.2007.11885.x
language
English
LU publication?
yes
id
0a0d085a-3e70-4b89-a037-637179ad2eee (old id 691538)
date added to LUP
2007-12-18 10:03:49
date last changed
2017-07-30 03:32:35
@article{0a0d085a-3e70-4b89-a037-637179ad2eee,
  abstract     = {The stars that populate the solar neighbourhood were formed in stellar clusters. Through N-body simulations of these clusters, we measure the rate of close encounters between stars. By monitoring the interaction histories of each star, we investigate the singleton fraction in the solar neighbourhood. A singleton is a star which formed as a single star, has never experienced any close encounters with other stars or binaries, or undergone an exchange encounter with a binary. We find that, of the stars which formed as single stars, a significant fraction is not singletons once the clusters have dispersed. If some of these stars had planetary systems, with properties similar to those of the Solar System, the planets' orbits may have been perturbed by the effects of close encounters with other stars or the effects of a companion star within a binary. Such perturbations can lead to strong planet-planet interactions which eject several planets, leaving the remaining planets on eccentric orbits. Some of the single stars exchange into binaries. Most of these binaries are broken up via subsequent interactions within the cluster, but some remain intact beyond the lifetime of the cluster. The properties of these binaries are similar to those of the observed binary systems containing extrasolar planets. Thus, dynamical processes in young stellar clusters will alter significantly any population of Solar System-like planetary systems. In addition, beginning with a population of planetary systems exactly resembling the Solar System around single stars, dynamical encounters in young stellar clusters may produce at least some of the extrasolar planetary systems observed in the solar neighbourhood.},
  author       = {Malmberg, Daniel and De Angeli, Francesca and Davies, Melvyn B and Church, Ross P and Mackey, Dougal and Wilkinson, Mark I.},
  issn         = {1365-2966},
  keyword      = {open clusters and associations : general,celestial mechanics,planetary,systems,stellar dynamics,binaries : general},
  language     = {eng},
  number       = {3},
  pages        = {1207--1216},
  publisher    = {Wiley-Blackwell},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {Close encounters in young stellar clusters: implications for planetary systems in the solar neighbourhood},
  url          = {http://dx.doi.org/10.1111/j.1365-2966.2007.11885.x},
  volume       = {378},
  year         = {2007},
}