S. J. Aarseth
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Ejected from home: C/1980 E1 (Bowell) and C/2024 L5 (ATLAS) Open
Context . Natural interstellar objects do not form isolated in deep space, but escape their natal planetary systems. Early removal from their home star systems via close flybys with still-forming planets could be the dominant ejection mech…
A complete N-body model of the old open cluster M67 Open
The old open cluster M67 is an ideal testbed for current cluster evolution models because of its dynamically evolved structure and rich stellar populations that show clear signs of interaction between stellar, binary and cluster evolution.…
The formation of a bound star cluster: From the Orion nebula cluster to the Pleiades Open
Direct N-body calculations are presented of the formation of Galactic clusters using GASEX, which is a variant of the code Nbody6. The calculations focus on the possible evolution of the Orion nebula cluster (ONC) by assuming that the embe…
Dynamical models with stellar evolution and binaries Open
The recent availability of the powerful GRAPE-6 hardware designed specifically to tackle the gravitational N-body problem, has coincided with the production of realistic N-body software that includes a detailed treatment of stellar and bin…
View article: Asymmetrical tidal tails of open star clusters: stars crossing their cluster’s práh† challenge Newtonian gravitation
Asymmetrical tidal tails of open star clusters: stars crossing their cluster’s práh† challenge Newtonian gravitation Open
After their birth a significant fraction of all stars pass through the tidal threshold (práh) of their cluster of origin into the classical tidal tails. The asymmetry between the number of stars in the leading and trailing tails tests grav…
Where the Solar system meets the solar neighbourhood: patterns in the distribution of radiants of observed hyperbolic minor bodies Open
Observed hyperbolic minor bodies might have an interstellar origin, but they can be natives of the Solar system as well. Fly-bys with the known planets or the Sun may result in the hyperbolic ejection of an originally bound minor body; in …
Dynamical impact of the Planet Nine scenario: <i>N</i>-body experiments Open
The Planet Nine hypothesis has now enough constraints to deserve further attention in the form of detailed numerical experiments. The results of such studies can help us improve our understanding of the dynamical effects of such a hypothet…
The dragon simulations: globular cluster evolution with a million stars Open
Introducing the dragon simulation project, we present direct N-body simulations of four massive globular clusters (GCs) with 106 stars and 5 per cent primordial binaries at a high level of accuracy and realism. The GC evolution is computed…
A Dynamical Gravitational Wave Source in a Dense Cluster Open
Making use of a new N -body model to describe the evolution of a moderate-size globular cluster, we investigate the characteristics of the population of black holes within such a cluster. This model reaches core-collapse and achieves a pea…