210 citations · 678 across the 40 of their papers we have counts for
13 papers · 1 filter
Star Cluster Ecology VIII. -- Dynamically Forming S-Type and Centauri-like Systems
Erwan Hochart, Simon Portegies Zwart
Aims: To analyse the impact of dynamically formed binaries emerging naturally from various star cluster environments on already established planetary systems. Methods: Numerical si…
A triple-induced merger in T Ori C, solves the proplyd lifetime problem and the curiously young shell of M42
Maite Wilhelm, Alessandro Alberto Trani, Simon Portegies Zwart
There has long been a tension between the stellar ages in the Orion Nebula Cluster and the rapid external photoevaporation of its protoplanetary discs. Recently, the shell of the O…
Spin-disc misalignment drives periodic accretion and pulse profile asymmetry in X-ray pulsars
A. A. Mushtukov, V. Ganesh, S. S. Tsygankov +2
We investigate magnetospheric accretion in disc-fed X-ray pulsars assuming that the neutron star spin axis is not perpendicular to the disc plane. We focus on X-ray pulsars, where…
Validating direct solvers for Newton's gravitational N-body problem, and the systematic comparison between IEEE floating point and Posits
Simon Portegies Zwart
We present a systematic comparison between arbitrary precise arithmetic and integration, IEEE-754 compliant floating point arithmetic (fp16, bfp16, fp32, double precision fp64, and…
Planet-moon ejections in close stellar encounters
Yannick Badoux, Simon Portegies Zwart
Free-floating planet-moon pairs (FFPMs) may form when planetary systems experience close stellar encounters. We quantify moon-retention probabilities and ejection cross sections fo…
Recoiling Black Holes I. Burst of Observables
Erwan Hochart, Simon Portegies Zwart
We aim to investigate the tidal disruption and gravitational wave events shortly after a massive black hole binary merges in the galactic centre and whose remnant black hole is eje…
ReLaTS: a Reinforcement Learning-based method for dynamically determining the coupling Time Step in multi-scale simulations of self-gravitating systems
Veronica Saz Ulibarrena, Simon Portegies Zwart
Astrophysical simulations frequently address multi-scale, multi-physics problems through subsystem decomposition, problem-tailored integration schemes, and coupling on fixed manual…
Centrally concentrated star formation in young clusters II: Jet feedback
Adilkhan Assilkhan, Sabrina M. Appel, Bekdaulet Shukirgaliyev +5
Protostellar jets are one of the earliest forms of stellar feedback, but their impact on star formation and cluster assembly in centrally concentrated molecular clouds remains poor…
Oort Cloud Ecology -- IV. Exchanging Asteroids
Erwan Hochart, Simon Portegies Zwart
Aims. Investigate the influence of cluster environments on asteroids, with special attention towards captured material. Methods. Using numerical methods, a sub-virial fractally dis…
Kozai-driven mass loss of the circumbinary disk in D9 in orbit around the supermassive black hole Sgr A*
Yannick Badoux, Lucas Pouw, Tim van der Vuurst +1
The supermassive black hole (Sgr A*) in the Galactic center is surrounded by the S-star cluster consisting of young stars on eccentric orbits. Recently, the S-star binary, called D…
The exponential growth of infinitesimal perturbations in the long-term evolution of simulated galaxies
T. Asano, S. Portegies Zwart
Self-gravitating systems of particles are chaotic. We study how chaotic the Galaxy is, and what the consequences are. We therefore simulated the dynamical evolution of a galaxy…
Nemesis: A Multi-Scale, Multi-Physics Algorithm for Astrophysics
Erwan Hochart, Simon Portegies Zwart
In this work, an updated version of the multi-scale, multi-physics algorithm, Nemesis which makes use of the Astrophysical Multipurpose Software Environment (AMUSE). The algorithm…
The formation of periodic three-body orbits for Newtonian systems
Simon Portegies Zwart, Arjen Doelman, Jelmer Sein
Braids are periodic solutions to the general N-body problem in gravitational dynamics. These solutions seem special and unique, but they may result from rather usual encounters bet…