REBOUND: an open-source multi-purpose<i>N</i>-body code for collisional dynamics

Rein, Hanno; Liu, Shang-Fei

doi:10.1051/0004-6361/201118085

Cited by 919 publications

(705 citation statements)

References 23 publications

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“…We implemented the five bit-wise reversible integrators, Φ (2) , Φ (4) , Φ (6) , Φ (8) , and Φ (10) , which we collectively refer to as JANUS, in the open source REBOUND framework (Rein & Liu 2012). We also modified the Simulation Archive (Rein & Tamayo 2017b) to work seamlessly with JANUS.…”

Section: Methodsmentioning

confidence: 99%

JANUS: a bit-wise reversible integrator for N-body dynamics

Rein

Tamayo

2017

Monthly Notices of the Royal Astronomical Society

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Hamiltonian systems such as the gravitational N-body problem have time-reversal symmetry. However, all numerical N-body integration schemes, including symplectic ones, respect this property only approximately. In this paper, we present the new N-body integrator JANUS, for which we achieve exact time-reversal symmetry by combining integer and floating point arithmetic. JANUS is explicit, formally symplectic and satisfies Liouville's theorem exactly. Its order is even and can be adjusted between two and ten. We discuss the implementation of JANUS and present tests of its accuracy and speed by performing and analyzing long-term integrations of the Solar System. We show that JANUS is fast and accurate enough to tackle a broad class of dynamical problems. We also discuss the practical and philosophical implications of running exactly time-reversible simulations.

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Section: Methodsmentioning

confidence: 99%

JANUS: a bit-wise reversible integrator for N-body dynamics

Rein

Tamayo

2017

Monthly Notices of the Royal Astronomical Society

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“…The ring arcs observed would be the residual material confined in between these small satellites. Simulations of self-gravitating and colliding particles (see, e.g., Rein & Liu 2012) need to be performed to study the formation mechanisms of small satellites close to the Roche zone of a planet. Once the system of co-orbital bodies is in a stationary configuration, the secular torque and therefore the ring orbital migration are reduced (Sicardy & Lissauer 1992).…”

Section: Formation Processesmentioning

confidence: 99%

Neptune’s ring arcs: VLT/NACO near-infrared observations and a model to explain their stability

Renner

Sicardy

Souami

et al. 2014

A&A

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Context. Neptune's incomplete ring arcs have been stable since their discovery in 1984 although these structures should be destroyed in a few months through differential Keplerian motion. Regular imaging data are needed to address the question of the arc stability. Aims. We present the first NACO observations of Neptune's ring arcs taken at 2.2 μm (Ks band) with the Very Large Telescope in August 2007, and propose a model for the arc stability based on co-orbital motion. Methods. The images were aligned using the ephemerides of the satellites Proteus and Triton and were suitably co-added to enhance ring or satellite signals. Resonance theory and N-body simulations were used to model the arcs' confinement. Results. We derive accurate mean motion values for the arcs and Galatea and confirm the mismatch between the arcs' position and the location of the 42:43 corotation inclination resonance. We propose a new confinement mechanism where small co-orbital satellites in equilibrium trap ring arc material. We constrain the masses and locations of these hypothetical co-orbital bodies.

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“…Because planetary systems are chaotic fewbody systems, their stability can only be derived statistically from an ensemble of simulations. Each simulation takes ∼ 30 hours to finish on a modern CPU core using the IAS15 (Rein & Spiegel 2015) integrator, which is available in the rebound (Rein & Liu 2012) package. Our parameter space consists of three different models of star clusters and four different architectures of planetary systems, making it 12 ensembles of simulations.…”

Section: Resultsmentioning

confidence: 99%

SiMon: Simulation Monitor for Computational Astrophysics

Qian

Cai

Zwart

et al. 2017

PASP

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Scientific discovery via numerical simulations is important in modern astrophysics. This relatively new branch of astrophysics has become possible due to the development of reliable numerical algorithms and the high performance of modern computing technologies. These enable the analysis of large collections of observational data and the acquisition of new data via simulations at unprecedented accuracy and resolution. Ideally, simulations run until they reach some pre-determined termination condition, but often other factors cause extensive numerical approaches to break down at an earlier stage. In those cases, processes tend to be interrupted due to unexpected events in the software or the hardware. In those cases, the scientist handles the interrupt manually, which is time-consuming and prone to errors. We present the Simulation Monitor (SiMon) to automatize the farming of large and extensive simulation processes. Our method is light-weight, it fully automates the entire workflow management, operates concurrently across multiple platforms and can be installed in user space. Inspired by the process of crop farming, we perceive each simulation as a crop in the field and running simulation becomes analogous to growing crops. With the development of SiMon we relax the technical aspects of simulation management. The initial package was developed for extensive parameter searchers in numerical simulations, but it turns out to work equally well for automating the computational processing and reduction of observational data reduction.

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REBOUND: an open-source multi-purposeN-body code for collisional dynamics

Cited by 919 publications

References 23 publications

JANUS: a bit-wise reversible integrator for N-body dynamics

JANUS: a bit-wise reversible integrator for N-body dynamics

Neptune’s ring arcs: VLT/NACO near-infrared observations and a model to explain their stability

SiMon: Simulation Monitor for Computational Astrophysics

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