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A Very Fast Symplectic Integrator for Planetary Systems: WHFast512 in x86 Assembly
Rishit Dagli, Hanno Rein
Long-term integrations of planetary systems are used in a variety of astrophysical applications, for example to determine a system's stability. In this paper, we describe significa…
Rings in the Sky: Orbital Data Centres and Potential Impacts to Astronomy and the Sky
Aaron C. Boley, Samantha M. Lawler, Hanno Rein
Megaconstellations of orbital data centres (ODCs) have the potential to fundamentally change the sky without a concerted mitigation effort. Potential changes include producing larg…
Democratic heliocentric coordinates underestimate the rate of instabilities in long-term integrations of the Solar System
Hanno Rein, Kavi Dey, Daniel Tamayo
Wisdom-Holman (WH) integrators are symplectic operator-splitting methods widely used for long-term N-body simulations of planetary systems. Most implementations use either Jacobi c…
On the statistical convergence of N-body simulations of the Solar System
Hanno Rein, Garett Brown, Mei Kanda
Most direct N-body integrations of planetary systems use a symplectic integrator with a fixed timestep. A large timestep is desirable in order to speed up the numerical simulations…
Collisional Fragmentation Support in TRACE
Tiger Lu, Haniyeh Tajer, David M. Hernandez +3
We present improved collision support for TRACE, a state-of-the-art hybrid integrator in REBOUND. TRACE now supports collisional fragmentation and can handle both removing and addi…
SPOCK 2.0: Update to the FeatureClassifier in the Stability of Planetary Orbital Configurations Klassifier
Elio Thadhani, Yolanda Ba, Hanno Rein +1
The Stability of Planetary Orbital Configurations Klassifier (SPOCK) package collects machine learning models for predicting the stability and collisional evolution of compact plan…
A substellar flyby that shaped the orbits of the giant planets
Garett Brown, Renu Malhotra, Hanno Rein
The modestly eccentric and non-coplanar orbits of the giant planets pose a challenge to solar system formation theories which generally indicate that the giant planets emerged from…
TRACE: a code for Time-Reversible Astrophysical Close Encounters
Tiger Lu, David M. Hernandez, Hanno Rein
We present TRACE, an almost time-reversible hybrid integrator for the planetary N-body problem. Like hybrid symplectic integrators, TRACE can resolve close encounters between parti…
Polluting White Dwarfs with Oort Cloud Comets
Dang Pham, Hanno Rein
Observations point to old white dwarfs (WDs) accreting metals at a relatively constant rate over 8~Gyrs. Exo-Oort clouds around WDs have been proposed as potential reservoirs of ma…
Satellite Visibility During the April 2024 Total Eclipse
Samantha M. Lawler, Hanno Rein, Aaron C. Boley
On 8 April 2024, tens of millions of people across North America will be able to view a total solar eclipse. Such astronomical events have been important throughout history, but wi…
A new timestep criterion for N-body simulations
Dang Pham, Hanno Rein, David S. Spiegel
We derive a new criterion for estimating characteristic dynamical timescales in N-body simulations. The criterion uses the second, third, and fourth derivatives of particle positio…
WHFast512: A symplectic N-body integrator for planetary systems optimized with AVX512 instructions
Pejvak Javaheri, Hanno Rein, Dan Tamayo
We describe the implementation of the symplectic N-body integrator WHFast512 using Single Instruction Multiple Data (SIMD) parallelism and 512-bit Advanced Vector Extensions (AVX51…
ASSIST: An Ephemeris-Quality Test Particle Integrator
Matthew J. Holman, Arya Akmal, Davide Farnocchia +5
We introduce ASSIST, a software package for ephemeris-quality integrations of test particles. ASSIST is an extension of the REBOUND framework and makes use of its IAS15 integrator…
General relativistic precession and the long-term stability of the solar system
Garett Brown, Hanno Rein
The long-term evolution of the solar system is chaotic. In some cases, chaotic diffusion caused by an overlap of secular resonances can increase the eccentricity of planets when th…
Self-Consistent Spin, Tidal and Dynamical Equations of Motion in the REBOUNDx Framework
Tiger Lu, Hanno Rein, Daniel Tamayo +4
We have introduced self-consistent spin, tidal and dynamical equations of motion into REBOUNDx, a library of additional effects for the popular N-body integrator REBOUND. The equat…
Thermal hysteresis and front propagation in dense planetary rings
Rémy Larue, Henrik Latter, Hanno Rein
Saturn's rings are composed of icy grains, most in the mm to m size ranges, undergoing several collisions per orbit. Their collective behaviour generates a remarkable array of stru…
On the long-term stability of the Solar System in the presence of weak perturbations from stellar flybys
Garett Brown, Hanno Rein
The architecture and evolution of planetary systems are shaped in part by stellar flybys. Within this context, we look at stellar encounters which are too weak to immediately desta…
An Implementation of Stochastic Forces for the N-body code REBOUND
Hanno Rein, Nick Choksi
We describe the implementation of a new module which can be used to simulate physical systems in which the motion of particles is affected by stochastic forces. Such forces are exp…
The vertical structure of debris disks and the impact of gas
Johan Olofsson, Philippe Thébault, Quentin Kral +10
The vertical structure of debris disks provides clues about their dynamical evolution and the collision rate of the unseen planetesimals. Thanks to the ever-increasing angular reso…
BEBOP III. Observations and an independent mass measurement of Kepler-16 (AB) b -- the first circumbinary planet detected with radial velocities
Amaury H. M. J. Triaud, Matthew R. Standing, Neda Heidari +30
The radial velocity method is amongst the most robust and most established means of detecting exoplanets. Yet, it has so far failed to detect circumbinary planets despite their rel…
Visibility Predictions for Near-Future Satellite Megaconstellations: Latitudes near 50 Degrees will Experience the Worst Light Pollution
S. M. Lawler, A. C. Boley, H. Rein
Megaconstellations of thousands to tens of thousands of artificial satellites (satcons) are rapidly being developed and launched. These satcons will have negative consequences for…
A Bayesian neural network predicts the dissolution of compact planetary systems
Miles Cranmer, Daniel Tamayo, Hanno Rein +5
Despite over three hundred years of effort, no solutions exist for predicting when a general planetary configuration will become unstable. We introduce a deep learning architecture…
A repository of vanilla long term integrations of the Solar System
Garett Brown, Hanno Rein
We share the source code and a 121 GB dataset of 96 long-term N-body simulations of the Solar System. This dataset can be analyzed by itself to study the dynamics of the Solar Syst…
Predicting the long-term stability of compact multiplanet systems
Daniel Tamayo, Miles Cranmer, Samuel Hadden +11
We combine analytical understanding of resonant dynamics in two-planet systems with machine learning techniques to train a model capable of robustly classifying stability in compac…