Takanori Sasaki & Natsuki Hosono, Particle Number Dependence of The N-Body Simulations of Moon Formation, The Astrophysical Journal, 856, 175(14pp) (2018)
Abstract
The formation of the Moon from the circumterrestrial disk has been investigated by using N-body simulations with the number N of particles limited from 10^4 to 10^5. We develop an N-body simulation code on multiple Pezy-SC processors and deploy Framework for Developing Particle Simulators to deal with large number of particles. We execute several high- and extra-high-resolution N-body simulations of lunar accretion from a circumterrestrial disk of debris generated by a giant impact on Earth. The number of particles is up to 10^7, in which 1 particle corresponds to a 10 km sized satellitesimal. We find that the spiral structures inside the Roche limit radius differ between low-resolution simulations (N<10^5) and high-resolution simulations (N>10^6). According to this difference, angular momentum fluxes, which determine the accretion timescale of the Moon also depend on the numerical resolution.
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