[M-GI33] Computational sciences on the universe, galaxies, stars, planets, and their environments

[MGI33-08] Development of simulation code for planetary system formation (GPLUM) : Prospect by high-resolution N-body simulation

*Yota Ishigaki^1,2, Eiichiro Kokubo³, Masaki Fujimoto², Junichiro Makino^4,5 (1.University of Tokyo, 2.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3.National Astronomical Observatory of Japan, 4.Kobe University, 5.RIKEN Center for computational Science)

Keywords:planet formation, N-body simulation

It is generally accepted that planetary systems are formed from protoplanetary disks surrounding a central star. In the standard model, planets are formed by the accretion of planetesimals in the disk. The accretion process of planetesimals is mainly investigated using N-body simulations of planetesimal systems.

In this study, we have developed a new N-body simulation code, GPLUM, using the particle-particle particle-tree scheme (P³T scheme). We have implemented a more efficient algorithm than the conventional P³T code in GPLUM, which enables us to perform global, high-resolution N-body simulations. With GPLUM we can conduct new experiments such as parameter surveys using N-body simulations.

We present results of large-scale N-body simulations of the formation process of planetary systems by GPLUM using the supercomputer Fugaku. We investigate the resolution dependence of N-body simulations of the planet formation process by the high-resolution simulation. By comparing the results of N-body simulations with N=10⁴, 10⁵, and 10⁶, we discuss how the accretion process of planetesimals and protoplanets is affected by the resolution of N-body simulations.

We also investigate the planetesimal accretion with a new collision model, which is derived from the SPH collision experiments. We discuss the dependence of the planetesimal growth on the collision model. We also present the future prospects of planet formation simulations using high-resolution N-body simulations with GPLUM on Fugaku.