JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Oral

P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS07] [JJ] Planetary Sciences

Wed. May 24, 2017 3:30 PM - 5:00 PM A04 (Tokyo Bay Makuhari Hall)

convener:Shunichi Kamata(Creative Research Institution, Hokkaido University), Takaya Okamoto(Planetary Exploration Research Center, Chiba Institute of Technology), Chairperson:Natsuki Hosono(Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto University), Chairperson:Masahiro Ogihara(National Astronomical Observatory of Japan)

4:30 PM - 4:45 PM

[PPS07-16] Collisional fragmentation of planetesimals in the giant impact stage

*Hiroshi Kobayashi1, Yutaro Sato1 (1.Department of Physics, Nagoya University)

Keywords:Planet formation, collisional fragmentation

Mars-sized protoplanets formed in a protoplanetary disk further grow to be terrestrial planets via mutual collisions between protoplanets or "giant impacts" after gas depletion, which are believed to from the terrestrial planets in the solar system. The resultant planets mainly have eccentricities much larger than those of Earth and Venus, so that the dynamical friction of a planetesimal disk is needed for eccentricity damping. However, planetesimals stirred by planets are dynamically so hot that collisional fragmentation of planetesimals inhibits the dynamical friction. Therefore, the N-body simulation including collisional fragmentation as well as dynamical friction is required for the investigation of giant impact stage. We newly develop the N-body code with protoplanets and super particles representing planetesimals and smaller fragments. Through the simulations with the code, we give constrains on the total mass and radii of planetesimals remaining in the giant impact stage.