[P-PS07] 惑星科学

[PPS07-06] Relation between Impact Energy and Outcome of Collision with Mass Transfer

*長谷川 幸彦¹、田中 秀和¹、鈴木 建²、小林 浩³、和田 浩二⁴ (1.東北大学、2.東京大学、3.名古屋大学、4.千葉工業大学)

キーワード：数値計算、惑星形成、原始惑星系円盤

By performing N-body simulations of submicron-sized water-ice dust monomers, we investigated the fundamental processes of collisional sticking and fragmentation of dust aggregates. In our previous studies, we showed that the critical collisional fragmentation velocity of dust aggregates strongly depends on the mass ratio. We re-evaluated our numerical results shown in our previous studies in terms of the normalized specific impact energy of the two colliding bodies not the collision velocity as in our previous papers, which is the impact energy normalized by the product of the total monomer number of the colliding bodies and the energy for breaking a single contact between two dust monomers in the equilibrium position. We found that for collisions with mass transfer events from the larger target to the smaller projectile, the critical value of the normalized specific impact energy for collisional fragmentation is independent of the mass ratio of the two colliding bodies and is given by about 4. This suggests that the mass transfer from the target to the projectile is not a local phenomenon around the point of impact on the larger target, but a global one related to the entire colliding bodies.