[P-PS07] Planetary Sciences

[PPS07-P03] The impact-induced atmospheric pollution and the implication for the planetary evolution

*Kenji Kurosaki¹ (1.Department of Physics, Nagoya University )

Keywords:Planetary science, Thermal evolution, Atmosphere

Many objects whose planetary radii are more significant than the Earth's radius. These large planetary radii suggest that these objects have atmospheres that vary from 1% to 30% of the planetary mass. The diversity of planetary atmospheres is due to differences in the atmosphere's accretion during the formation process in the protoplanetary disk. Moreover, collisional events and planetary evolutionary processes are influenced in the late stages of formation after the disk has disappeared. In the late stage of planet formation, collisional coalescence of planets is a common phenomenon. If the object has an atmosphere derived from a protoplanetary disk, it is expected to lose its primordial atmosphere during the collision. We have performed numerical fluid dynamics simulations using the Smoothed Particle Hydrodynamics method to quantify the atmospheric hydrogen loss due to collisions with planets with atmospheres. We also investigate the remaining bodies' structures after the collisional event using the results. We discuss the changes of atmospheric masses after the collision and through the long-term evolution of the planetary atmospheres.