Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p43b1434n&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P43B-1434
Other
[6020] Planetary Sciences: Comets And Small Bodies / Ices, [6022] Planetary Sciences: Comets And Small Bodies / Impact Phenomena, [6296] Planetary Sciences: Solar System Objects / Extra-Solar Planets
Scientific paper
We have worked on the collisions of icy bodies using Smoothed Particles Hydrodynamics (SPH) method combined with Gravity PipE (GRAPE) in order to understand the basic behavior of icy bodies during impacts. Collisions of Mars-size rocky bodies have been investigated well, because those collisions are related to the origin of the moon and the formation of the terrestrial planets. On the other hand, collisions of icy bodies have not been studied yet, although these collisions would frequently occur in the solar and extra-solar systems, such as the formation of icy exoplanets. Through our research, we figure out the effect of ice during impact in detail. Our SPH code has two special features. First, GRAvity PipE computer (GRAPE) is used, which calculates the gravitational force of each particle up to 100 times faster than usual computers. Second, SESAME equation of state database is used to build a realistic model, taking into account the effect of phase change. In this research, we focused on differences and similarities between collisions of icy bodies and those of rocky ones, such as a merging criterion. Agnor & Asphaug (2004) have shown that a collision of rocky Mars-size protoplanets leads to an inelastic collision when its relative velocities are smaller than 1.4-1.5v, 1.1-1.2v, 1.1-1.2v when its impact angles are 30, 45, and 60 degrees, respectively. Here, v means escape velocity. The same calculations for icy bodies are performed in our numerical code. They have shown that the merging criterion of icy bodies is the same as that of rocky bodies. In addition to the merging criterion, we also clarify the relationship between impact parameters and the change of solid, liquid/vapor mass ratio due to impacts.
Genda Hidenori
Ida Shigeru
Nakajima Motoki
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