Porosity models for pre-planetesimals: modified P-α like models and the effect of dissipated energy
Abstract
The outcome of collisions between pre-planetesimals is important in the theory of planetesimal formation by collisional growth and strongly depends on their internal structure. Since pre-planetesimals are highly porous, reaching 90% porosity, they could show the so called anomalous behaviour (decrease of density during shock compression, e.g. Bolkhovitinov & Khvostov 1978). Due to involved sizes (>dm), laboratory experiments are unfeasible therefore numerical simulations equipped with adequate porosity models are necessary.
Here we focus on the P-α model and its variations. We found that they are suitable for applications in the high porosity range only after a modification of the basic equations, that avoids an inconsistency and takes into account the effect of dissipated energy, is performed.- Publication:
-
The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution
- Pub Date:
- November 2011
- DOI:
- 10.1017/S1743921311020497
- Bibcode:
- 2011IAUS..276..395A
- Keywords:
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- equation of state;
- shock waves;
- interplanetary medium