Abstract
One of the key problems in the concept of planetary systems origin and early evolution is solid bodies formation in the protoplanetary gas-dust disc around young stars. Dust particles interactions inside the original fluffy dust clusters of fractal nature resulted from gravitational instability and fragmentation in the disc’s central plane areassumed as the most plausible mechanism of primary bodies set up owing to particles integration within the clusters. Follow upcollisions are regarded to be responsible for eventual growth of primary bodies to the size of planetesimals. We discuss this scenario including chemical nature of particles depending on the disc’s radial temperature distribution and phase transitions. The mathematical model is developed based on the method of penetrating particles with the account for internal structure/properties of bodies involved, complicated patterns of their interaction, and phenomenological approach to describe energy distribution in the contact zone. The model is mainly addressed to the stage of formed solid bodies collisions. The results of numerical evaluation of the model are described involving some constraints for complete or partial destruction of colliding bodies followed by either scattering of collisional fragments orpartial back accumulation.
Highlights
Study of planetary systems origin and early evolution is a key fundamental problem of the modern astrophysics
The models proceed from an idea of successive growth of solid particles due to their collisional interactions in the disc matter since the very beginning such a scenario is poorly justified
It contradicts to the laboratory experiments of particle collisions under rather high velocities which are assumed to occur in the real conditions
Summary
Study of planetary systems origin and early evolution is a key fundamental problem of the modern astrophysics It is rooted in accretion discs formation around single, close binary and even multiple stars. The models proceed from an idea of successive growth of solid particles due to their collisional interactions in the disc matter since the very beginning such a scenario is poorly justified. It contradicts to the laboratory experiments of particle collisions under rather high velocities which are assumed to occur in the real conditions. Physical mechanism of particle interactions is a key to ensure the follow up processes of primordial bodies and planets formation
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