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On the Growth Mechanism of Grains in a Primordial Stage of the Solar Nebula

Published online by Cambridge University Press:  14 August 2015

A. Carusi
Affiliation:
Istituto di Geologia e Paleontologia, Università di Roma, Italy
A. Coradini
Affiliation:
Istituto di Geologia e Paleontologia, Università di Roma, Italy
C. Federico
Affiliation:
Istituto di Geologia e Paleontologia, Università di Roma, Italy
M. Fulchignoni
Affiliation:
Laboratorio di Astrofisica Spaziale, CNR, Frascati, Italy
G. Magni
Affiliation:
Laboratorio di Astrofisica Spaziale, CNR, Frascati, Italy

Abstract

Grain accretion processes in a protoplanetary nebula have been studied regarding: (a) the distribution function of grain velocities; (b) electrostatic and electromagnetic mechanisms between grains. The velocity distribution function has been investigated for grains embedded in a turbulent gaseous medium. Results have been obtained for protoplanetary nebula densities ranging from 10−19 to 10−10 g cm−3. Considering interactions between two grains, photoelectrically charged by galactic ultraviolet flux and by charged-particle capture, and solid-solid interactions (dipole fluctuation effect), the authors estimate the physical cross section σ(v) with respect to the geometric one σ0. Then a statistical approach for an assembly of grains gives the accretion or destruction rates for these small particles. Therefore, according to their characteristic velocities, the following processes have been studied: rupture, fusion, vaporization.

Type
Part I Origin and General Physics of the Planetary System
Copyright
Copyright © Reidel 1974 

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