Thermal velocity equilibrium in the protoplanetary cloud

Details Thermal velocity equilibrium in the protoplanetary cloud Thermal velocity equilibrium in the protoplanetary cloud

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...64..295h&link_type=abstract

Icarus (ISSN 0019-1035), vol. 64, Nov. 1985, p. 295-307.

Computer Science

44

Planetary Atmospheres, Planetary Evolution, Planetary Temperature, Protoplanets, Solar System, Thermodynamic Equilibrium, Collision Parameters, Fokker-Planck Equation, Gravitational Effects, Inelastic Scattering, Planetary Mass

Scientific paper

In this paper, the temperatures in the planetary nebula are determined based on a competition between cooling by inelastic impacts and heating by gravitational encounters. A kinetic formalism with a Fokker-Planck operator in Landau's form is used to give analytical and simple results. One of the two cases investigated is a one-population disk of planetesimals, which is found to stabilize itself in a quasi-stationary state with a given temperature and a relation for the spread of the orbital elements. The maximum range of the gravitational interaction in this case is determined. In the second case, a disk of planetismals with a distribution of mass, the dynamical friction is found to play a role, and the equilibrium equations for the temperature are easily derived.

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