Temperature distribution in the solar nebula at successive stages of its evolution |
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| Authors: | A B Makalkin V A Dorofeeva |
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| Institution: | 1.Schmidt Institute of Physics of the Earth,Russian Academy of Sciences,Moscow,Russia;2.Vernadsky Institute of Geochemistry and Analytical Chemistry,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | We have constructed a model of the solar nebula that allows for the temperature and pressure distributions at various stages
of its evolution to be calculated. The mass flux from the accretion envelope to the disk and from the disk to the Sun, the
turbulent viscosity parameter α, the opacity of the disk material, and the initial angular momentum of the protosun are the
input model parameters that are varied. We also take into account the changes in the luminosity and radius of the young Sun.
The input model parameters are based mostly on data obtained from observations of young solar-type stars with disks. To correct
the input parameters, we use the mass and chemical composition of Jupiter, as well as models of its internal structure and
formation that allow constraints to be imposed on the temperature and surface density of the protoplanetary disk in Jupiter’s
formation zone. Given the derived constraints on the input parameters, we have calculated models of the solar nebula at successive
stages of its evolution: the formation inside the accretion envelope, the evolution around the young Sun going through the
T Tauri stage, and the formation and compaction of a thin dust layer (subdisk) in the disk midplane. We have found the following
evolutionary trend: an increase in the temperature of the disk at the stage of its formation, cooling at the T Tauri stage,
and the subsequent internal heating of the dust subdisk by turbulence dissipation that causes a temperature rise in the formation
zone of the terrestrial planets at the high subdisk density and the opacity in this zone. We have obtained the probable ranges
of temperatures in the disk midplane, i.e., the temperatures of the protoplanetary material in the formation region of the
terrestrial planets at the initial stage of their formation. |
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