Discs and Planetary Formation
نویسنده
چکیده
The formation, structure and evolution of protoplanetary discs is considered. The formation of giant planets within the environment of these models is also discussed.
منابع مشابه
Observational evidence for dust growth in proto-planetary discs
The dust in the interstellar medium, that provides the material for forming stars and circumstellar discs as a natural by-product is known to have submicron sizes. As these discs are the sites of planet formation, those small grains are predicted to grow to larger entities when the stars are still young. I will review evidence for the first steps in grain growth in proto-planetary discs around ...
متن کاملThe dispersal of planet-forming discs: theory confronts observations
Discs of gas and dust around million-year-old stars are a by-product of the star formation process and provide the raw material to form planets. Hence, their evolution and dispersal directly impact what type of planets can form and affect the final architecture of planetary systems. Here, we review empirical constraints on disc evolution and dispersal with special emphasis on transition discs, ...
متن کاملPlanetesimal growth in turbulent discs before the onset of gravitational instability
It is difficult to imagine a planet formation model that does not at some stage include a gravitationally unstable disc. Initially unstable gas-dust discs may form planets directly, but the high surface density required has motivated the alternative that gravitational instability occurs in a dust sub-layer only after grains have grown large enough by electrostatic sticking. Although such growth...
متن کاملPlanetary system formation in thermally evolving viscous protoplanetary discs.
Observations of extrasolar planets are providing new opportunities for furthering our understanding of planetary formation processes. In this paper, we review planet formation and migration scenarios and describe some recent simulations that combine planetary accretion and gas-disc-driven migration. While the simulations are successful at forming populations of low- and intermediate-mass planet...
متن کاملThe Roles of Discs for Planetary Systems
It is known that the discs are detected for some of the extra-solar planetary systems. It is also likely that there was a disc mixing with planets and small bodies while our Solar System was forming. From our recent results, we conclude that the discs play two roles: the gravity makes planetary systems more chaotic and the drag makes planetary systems more resonant.
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تاریخ انتشار 1999