Abstract
The sequence of evolution of the protoplanetary gas-and-dust disk around the parent star includes, according to modern concepts, its compression in the central plane and decay into separate dust condensations (clusters) due to the occurrence of various types of instabilities. The interaction of dust clusters of a fractal structure during their collisions is considered as a key mechanism for the formation and growth of primary solids, which serve as the basis for the subsequent formation of planetesimals and embryos of planets. Among the mechanisms contributing to the formation of planetesimals, an important place belongs, along with gravitational instability, hydrodynamic instabilities, in particular, the socalled streaming instability of the two-phase gas-dust layer due to its ability to concentrate dispersed particles in dense clots. In contrast to a number of existing models of streaming instability, in which dust particles are considered structurally compact and monodisperse, this paper proposes a more realistic model of polydisperse particles of fractal nature, forming dust clusters as a result of coagulation. The instability of the dust layer in the central plane of the protoplanetary disk under linear axisymmetric perturbations of its parameters is considered. A preliminary conclusion can be drawn that the proposed model of dust fractal aggregates of different scales increases the efficiency of linear growth of hydrodynamic instabilities, including the streaming instabilities associated with the difference between the velocities of the dust and gas phases.
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Acknowledgements
The work was performed in the framework of the State Task of Keldysh Institute of Applied Mathematics and Vernadsky Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences with partial support by the Russian Foundation for Basic Research, project nos. 17-02-00507 and 18-01-00064, and by the Presidium of the Russian Academy of Sciences, program no. 12.
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Russian Text © The Author(s), 2019, published in Astronomicheskii Vestnik, 2019, Vol. 53, No. 3, pp. 195–213.
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Kolesnichenko, A.V., Marov, M.Y. Streaming Instability in the Gas-Dust Medium of the Protoplanetary Disc and the Formation of Fractal Dust Clusters. Sol Syst Res 53, 181–198 (2019). https://doi.org/10.1134/S003809461903002X
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DOI: https://doi.org/10.1134/S003809461903002X