Abstract: Planetary systems form in gas–dust protoplanetary discs via the growth of solid bodies. In this paper, we show that the most intriguing stage of such growth, namely the transformation of 1–10 m boulders into kilometre-sized planetesimals, can be explained by a mechanism of gravitational instability. The present work focused on the origin of self-gravitating clumps in which planetesimal formation could take place. Our computer simulations demonstrated that such clumps of gas and boulders formed due to the development of a two-phase instability. This instability revealed a so-called ‘mutual influence effect’ in the protoplanetary disc, where the dynamics of the system were determined by the collisionless collective motion of a low-mass subdisc composed of primary solids. We found that a 0.1cs velocity dispersion in the boulder subdisc was sufficient to cause the formation of self-gravitating clumps of gas and boulders. In such regimes, the time needed for the formation of the collapsing objects was less than the boulders’ dissipation time in the density waves of the medium.

Cite: Snytnikov V.N. , Stoyanovskaya O.P.
Clump Formation Due to the Gravitational Instability of a Multiphase Medium in a Massive Protoplanetary Disc
Monthly Notices of the Royal Astronomical Society. 2013. V.428. N1. P.2-12. DOI: 10.1093/mnras/sts002 WOS Scopus РИНЦ OpenAlex

Files: Full text from publisher

Dates:

Submitted:	Jul 29, 2011
Accepted:	Sep 13, 2012
Published online:	Oct 23, 2012
Published print:	Jan 1, 2013

Identifiers:

Web of science:	WOS:000318227900011
Scopus:	2-s2.0-84872370782
Elibrary:	20418968
OpenAlex:	W2143890322

Citing:

DB	Citing
Web of science	6
Scopus	7
Elibrary	12
OpenAlex	12

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