Large-scale planetesimal formation by streaming instability
نویسندگان
چکیده
منابع مشابه
Planetesimal Formation by Gravitational Instability
We investigate the formation of planetesimals via the gravitational instability of solids that have settled to the midplane of a circumstellar disk. Vertical shear between the gas and a subdisk of solids induces turbulent mixing which inhibits gravitational instability. Working in the limit of small, well-coupled particles, we find that the mixing becomes ineffective when the surface density ra...
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Introduction. Two prevailing processes of planetesimal formation are proposed. The first is the gravitational instability of a dust layer (e.g., Safronov 1969, Hayashi 1972, Goldreich and Ward 1973). The second is the growth through the mutual sticking of dust particles in a turbulent nebula (Weidenschilling and Cuzzi 1993, Stepinski and Valageas 1997). We consider the first one in this study. ...
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Late in the gaseous phase of a protostellar disk, centimeter-sized bodies probably settle into a thin “dust layer” at the midplane. A velocity difference between the dust layer and the gas gives rise to turbulence, which prevents further settling and direct gravitational instability of the layer. The associated drag on the surface of the layer causes orbital decay in a few thousand years—as opp...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2013
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921313008284