Streaming Instability for Particle-size Distributions

Leonardo Krapp, Pablo Benítez-Llambay, Oliver Gressel, Martin E. Pessah

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52 Scopus citations


The streaming instability is thought to play a central role in the early stages of planet formation by enabling the efficient bypass of a number of barriers hindering the formation of planetesimals. We present the first study exploring the efficiency of the linear streaming instability when a particle-size distribution is considered. We find that, for a given dust-to-gas mass ratio, the multi-species streaming instability grows on timescales much longer than those expected when only one dust species is involved. In particular, distributions that contain close-to-order-unity dust-to-gas mass ratios lead to unstable modes that can grow on timescales comparable to, or larger than, those of secular instabilities. We anticipate that processes leading to particle segregation and/or concentration can create favorable conditions for the instability to grow fast. Our findings may have important implications for a large number of processes in protoplanetary disks that rely on the streaming instability as usually envisioned for a unique dust species. Our results suggest that the growth rates of other resonant-drag instabilities may also decrease considerably when multiple species are considered.

Original languageEnglish
Article numberL30
JournalAstrophysical Journal Letters
Issue number2
StatePublished - 20 Jun 2019
Externally publishedYes


  • hydrodynamics
  • instabilities
  • protoplanetary disks


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