期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 878, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/ab2596
关键词
hydrodynamics; instabilities; protoplanetary disks
资金
- European Research Council under the European Union's Horizon 2020 research and innovation programme [638596]
- European Union's Horizon 2020 research and innovation programme [748544]
- Independent Research Fund Denmark (DFF) [DFF 8021-00400B]
- Marie Curie Actions (MSCA) [748544] Funding Source: Marie Curie Actions (MSCA)
- European Research Council (ERC) [638596] Funding Source: European Research Council (ERC)
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.
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