期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 869, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aaf742
关键词
protoplanetary disks
资金
- German Science Foundation (DFG) [FOR 2634, DU 414/22-1, DU 414/23-1]
- European Research Council (ERC) under the European Union [714769]
- National Aeronautics and Space Administration [NNX15AB06G, 17-XRP17_2-0012]
- National Science Foundation Graduate Research Fellowship [DGE-1144152]
- ngVLA Community Studies program
- National Aeronautics and Space Administration through the Astrophysics Theory Program [NNX17AK40G]
- Sloan Research Fellowship
- Texas Advanced Computing Center (TACC) at The University of Texas at Austin through XSEDE grant [TG-AST130002]
- ANR of France [ANR-16-CE31-0013]
- CONICYT [Basal AFB-17002]
- National Science Foundation [AST-1715719]
- FCFM/U. de Chile Fondo de Instalacion Academica
A large fraction of the protoplanetary disks observed with ALMA display multiple well-defined and nearly perfectly circular rings in the continuum, in many cases with substantial peak-to-valley contrast. The DSHARP campaign shows that several of these rings are very narrow in radial extent. In this Letter we test the hypothesis that these dust rings are caused by dust trapping in radial pressure bumps, and if confirmed, put constraints on the physics of the dust trapping mechanism. We model this process analytically in 1D, assuming axisymmetry. By comparing this model to the data, we find that all rings are consistent with dust trapping. Based on a plausible model of the dust temperature we find that several rings are narrower than the pressure scale height, providing strong evidence for dust trapping. The rings have peak absorption optical depth in the range between 0.2 and 0.5. The dust masses stored in each of these rings is of the order of tens of Earth masses, though much ambiguity remains due to the uncertainty of the dust opacities. The dust rings are dense enough to potentially trigger the streaming instability, but our analysis cannot give proof of this mechanism actually operating. Our results show, however, that the combination of very low alpha(turb) << 5 x 10(-4) and very large alpha(grain) >> 0.1 cm grain can be excluded by the data for all the rings studied in this Letter.
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