The Disk Substructures at High Angular Resolution Project (DSHARP). VI. Dust Trapping in Thin-ringed Protoplanetary Disks

By C. Dullemond, T. Birnstiel, Jane Huang, N. Kurtovic, S. Andrews, V. Guzm'an, L. P'erez, Andrea Isella, Zhaohuan Zhu, M. Benisty and 5 more. Astrophysical Journal, 2018

263 citations recorded by the source corpus.

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 and very large grains can be excluded by the data for all the rings studied in this Letter.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/5269d2d53b3740ebb42d1ad77fca9c956e1dfbd6

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In Astronomy and Astrophysics

1. T. Birnstiel
2. D. Wilner
3. S. Andrews
4. Xue-Ning Bai
5. C. Dullemond
6. Zhaohuan Zhu
7. A. Hughes
8. L. Ricci

In Instrumentation

1. S. Andrews
2. T. Birnstiel
3. D. Wilner
4. Xue-Ning Bai
5. Zhaohuan Zhu
6. A. Hughes
7. J. Carpenter
8. C. Dullemond

Citations in the corpus

• The Disk Substructures at High Angular Resolution Project (DSHARP). I. Motivation, Sample, Calibration, and Overview (2018, background): “Dullemond et al. (2018) demonstrate this conclusion and derive a lower limit on the strength of the turbulence in the disk.”
• The Disk Substructures at High Angular Resolution Project (DSHARP). II. Characteristics of Annular Substructures (2018, methodology): “In a complementary analysis of several DSHARP sources, Dullemond et al. (2018) find evidence for dust trapping in the high-contrast outer rings in the AS 209, HD 163296, GW Lup, and Elias 24 disks based on comparisons between the ring widths and pressure scale heights.”
• The Disk Substructures at High Angular Resolution Project (DSHARP). VII. The Planet–Disk Interactions Interpretation (2018, methodology): “Dullemond et al. (2018) estimated that the α/St is between 0.077 and 0.66 at the 77 au bright ring.”
• One Solution to the Mass Budget Problem for Planet Formation: Optically Thick Disks with Dust Scattering (2019, methodology): “Huang et al. (2018a) has chosen a conservative value of φ = 0.02, which is also used in Dullemond et al. (2018) and Zhang et al. (2018).”