The Disk Substructures at High Angular Resolution Project (DSHARP). VI. Dust Trapping in Thin-ringed Protoplanetary Disks
The Disk Substructures at High Angular Resolution Project (DSHARP). VI. Dust Trapping in Thin-ringed Protoplanetary Disks
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DOI：
10.3847/2041-8213/aaf742
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发表时间：
2018-12
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通讯作者：
C. Dullemond;T. Birnstiel;Jane Huang;N. Kurtovic;S. Andrews;V. Guzm'an;L. P'erez;A. Isella;Zhaohuan Zhu;M. Benisty;D. Wilner;X. Bai;J. Carpenter;Shangjia Zhang;L. Ricci
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作者：
C. Dullemond;T. Birnstiel;Jane Huang;N. Kurtovic;S. Andrews;V. Guzm'an;L. P'erez;A. Isella;Zhaohuan Zhu;M. Benisty;D. Wilner;X. Bai;J. Carpenter;Shangjia Zhang;L. Ricci
用阿尔马观测到的大部分原行星盘在连续体中显示出多个定义明确且近乎完美的圆环，在许多情况下具有显著的峰谷对比度。DSHARP活动表明，这些环中有几个在径向范围内非常狭窄。在这封信中，我们测试的假设，这些尘埃环是由尘埃捕获在径向压力颠簸，如果得到证实，把约束的物理尘埃捕获机制。我们在1D模型分析这个过程，假设轴对称。通过与观测数据的比较，我们发现所有的星环都与尘埃捕获相一致。基于一个合理的尘埃温度模型，我们发现几个环比压力标度的高度更窄，为尘埃捕获提供了强有力的证据。环具有在0.2和0.5之间的范围内的峰值吸收光学深度。储存在每个环中的尘埃质量大约是地球质量的几十倍，尽管由于尘埃不透明度的不确定性，仍然存在许多模糊性。尘埃环的密度足以潜在地触发流动的不稳定性，但我们的分析无法证明这种机制实际上在起作用。然而，我们的结果表明，非常低和非常大的颗粒的组合可以排除在这封信中研究的所有环的数据。
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.