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Long-lived Dust Asymmetries at Dead Zone Edges in Protoplanetary Disks
Miranda, Ryan; Li, Hui; Li, Shengtai; Jin, Sheng
2017
发表期刊ASTROPHYSICAL JOURNAL
卷号835期号:2页码:118-
摘要A number of transition disks exhibit significant azimuthal asymmetries in thermal dust emission. One possible origin for these asymmetries is dust trapping in vortices formed at the edges of dead zones. We carry out high-resolution, two-dimensional hydrodynamic simulations of this scenario, including the effects of dust feedback. We find that, although feedback weakens the vortices and slows down the process of dust accumulation, the dust distribution in the disk can nonetheless remain asymmetric for many thousands of orbits. We show that even after 104 orbits, or 2.5 Myr when scaled to the parameters of Oph IRS 48 (a significant fraction of its age), the dust is not dispersed into an axisymmetric ring, in contrast to the case of a vortex formed by a planet. This is because accumulation of mass at the dead zone edge constantly replenishes the vortex, preventing it from being fully destroyed. We produce synthetic dust emission images using our simulation results. We find that multiple small clumps of dust may be distributed azimuthally. These clumps, if not resolved from one another, appear as a single large feature. A defining characteristic of a disk with a dead zone edge is that an asymmetric feature is accompanied by a ring of dust located about twice as far from the central star.
语种英语
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/17385
专题太阳高能及相关物理过程研究团组
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Miranda, Ryan,Li, Hui,Li, Shengtai,et al. Long-lived Dust Asymmetries at Dead Zone Edges in Protoplanetary Disks[J]. ASTROPHYSICAL JOURNAL,2017,835(2):118-.
APA Miranda, Ryan,Li, Hui,Li, Shengtai,&Jin, Sheng.(2017).Long-lived Dust Asymmetries at Dead Zone Edges in Protoplanetary Disks.ASTROPHYSICAL JOURNAL,835(2),118-.
MLA Miranda, Ryan,et al."Long-lived Dust Asymmetries at Dead Zone Edges in Protoplanetary Disks".ASTROPHYSICAL JOURNAL 835.2(2017):118-.
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