PMO OpenIR  > 星系中的恒星形成研究团组
Grain growth in protoplanetary disks
Lu Tao ; Ji Jianghui
Source PublicationProgress in Astronomy
AbstractIn star-formation theory, a flat, rotating disk always formed after star formation in the molecular cores which own initial angular momentum. It is so-called protoplanetary disk, which consists of gas and dust. The mass ratio of gas to dust is 100 : 1. Gas may be accreted onto the central star, or dissipated through photoevaporation, radiation pressure and in/outflow. Portion of dust is dissipated or accreted because it is coupled strongly with gas, and others will further grow from interstellar dust (sub-mum) to planetesimal (10 km) or planet finally. Dust growth can be confirmed by observation features, e.g., statistical investigations of presence of dust emission as a function of age, Si-O stretching vibrations in silicates around 10 mum and the analysis of the size and optical depth structure of silhouette disks. In growth process, the key issue is collision adhesion. There are various mechanisms that lead to collision, so collision velocities may distribute in a broad range. However, dust growth is not synchronized. The timescales of growth differ in the various locations in the disk. At the same time, the exchange of material still occurs in the disk for inflow/outflow, sedimentation, etc. Hence, the collision process will be quite complex and the outcomes may be diverse. These results dominate the growth process of dust. In this sense, dust growth may directly have influence on the properties of protoplanetary disk and planetary formation. Therefore, the study can not only improve the understanding of characteristics of a protoplanetary disk, but also reveal the scenario of material evolution at the early stage of planetary formation, by investigating the process of dust growth in the protoplanetary disk.
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Recommended Citation
GB/T 7714
Lu Tao,Ji Jianghui. Grain growth in protoplanetary disks[J]. Progress in Astronomy,2012,30(3):284-301.
APA Lu Tao,&Ji Jianghui.(2012).Grain growth in protoplanetary disks.Progress in Astronomy,30(3),284-301.
MLA Lu Tao,et al."Grain growth in protoplanetary disks".Progress in Astronomy 30.3(2012):284-301.
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File name: 2012189Grain growth in protoplanetary disks原行星盘中尘埃生长的研究现状.pdf
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