引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 20次   下载 36 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Volatile Depletion in Planet-Forming Disks
Fujun Du*
Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210033, China
Abstract:
Newly born stars are surrounded by gas and dust with a attened axisymmetric distribution termed protoplanetary disk, in which planets are formed. Observations of these objects are necessary for understanding the formation and early evolution of stars and planets, and for revealing the composition of the raw material from which planets are made. Numerical models can extract important parameters from the observational data, including the gas and dust mass of the disk. These parameters are used as input for further modeling, e.g., to calculate the chemical composition of the disk. A consistent thermochemical model should be able to reproduce the abundances of different species in the disk. However, this good wish has been challenged for many disks: models over-predict the emission line intensity of some species; namely, they are depleted (with respect to expectations from canonical models). In this review we show how this disparity indicates that dust evolution has signi cant effects on gas chemistry, and may indicate the earliest stages of planet formation.
Key words:  Astrochemistry, Circumstellar matter, Molecular processes, Planetary systems, Planet-disk interactions, Planets and satellites: atmospheres
FundProject:
对原行星盘中易挥发物质缺失问题的简要综述
杜福君*
中国科学院紫金山天文台,南京 210033
摘要:
年轻恒星周围存在盘状的气体和尘埃分布,称为原行星盘,行星在其中形成. 为了认识恒星和行星的形成和演化以及构成行星的原材料,对这些盘的观测是必须的. 数值模型有助于从观测数据提取出重要的物理参数,包括盘的尘埃和气体的质量. 这些参数可以作为进一步模拟的输入参数,预期热化学模拟能复现各种分子的观测数据. 但是,对于许多原行星盘,模型算出的多种分子的发射强度高于观测值. 真实的盘中这些分子的丰度比理论预期低,这是易挥发物质的缺失问题. 本文指出在这个问题上理论与观测的差异意味着尘埃的演化对气体化学有重要影响,提示在这些盘中行星形成的早期阶段已经开始了.
关键词:  天体化学,星周物质、分子光谱,行星系统,行星与盘的相互作用,行星形成
DOI:10.1063/1674-0068/cjcp1911210
分类号: