Vortices in Protoplanetary Disks: Their Role in Angular Momentum Transport and Planetesimal Formation

原行星盘中的涡旋：它们在角动量传输和星子形成中的作用

• 批准号: 0098465
• 负责人: Philip Marcus
• 金额: $ 26.28万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-15 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0098465&HistoricalAwards=false
• 关键词: Vortices; Protoplanetary; Disks; Their; Role

" Vortices in Protoplanetary Disks: Their Role in Angular Momentum Transport and Planetesimal Formation "AST- 0098465From local observation, it is known that the Sun and the solar system have effectively the same age and that both are likely to have formed through the collapse of a protostellar disk of dust and gas. While infalling material is necessary for the collapse to take place, angular momentum must at the same time be transported outwards if a stable star is to be formed. As a prelude to planet formation, a mechanism must be found that will build kilometer-sized planetesimals from sub-centimeter sized dust grains. During the period of this award, both problems will be addressed by postulating that the formation of small vortices could simultaneously produce the necessary mass and momentum transport for star formation and at the same time be sweeping dust into their interiors where it can settle and form planetesimals. Following on from the work he has done in explaining the structures which are seen in the atmosphere of the planet Jupiter, the PI and his students will be adapting his mathematical procedures to a study of protoplanetary disks, which, he believes, are unlikely to be either featureless, laminar or filled with homogeneous turbulence. He expects to show that small vortices are likely to thrive in such a disk and that they, rather than large-scale turbulence are likely to be responsible for transport within a cool protoplanetary disk. These same vortices are able to entrap the dust grains and aid planetesimal formation.

“原月球磁盘的涡流：它们在角动量传输和行星形成中的作用” AST- 0098465从局部观察到，众所周知，太阳和太阳系有效地年龄相同，并且两者都可能通过尘埃和气体的尘埃倒塌而形成。虽然崩溃需要插入材料，但如果要形成稳定的恒星，则必须同时将角动量向外传输。作为行星形成的前奏，必须找到一种机制，该机构将建立从次级中心大小的尘埃谷物中建立公里大小的行星。在该奖励期间，这两个问题都将通过假设小型涡流的形成可以同时产生必要的质量和动量运输，以进行恒星形成，同时将灰尘扫到他们的室内装饰中，在那里它可以沉降并形成行星。从他的工作中，他在解释木星气氛中看到的结构所做的工作之后，Pi和他的学生将把他的数学程序调整为对原行星磁盘的研究，他认为，该磁盘不可能是无与伦比的，laminar，或者是均匀的，或填充同质性的。他希望表明，小涡流可能会在这样的磁盘中蓬勃发展，并且它们，而不是大规模的湍流可能是造成凉爽的原始磁盘内运输量的原因。这些相同的涡旋能够诱捕尘埃颗粒和帮助地球的辅助。