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.

“Vortices in Protoplanetary Duplex：Their Role in Angular Momentum Transport and Planetesimal Formation“AST-0098465从当地的观测来看，太阳和太阳系实际上有着相同的年龄，两者都可能是通过尘埃和气体的原恒星盘的坍缩而形成的。虽然坍缩发生需要下落的物质，但如果要形成稳定的星星，角动量必须同时向外传输。作为行星形成的前奏，必须找到一种机制，从亚厘米大小的尘埃颗粒中建造出更大尺寸的星子。在这个奖项期间，这两个问题都将通过假设小涡旋的形成可以同时产生星星形成所需的质量和动量传输，同时将尘埃扫入它们的内部，在那里它可以沉降并形成星子来解决。继他在解释木星大气层结构方面所做的工作之后，PI和他的学生将调整他的数学程序来研究原行星盘，他认为，这不太可能是无特征的，层流或充满均匀湍流。他希望能证明，在这样一个圆盘中，小漩涡很可能会蓬勃发展，而且它们，而不是大规模的湍流，很可能是在一个冷却的原行星圆盘中传输的原因。这些漩涡能够捕获尘埃颗粒，并帮助微行星的形成。