Dust Distribution and Planet Migration in Magnetized Protostellar Disks

磁化原恒星盘中的尘埃分布和行星迁移

• 批准号: 0908184
• 负责人: Arieh Konigl
• 金额: $ 29.09万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-06-01 至 2014-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0908184&HistoricalAwards=false
• 关键词: Dust; Distribution; Planet; Migration; Magnetized

In this study, Dr. Arieh Konigl will undertake a detailed theoretical investigation of accretion disks around young stellar objects (YSOs). In this context, accretion means that material is flowing through the disk and landing on the young star. The current astrophysical understanding is that most of the mass assembled in YSOs passes through such disks and that protostellar disks are the incubators of planets. Energetic, collimated outflows (jets) are also a ubiquitous feature of YSOs, and there is strong evidence that they are intimately linked to the accretion process. Planets are believed to form in protostellar disks through the gradual growth of dust grains into planetesimals. The aim of this work is to investigate the possibility that the presence of a large-scale magnetic field in the disk is key for understanding several aspects of star formation, including the production and evolution of jets, the transfer of angular momentum (spin) outward in the disk, and the migration of early planets within the disk. Building on extensive previous modeling work by the PI on the formation of stars, this work will generate self-consistent calculations of the global dust distribution in a magnetized, wind-driving disk, create spectral and imaging diagnostics of the dust and gas distributions in the disk/wind system for testing against existing and future observations, and explore the possible reduction of inward planet migration by the effect of alarge-scale magnetic field on the disk's response to the gravitational perturbation induced by the planet's circular motion.The implications of the planned studies to the formation of the solar system and of extrasolar planets should elicit wide interest and will be broadly disseminated, including in public lectures by the PI. The PI and his students will also continue work with K-12 students and teachers in inner-city schools.

在这项研究中，Arieh Konigl博士将对年轻恒星物体（yso）周围的吸积盘进行详细的理论研究。在这种情况下，吸积意味着物质流过圆盘并落在年轻的恒星上。目前天体物理学的理解是，聚集在yso中的大部分质量都经过这样的圆盘，而原恒星盘是行星的孵化器。高能的、准直的喷流（喷流）也是YSOs普遍存在的特征，并且有强有力的证据表明它们与吸积过程密切相关。行星被认为是在原恒星盘中通过尘埃颗粒逐渐成长为星子而形成的。这项工作的目的是研究盘中存在大规模磁场的可能性，这是理解恒星形成的几个方面的关键，包括喷流的产生和演化，盘中角动量（自旋）向外转移，以及盘内早期行星的迁移。在PI之前对恒星形成的广泛建模工作的基础上，这项工作将产生自一致的全球尘埃分布计算，在磁化的风力驱动的磁盘中，创建磁盘/风系统中尘埃和气体分布的光谱和成像诊断，以测试现有和未来的观测结果。并探讨了大尺度磁场对行星圆周运动引起的引力扰动的响应的影响，从而可能减少行星向内迁移。计划中的研究对太阳系和太阳系外行星形成的影响应引起广泛的兴趣，并将广泛传播，包括在PI的公开讲座中。PI和他的学生还将继续与市中心学校的K-12学生和教师合作。