Holding footpoints to the fire, planetary disk theory confronts observations

立足于火焰，行星盘理论面对观测结果

• 批准号: 0406823
• 负责人: Alice Quillen
• 金额: --
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-15 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0406823&HistoricalAwards=false
• 关键词: Holding; footpoints; fire; planetary; disk

ABSTRACTPI QuillenThis research is providing a detailed interpretative framework within which sophisticated protoplanetary debris/accretion disk models can be compared with the expanding database of high quality optical, infrared and submillimeter ground based observations, as well as with infrared observations from space. This is enabled by a combination of advanced adaptive mesh numerical tools for magnetohydrodynamics, analytic theory, and Monte Carlo radiative transfer models to produce synthetic scattered light images and spectral energy distributions. There are three separate, but interrelated, lines of inquiry concerning observational diagnostics for disk-planet interaction: 1) radial structure in the form of disk gaps cleared and maintained by proto-planets; 2) azimuthal structure in the form of disk spiral waves/warps excited via embedded planets or external flybys (binary companion, unbound star or brown-dwarf); and 3) vertical structure in the form of disk scale heights as a proxy for protostellar disk turbulence. The disk scale height study will characterize turbulence generated in disks which governs when and how planetesimals accumulate to form planets. Further they are providing observational diagnostics for planets which maintain disk edges, and disk structure truncated by or excited by bound perturbers and stellar flybys. The work provides model predictions for the evolution and shape of proto-planetary systems which then can be tested from the observations of individual objects and the statistics of disks in clusters. Broader Impact: The proposers? efforts to create links between analytic theory, numerical simulations, and observations play directly into their outreach strategy which has both a local and national focus. Their previous outreach efforts have led to the creation of a Rochester-based education and intern program for local high school seniors. They are adding to that here by actively increasing the presence of inner city children in the sciences by involving them directly in their research program. The work is also creating striking visual images and movies that can be used to tell the story of planet formation in ways which can engage both students and non-scientists. They are developing simulation-based web outreach modules distributed on a national level by placing the modules on the websites of major science magazines.

摘要 Quillen 这项研究提供了一个详细的解释框架，在该框架内，可以将复杂的原行星碎片/吸积盘模型与高质量光学、红外和亚毫米地面观测以及来自太空的红外观测的不断扩展的数据库进行比较。这是通过磁流体动力学、分析理论和蒙特卡罗辐射传输模型的先进自适应网格数值工具的组合来实现的，以产生合成的散射光图像和光谱能量分布。关于盘-行星相互作用的观测诊断，存在三个独立但相互关联的研究方向：1）由原行星清除和维持的盘间隙形式的径向结构； 2）通过嵌入式行星或外部飞越（双星伴星、未束缚恒星或棕矮星）激发的圆盘螺旋波/扭曲形式的方位角结构； 3）以盘尺度高度形式的垂直结构作为原恒星盘湍流的代表。圆盘尺度高度研究将表征圆盘中产生的湍流，该湍流控制着星子积聚形成行星的时间和方式。此外，他们还为维持盘边缘的行星以及被束缚扰动物和恒星飞掠所截断或激发的盘结构提供观测诊断。这项工作为原行星系统的演化和形状提供了模型预测，然后可以通过对单个物体的观测和星团中圆盘的统计数据进行测试。更广泛的影响：提案者？在分析理论、数值模拟和观察之间建立联系的努力直接影响到他们以地方和国家为重点的外展战略。他们之前的推广工作导致在罗切斯特为当地高中生创建了一个教育和实习计划。他们还通过让内城儿童直接参与他们的研究项目，积极增加他们在科学领域的参与度。这项工作还创造了引人注目的视觉图像和电影，可以用来以吸引学生和非科学家的方式讲述行星形成的故事。他们正在开发基于模拟的网络推广模块，将这些模块放置在主要科学杂志的网站上，并在全国范围内分发。