Collaborative Research: Early Planet Formation in Embedded Disks

合作研究：嵌入式磁盘中的早期行星形成

• 批准号: 2107841
• 负责人: Jonathan Williams
• 金额: $ 34.33万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2107841&HistoricalAwards=false
• 关键词: Collaborative; Research; Early; Planet; Formation

As astronomers observe more and more dusty proto-stellar disks, a fuller understanding of the process of planetary formation becomes possible. This work is to explore an entirely new method of determining structures in proto-planetary disks. The team will map out concentrations of carbon and oxygen isotopes using spectroscopic imaging of CO isotopologues. The team will conduct a spectroscopic study of existing ALMA observations as well as new observations to be made by the team. They will examine structures such as spirals, gaps and rings. They will also determine the gas composition of young proto-stellar disks, the evolution of composition through different phases of disk evolution and determine the mass of the central protostar. The results of this work will provide new observational constraints for models of planetary formation. Two PhD theses will be completed under this program, both by students from under-represented groups. This program will also support Hawaiian native undergraduate students for summer research work both in analysis and in hardware development. Outreach activities include public talks and summer camp programs for high-school students.The team will use a self-developed state-of-the-art modeling code called Protoplanetary Disks and Stars with Python (pdspy) to extract structural information about protoplanetary disks from multispectral ALMA imaging. The pdspy code models multi-wavelength observational datasets, particularly ALMA images like those to be obtained through the team’s ALMA Large Program, with full radiative transfer models of physically motivated Keplerian disk + rotating collapsing envelope systems using Bayesian parameter estimation methods such as Markov Chain Monte Carlo or Nested Sampling to rigorously sample parameter space. The team will observe and study protoplanetary disks at different points in disk formation and evolution, from initial formation into the T Tauri phase of protostellar development.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

随着天文学家观察到越来越多的尘土飞扬的原始磁盘，人们对行星形成过程的更深刻理解变得可能成为可能。这项工作是探索一种确定原始磁盘中结构的全新方法。该团队将使用CO同位素的光谱成像来绘制碳和氧同位素的浓度。该团队将对现有的ALMA观察以及团队要进行的新观察进行光谱研究。他们将检查诸如精神，差距和戒指之类的结构。他们还将确定年轻原始磁盘的气体组成，即通过磁盘进化的不同阶段组成的演变，并确定中央原恒星的质量。这项工作的结果将为行星形成模型提供新的观察性约束。这项计划将完成两个博士学位论文，包括来自代表性不足的小组的学生。该计划还将为夏季本科生提供分析和硬件开发领域的夏季研究工作。外展活动包括公众会谈和针对高中生的夏令营计划。该团队将使用一种称为Protopplanetary Disk的自发最先进的建模代码和带有Python（PDSPY）的星星来提取来自多光谱Alma Imaging的协议网络磁盘的结构信息。 PDSPY代码模型多波长观察数据集，尤其是通过团队的Alma大型程序获得的ALMA图像，具有全面动机的Keplerian Disk +旋转折叠式包膜系统的完整辐射转移模型，该模型使用贝叶斯参数估计方法，例如Markov Carlo Monte Carlo Monte carlo或嵌套采样或嵌套采样的样品参数。该团队将在磁盘形成和进化的不同点观察和研究方案行行磁盘，从初始形成到ProtoStellar开发的T Tauri阶段。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛的审查标准来通过评估来获得的支持。