A Self-Consistent Bayesian Investigation of Star Cluster Binary Populations

星团二元群的自洽贝叶斯研究

• 批准号: 2107738
• 负责人: Aaron Geller
• 金额: $ 61.81万
• 依托单位: Northwestern University
• 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=2107738&HistoricalAwards=false
• 关键词: Self; Consistent; Bayesian; Investigation; Star

About 2/3 of the stars in our galaxy reside in close pairs, called “binary stars”. Many of these stars are born within larger families known as “star clusters”. Yet despite how common and important binary stars are, vital questions remain. The investigator will use newly available observations and state-of-the-art software to produce a large database of the empirical properties of binary stars and their host star clusters. The investigator will then use this database to examine theoretical predictions. This database will be made publicly available through a custom website and will enable many follow-up studies by the astronomical community. The investigator will also mentor up to nine undergraduate. Each student will learn skills in research methods, coding, data analysis, and web development. The investigator will help to advance a more diverse, sophisticated, and highly competitive STEM workforce.The investigator and his team will self-consistently characterize the binary star populations in hundreds of open star clusters, across a wide range of cluster properties, using a Bayesian Analysis of Stellar Evolution (BASE-9) tool. For each cluster, the investigator will compile available photometry from Gaia, 2MASS and Pan-STARRS, and use these data within the BASE-9 software to (a) identify photometric binaries and determine their masses and mass ratios, (b) establish the cluster age, distance, reddening and metallicity, and (c) derive star-by-star photometric membership probabilities and masses. The investigator will use this database to examine predicted trends in binary frequency and mass-ratio distribution across different clusters (as functions of, e.g., age, metallicity, density, cluster mass, etc.) as predicted by stellar dynamical and star formation models, and within each individual cluster (e.g., as a function of distance from the cluster center) as predicted by two-body relaxation and mass segregation effects. The investigator will also develop a custom online interactive table and plotting utility that will provide public access to this database of binary and cluster parameters. Most students working with the investigator will be recruited from the Chicago area through an existing network that the investigator has developed as part of the NSF-funded Research Experiences for Undergraduates (REU) program he directs at Northwestern. In addition to the directed research projects, these students will also create their own research websites and help to develop the interactive website that will host the binary star and star cluster database. Over the summer, each student will be fully integrated into Northwestern’s astrophysics REU program, which provides numerous professional development workshops, including coding and high-performance computing, science communication and career planning discussions.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.

我们银河系中约有2/3星的近距离居住，被称为“二进制恒星”。这些星星中有许多是在被称为“星团”的较大家庭中出生的。然而，仍然希望二进制恒星的普遍和重要问题，仍然存在重要的问题。研究人员将使用新可用的观测值和最先进的软件来生成二进制恒星及其宿主星团簇的经验特性的大数据库。然后，研究者将使用此数据库来检查理论预测。该数据库将通过自定义网站公开可用，并将实现天文学界的许多后续研究。调查人员还将指导多达9个本科生。每个学生将学习研究方法，编码，数据分析和Web开发方面的技能。调查人员将有助于推进更多样化，成熟和竞争激烈的STEM劳动力。调查员和他的团队将使用贝叶斯对恒星进化（Base-9）工具的贝叶斯分析，以数百个开放型星团的二元星级人群为特征。 For each cluster, the investigator will compile available photometry from Gaia, 2MASS and Pan-STARRS, and use these data within the BASE-9 software to (a) identify photometric binaries and determine their masses and mass ratios, (b) establish the cluster age, distance, redding and metallicity, and (c) derive star-by-star photometric membership possibilities and masses. The investigator will use this database to examine predicted trends in binary frequency and mass-ratio distribution across different clusters (as functions of, e.g., age, metallicity, density, cluster mass, etc.) as predicted by stellar dynamical and star formation models, and within each individual cluster (e.g., as a function of distance from the cluster center) as predicted by two-body relaxation and mass segregation effects.研究者还将开发一个自定义的在线交互式表和绘制实用程序，该表将为该数据库提供二进制和群集参数数据库的访问。大多数与调查员一起工作的学生都将通过现有网络从芝加哥地区招募，该网络是调查员开发的，这是他在西北地区指导的NSF资助的本科生（REU）计划的一部分。除了定向研究项目外，这些学生还将创建自己的研究网站，并有助于开发将托管二进制明星和星团数据库的交互式网站。在整个夏季，每个学生都将完全融入西北的天体物理REU计划，该计划提供了许多专业发展研讨会，包括编码和高性能计算，科学沟通和职业计划讨论。该奖项反映了NSF的法定任务，并且我们是否通过使用该基金会的知识分子优点和广泛的影响来评估我们的支持。

项目成果

Coplanar Circumbinary Planets Can Be Unstable to Large Tilt Oscillations in the Presence of an Inner Polar Planet

当存在内极行星时，共面双星行星可能会因大倾斜振荡而不稳定

• DOI: 10.3847/2041-8213/acbcc9
• 发表时间: 2023
• 期刊: The Astrophysical Journal Letters
• 作者: Childs, Anna C.;Martin, Rebecca G.;Lepp, Stephen;Lubow, Stephen H.;Geller, Aaron M.
• 通讯作者: Geller, Aaron M.

Composition constraints of the TRAPPIST-1 planets from their formation

TRAPPIST-1 行星形成过程中的成分限制

• DOI: 10.1093/mnras/stad2110
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Childs, Anna C.;Shakespeare, Cody;Rice, David R.;Yang, Chao-Chin;Steffen, Jason H.
• 通讯作者: Steffen, Jason H.