Modeling the Formation of Disks of Gas and Dust Around Young Stars

模拟年轻恒星周围气体和尘埃盘的形成

• 批准号: 1716259
• 负责人: Zhi-Yun Li
• 金额: $ 35.34万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1716259&HistoricalAwards=false
• 关键词: Modeling; Formation; Disks; Gas; Dust

This astronomy project will use computer models to understand how disks of gas and dust form around very young stars. It is from these disks that planets, like Earth and the other planets in our Solar System, are formed. There is now strong evidence that most, if not all, stars in our Galaxy have their own system of planets. The team at the University of Virginia will use sophisticated computer code that they have been working with for many years to study this process. They will include the effects of "magnetic fields" and "turbulence" in their models. Both are thought to be important processes in space, especially in the large clouds that we know lie between the stars. These clouds collapse under their own weight to form stars and planets. A graduate and an undergraduate student will be involved in this project. The investigators will produce animated movies of disk formation for use in large introductory astronomy classes for non-science majors and will develop activities for a mobile planetarium as part of the "Dark Skies, Bright Kids" program, a science educational activity that targets elementary school students in rural Albemarle County, Virginia.Star-forming cores are observed to be significantly magnetized and magnetic braking has been shown to be capable of suppressing disk formation, leading to the so-called magnetic braking catastrophe. The goal of the proposed program is to determine whether the two leading candidates for averting the catastrophe, non-ideal magnetohydrodynamic (MHD) effects and turbulence, can allow the planet-forming disks to form in the presence of a realistic magnetic field, and whether such disks satisfy the increasingly tight observational constraints set by recent ALMA observations. The proposers will use and further develop a well-tested MHD code known as ZeusTW. In the second part of the project they will use the ENZO adaptive mesh refinement MHD code to synthesize disk formation in isolated cores and in clusters.

这个天文学项目将使用计算机模型来了解年轻恒星周围的气体和尘埃盘是如何形成的。正是从这些圆盘中形成了行星，如地球和我们太阳系中的其他行星。现在有强有力的证据表明，我们银河系中的大多数恒星(如果不是全部)都有自己的行星系统。弗吉尼亚大学的研究小组将使用他们多年来一直在使用的复杂计算机代码来研究这一过程。他们将在他们的模型中考虑“磁场”和“湍流”的影响。这两个过程都被认为是太空中的重要过程，特别是在我们所知的位于恒星之间的大云中。这些云层在自身重量的作用下坍塌，形成恒星和行星。一名研究生和一名本科生将参与这个项目。研究人员将制作用于非科学专业的大型天文学入门课程的圆盘形成的动画电影，并将为流动天文馆开发活动，作为“黑暗的天空，光明的孩子”计划的一部分，这是一项针对弗吉尼亚州阿尔贝马尔县农村小学生的科学教育活动。观察到恒星形成的核心被显著磁化，磁制动被证明能够抑制圆盘形成，导致所谓的磁制动灾难。拟议计划的目标是确定两个避免灾难的主要候选者--非理想磁流体(MHD)效应和湍流--是否能够允许行星形成盘在真实磁场存在的情况下形成，以及这些盘是否满足最近ALMA观测设置的日益严格的观测约束。提出者将使用并进一步开发一种经过良好测试的名为ZeusTW的MHD代码。在项目的第二部分，他们将使用Enzo自适应网格细化MHD代码来合成孤立核心和集群中的磁盘形成。

项目成果

Relative alignment between dense molecular cores and ambient magnetic field: the synergy of numerical models and observations

致密分子核心和环境磁场之间的相对排列：数值模型和观测的协同作用

• DOI: 10.1093/mnras/staa835
• 发表时间: 2020
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Chen, Che-Yu;Behrens, Erica A;Washington, Jasmin E;Fissel, Laura M;Friesen, Rachel K;Li, Zhi-Yun;Pineda, Jaime E;Ginsburg, Adam;Kirk, Helen;Scibelli, Samantha
• 通讯作者: Scibelli, Samantha

Does HL Tau disc polarization in ALMA band 3 come from radiatively aligned grains?

ALMA 带 3 中的 HL Tau 圆盘极化是否来自辐射排列的颗粒？

• DOI: 10.1093/mnras/sty3263
• 发表时间: 2018
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Yang, Haifeng;Li, Zhi-Yun;Stephens, Ian W;Kataoka, Akimasa;Looney, Leslie
• 通讯作者: Looney, Leslie

Magnetic Fields in the Early Stages of Massive Star Formation as Revealed by ALMA

• DOI: 10.3847/1538-4357/ab9087
• 发表时间: 2020-05
• 期刊: The Astrophysical Journal
• 作者: Junhao Liu;Qizhou Zhang;K. Qiu;Hauyu Baobab Liu;T. Pillai;Josep Miquel Girart;Zhi-Yun Li;Ke Wang

Time Evolution of 3D Disk Formation with Misaligned Magnetic Field and Rotation Axes

磁场和旋转轴未对准的 3D 圆盘形成的时间演化

• DOI: 10.3847/1538-4357/ab0307
• 发表时间: 2019
• 期刊: The Astrophysical Journal
• 作者: Väisälä, Miikka S.;Shang, Hsien;Krasnopolsky, Ruben;Liu, Sheng-Yuan;Lam, Ka Ho;Li, Zhi-Yun
• 通讯作者: Li, Zhi-Yun

ALMA Dust Polarization Observations of Two Young Edge-on Protostellar Disks

两个年轻的边缘原恒星盘的 ALMA 尘埃偏振观测

• DOI: 10.3847/1538-4357/aaa769
• 发表时间: 2018
• 期刊: The Astrophysical Journal
• 作者: Lee, Chin-Fei;Li, Zhi-Yun;Ching, Tao-Chung;Lai, Shih-Ping;Yang, Haifeng
• 通讯作者: Yang, Haifeng