Connecting Magnetic Fields From Molecular Clouds to Protostellar Systems: The Multiscale Behaviors in Star-Forming Regions

连接磁场从分子云到原恒星系统：恒星形成区域的多尺度行为

• 批准号: 1815784
• 负责人: Zhi-Yun Li
• 金额: $ 39.03万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1815784&HistoricalAwards=false
• 关键词: Connecting; Magnetic; Fields; Molecular; Clouds

The investigators will simulate the effect of magnetic fields on the stars forming in interstellar clouds. These clouds are the birthplace of stars. The investigators will compare their theoretical results with recent observations, with the aim of understanding the importance of magnetic fields in controlling the birth of stars. Their results will also help us understand origin of our solar system. The team plans a range of educational and outreach activities. For example, they plan to animate movies of their star formation models, for use in public talks and astronomy classes. This program will also support and train women scientists during the early phase of their careers.The investigators will carry out a series of three-dimensional magneto-hydrodynamic simulations to follow the evolution of the magnetic field structure on a range of scales, from the interstellar clouds to proto-stellar systems. They will make theoretical predictions of the dust polarization based on the simulations. They will compare their predictions to observational data from the several experiments, including the Balloon-borne Large Aperture Submillimeter Telescope for Polarimetry (BLASTPol), and the Atacama Large Millimeter/submillimeter Array (ALMA), and future data from NSF-funded TolTEC instrument on the 50-meter Large Millimeter Telescope (LMT). The goal is to determine the strength of the magnetic field in the interstellar clouds and its role in the formation of stars. A salient feature of the proposed program is the close collaboration between theorists who perform cutting-edge computer simulations and observers who are leading the effort to produce the most detailed polarization maps of star-forming clouds using BLASTPol and TolTEC on LMT. Through the most comprehensive comparison between theory and observation, the team will test their models for the role of magnetic fields in star formation.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.

研究人员将模拟磁场对星际云中形成的恒星的影响。这些云是星星的发源地。研究人员将将他们的理论结果与最近的观察结果进行比较，以了解磁场在控制恒星诞生中的重要性。 他们的结果还将帮助我们了解太阳系的起源。该团队计划一系列教育和外展活动。例如，他们计划使他们的星形组模型的电影动画，以供公众演讲和天文学课。该计划还将在其职业生涯的早期阶段支持和培训女性科学家。研究人员将进行一系列三维磁磁动力模拟，以遵循从星际云到原始系统的一系列尺度上的磁场结构的演变。他们将根据模拟对灰尘极化做出理论预测。 他们将将自己的预测与来自几个实验的观察数据进行比较，包括气球播放的大量孔径超毫升望远镜（BLASTPOL）和ATACAMA大毫米/亚毫米/亚毫米阵列（Alma），以及NSF资助的50米大毫升毫米型号的NSF资助的Toltec仪器的未来数据。目的是确定星际云中磁场的强度及其在恒星形成中的作用。该计划的一个显着特征是执行尖端计算机模拟的理论家与观察者之间的密切合作，他们正在努力使用BlastPol和Toltec在LMT上制作恒星形成云的最详细的极化图。通过理论与观察之间的最全面比较，该团队将测试其模型，以表明磁场在星形形成中的作用。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响审查标准，认为值得通过评估来获得支持。

项目成果

The Davis–Chandrasekhar–Fermi method revisited

重新审视戴维斯·钱德拉塞卡·费米方法

• DOI: 10.1093/mnras/stac1417
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Chen, Che-Yu;Li, Zhi-Yun;Mazzei, Renato R;Park, Jinsoo;Fissel, Laura M;Chen, Michael C-Y;Klein, Richard I;Li, Pak Shing
• 通讯作者: Li, Pak Shing

Multi-scale Dust Polarization and Spiral-like Stokes-I Residual in the Class I Protostellar System TMC-1A

I类原恒星系统TMC-1A中的多尺度尘埃偏振和螺旋状Stokes-I残差

• DOI: 10.3847/1538-4357/ac15f3
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Aso, Yusuke;Kwon, Woojin;Hirano, Naomi;Ching, Tao-Chung;Lai, Shih-Ping;Li, Zhi-Yun;Rao, Ramprasad
• 通讯作者: Rao, Ramprasad

Disc formation in magnetized dense cores with turbulence and ambipolar diffusion

湍流和双极扩散下磁化致密核心中圆盘的形成

• DOI: 10.1093/mnras/stz2436
• 发表时间: 2019
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Lam Ka Ho;Li Zhi-Yun;Chen Che-Yu;Tomida Kengo;Zhao Bo
• 通讯作者: Zhao Bo

Dust Polarization in Four Protoplanetary Disks at 3 mm: Further Evidence of Multiple Origins

• DOI: 10.3847/2041-8213/ab1e46
• 发表时间: 2019-05
• 期刊: The Astrophysical Journal Letters
• 作者: Rachel E. Harrison;L. Looney;I. Stephens;Zhi-Yun Li;Haifeng Yang;A. Kataoka;R. Harris;W. Kwon;T. Muto;M. Momose

The transition of polarized dust thermal emission from the protostellar envelope to the disc scale

偏振尘埃热发射从原恒星包层到盘尺度的转变

• DOI: 10.1093/mnras/stab2105
• 发表时间: 2021
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Lam, Ka Ho;Chen, Che-Yu;Li, Zhi-Yun;Yang, Haifeng;Cox, Erin G;Looney, Leslie W;Stephens, Ian
• 通讯作者: Stephens, Ian