Collaborative Research: Protostellar Jets Across the Mass Spectrum

合作研究：跨质谱的原恒星喷流

• 批准号: 1910675
• 负责人: Jonathan Tan
• 金额: $ 26.05万
• 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: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1910675&HistoricalAwards=false
• 关键词: Collaborative; Research; Protostellar; Jets; Across

Stars, like our Sun, are known to form from clouds of molecular gas in interstellar space. These clouds gradually collapse under the influence of gravity, becoming denser and smaller. As this happens, any initial spin of the cloud is amplified, much like when an ice skater pulls their arms in to spin faster. This occurs because of a phenomenon known as the conservation of angular momentum. However, if material that was to form a star fully conserved its angular momentum, i.e., its degree of spin, then by the time it became as small as a star it would be spinning so quickly that it would no longer be stable and would be flung apart. The answer to this riddle of how stars like our Sun have been able to form, requiring quite low rates of spin, is thought to be related to the phenomenon of "Protostellar Jets", which is the subject of this research. Fast flowing gas, collimated into a pair of jets, is almost always seen when young stars are forming, i.e., when they are "protostars". These jets are thought to be launched from a spinning gas disk that surrounds the growing star because of the action of magnetic fields threading the disk that become wound up by the swirling gas. These magnetic fields are thought to become powerful enough to launch some of the gas from the disk, which carries away angular momentum from material left behind that can then eventually settle on to the star. The remnants of such disks may become systems of planets, like those of our solar system. The investigators seek to understand how stars and planets are born by better understanding how protostellar jets are launched. The investigators will perform computer simulations of protostellar jets understand their properties, including from relatively low-mass stars like our Sun, to much more massive stars that also exist in our Galaxy. The results of these simulations will be compared to observations of protostellar jets made by radio telescopes to test the theoretical simulations.The broader impact plan integrates research with teaching and public outreach activities. At the University of the Virgin Islands (UVI) three undergraduates will share in the research projects each year, providing important opportunities for STEM career development for underrepresented groups. This proposal will help strengthen a collaboration between this new research group at UVI and the University of Virginia (UVA). The collaboration plan includes student exchanges between UVI and UVA, expanding the horizons of both groups.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.

众所周知，恒星，就像我们的太阳一样，是由星际空间中的分子气体云形成的。这些云在重力的影响下逐渐塌陷，变得更密、更小。当这种情况发生时，云的任何初始旋转都会被放大，就像滑冰者拉动手臂以加快旋转速度一样。这是由于一种称为角动量守恒的现象而发生的。然而，如果形成恒星的物质完全守恒其角动量，即它的自旋程度，那么当它变得像恒星一样小时，它会旋转得如此之快，以至于不再稳定，并且会变得不稳定。被甩开。像我们的太阳这样的恒星是如何在需要相当低的自转速率的情况下形成的这个谜题的答案被认为与“原恒星喷流”现象有关，这是本研究的主题。当年轻恒星形成时，即当它们是“原恒星”时，几乎总是可以看到快速流动的气体，准直成一对喷流。这些喷流被认为是从围绕正在生长的恒星的旋转气盘中发射出来的，因为磁场穿过气盘，并被旋转的气体缠绕。人们认为这些磁场的强度足以从圆盘中发射出一些气体，这些气体带走了留下的物质的角动量，这些物质最终可以沉积在恒星上。这些圆盘的残余物可能会成为行星系统，就像我们太阳系的行星系统一样。 研究人员试图通过更好地了解原恒星喷流的发射方式来了解恒星和行星是如何诞生的。研究人员将对原恒星喷流进行计算机模拟，了解它们的特性，包括从像太阳这样质量相对较低的恒星到银河系中也存在的质量大得多的恒星。这些模拟的结果将与射电望远镜对原恒星喷流的观测进行比较，以测试理论模拟。更广泛的影响计划将研究与教学和公共宣传活动结合起来。在维尔京群岛大学 (UVI)，三名本科生每年将参与研究项目，为弱势群体的 STEM 职业发展提供重要机会。该提案将有助于加强 UVI 新研究小组与弗吉尼亚大学 (UVA) 之间的合作。 该合作计划包括 UVI 和 UVA 之间的学生交流，扩大了两个团体的视野。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Disk Wind Feedback from High-mass Protostars. II. The Evolutionary Sequence

来自高质量原恒星的盘风反馈。

• DOI: 10.3847/1538-4357/acbd47
• 发表时间: 2023-04
• 期刊: The Astrophysical Journal
• 作者: Staff, Jan E.;Tanaka, Kei E. I.;Ramsey, Jon P.;Zhang, Yichen;Tan, Jonathan C.
• 通讯作者: Tan, Jonathan C.