跳出磁盘思维

IF 12.9 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Paul Woods
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引用次数: 0

摘要

原行星盘及其环绕的恒星通常被模拟为孤立的系统。然而,在这类星盘周围观测到了延伸的气态结构(例如流线),这表明即使在星盘成熟时,也有来自周围更广泛环境的物质为其提供养料。安德鲁-温特(Andrew Winter)及其同事利用一个简单的模型表明,通过纳入持续吸积的物质,可以很好地再现观测到的圆盘质量、吸积率、半径和寿命。此外,在恒星形成区域的背景下考虑星盘甚至对小尺度也有影响,例如,相对快速移动的恒星从星际介质(ISM)中吸积的质量应该较少,从而影响行星形成的特征。温特等人采用了一个半分析模型,假定低速 ISM 在原行星盘上的邦迪-霍伊尔-莱特尔顿(BHL)吸积期为几百万年(典型的星盘寿命)。该模型通过跟踪单一体积元素上的密度和速度扰动,纳入了从恒星形成区到圆盘大小尺度的湍流级联。这种处理方法意味着,除了恒星质量和年龄之外,磁盘质量、半径和恒星吸积率也是 BHL 吸积率的函数。由于在这种情况下磁盘会不断得到补充,因此它们有可能在其生命周期的后半段吸积大部分质量。吸积还可能驱动外盘的湍流,导致外盘粘度可能扩散几个数量级。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thinking outside the disk
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来源期刊
Nature Astronomy
Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics
CiteScore
19.50
自引率
2.80%
发文量
252
期刊介绍: Nature Astronomy, the oldest science, has played a significant role in the history of Nature. Throughout the years, pioneering discoveries such as the first quasar, exoplanet, and understanding of spiral nebulae have been reported in the journal. With the introduction of Nature Astronomy, the field now receives expanded coverage, welcoming research in astronomy, astrophysics, and planetary science. The primary objective is to encourage closer collaboration among researchers in these related areas. Similar to other journals under the Nature brand, Nature Astronomy boasts a devoted team of professional editors, ensuring fairness and rigorous peer-review processes. The journal maintains high standards in copy-editing and production, ensuring timely publication and editorial independence. In addition to original research, Nature Astronomy publishes a wide range of content, including Comments, Reviews, News and Views, Features, and Correspondence. This diverse collection covers various disciplines within astronomy and includes contributions from a diverse range of voices.
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