跳出磁盘思维

IF 12.9 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Nature Astronomy Pub Date : 2024-09-12 DOI:10.1038/s41550-024-02374-w

Paul Woods

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。

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来源期刊

Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics

CiteScore

19.50

自引率

2.80%

发文量

252

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