arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2407.13484astro-ph.SRastro-ph.EP
收藏

行星和恒星较差旋转的普适规律

A common law for the differential rotation of planets and stars

Vincent G. A. Böning, Johannes Wicht

备注：
7 pages, 5 figures, submitted to A&A Letters
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

AI总结：

本研究通过分析太阳观测及土星和超热木星模拟，发现行星和恒星纬向流动能均遵循 $\ell^{-5}$ 标度，揭示了一种与驱动无关的普适形成机制。

摘要：

所有行星和恒星都在自转。我们太阳系中的所有气态行星、太阳以及许多恒星都呈现出向东或向西的平均流模式。这种现象在恒星背景下被称为较差旋转，在行星背景下被称为纬向射流。观测、实验室实验和模拟表明，纬向流动动能按 $\ell^{-5}$ 标度变化，其中 $\ell$ 是球谐度数（实际上相当于纬向波数）。在此，我们分析了太阳的观测数据，以及对土星和一颗超热木星外层大气的动力学模拟。尽管这些系统差异巨大，但它们都发展出遵循 $\ell^{-5}$ 标度的强纬向风。我们的结果强烈表明，存在一种简单的共同机制，塑造了行星和恒星中的纬向平均流，且与流动驱动方式无关。

英文摘要：

All planets and stars rotate. All gas planets in our solar system, the Sun, and many stars show a pattern of east- or westward mean flows. This phenomenon is known as differential rotation in the stellar and as zonal jets in the planetary context. Observations, laboratory experiments and simulations show that the zonal flow kinetic energy scales like $\ell^{-5}$, where $\ell$ is the spherical harmonic degree (which is effectively a latitudinal wave number). Here, we analyze observation of the Sun, as well as simulations of the dynamics in Saturn and in the outer atmosphere of an ultra-hot Jupiter. While these systems are very different, they all develop strong zonal winds that obey the $\ell^{-5}$ scaling. Our results strongly suggest that there is a simple common mechanism that shapes zonal mean flows in planets and stars independent of the flow driving.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑