用环带盘确定行星形成的基本参数
Using Ringed Disks to Determine Fundamental Parameters of Planet Formation
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中文总结 AI 辅助
本研究将Lee（2024）的环带盘模型应用于已知环带盘普查，在10个系统中发现19个可行环，推导得到行星形成早期的St和α参数，相关结果支持环由行星生成的推测。
中文摘要 AI 辅助
斯托克斯数（St）和湍流α这两个无量纲参数对行星形成的早期阶段起着关键控制作用。尽管它们十分重要，但这两个数却极难获取，除环带盘外大多仍未得到约束。E. J. Lee（2024）指出，可通过结合尘埃径向运动方程与0/I型星周盘尘埃质量分布的简单模型，利用环带盘唯一推导局域St和α。我们将该模型应用于目前已知的环带盘普查结果，在10个系统中发现19个可行环，使样本量较此前翻倍。与此前研究结果类似，我们在广泛的系统参数范围内得到St约为10⁻⁴至10⁻²、α约为10⁻⁵至10⁻²，这与我们研究的所有盘富含气体、环的尘埃气质量比过低无法产生星子的结论一致。若环由行星生成，低质量主星周围的盘可能具有更易泄漏的捕获结构，这与低质量主星周围巨行星（能清除间隙）罕见的情况大致相符。
英文摘要
Two non-dimensional parameters, Stokes number (St) and turbulent $α$, critically control the early stage of planet formation. In spite of their importance, these two numbers are notoriously difficult to obtain and remain largely unconstrained, except in ringed disks. In particular, E. J. Lee (2024) showed that ringed disks can be uniquely leveraged to derive local St and $α$ through a simple model combining dust radial equation of motion with the measured distribution of dust masses in Class 0/I disks. We apply their model to the currently known census of ringed disks, finding 19 viable rings in 10 systems, which more than doubles the previous sample. Similar to previous findings, we obtain generally low St$\sim 10^{-4}$--$10^{-2}$ and $α\sim 10^{-5}$--10$^{-2}$ across a wide range of system parameters, consistent with all the disks that we study to be rich in gas and the dust-to-gas ratio of the rings to be too low to generate planetesimals. Disks around low mass host stars likely have leakier traps, broadly consistent with massive, gap-carving giants to be rare around low mass hosts, if the rings are generated by planets.
发表机构
- University of California, San Diego（加州大学圣地亚哥分校）
- PhysicsGraph
- McGill University（麦吉尔大学）
机构由 AI 辅助整理，请以论文原文为准。
