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arXiv 2408.16319astro-ph.SRastro-ph.EPastro-ph.GA
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盘天生是偏心的

Discs are born eccentric

Benoit Commerçon, Francesco Lovascio, Elliot Lynch, Enrico Ragusa

备注：
accepted for publication in Astronomy & Astrophysics, 7 pages, 8 figures
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AI总结：

本研究通过非理想MHD坍缩模拟预测早期原行星盘天生具有约0.1的偏心率，揭示了现有偏心率阻尼模型存在的矛盾，并暗示星周盘中存在未知的圆化机制。

摘要：

最近的观测已经开始探测原行星盘形成的早期阶段，但关于Class 0天体的盘结构和形态的数据仍然很少。通过模拟，我们能够对未来年轻盘的观测巡天中预期的盘形态做出预测。基于对核心坍缩导致的从头计算恒星形成的详细模拟，我们预测早期盘必须是偏心的。在这封信中，我们研究了形态，特别是非理想磁流体力学（MHD）坍缩模拟中形成的盘的偏心率。我们试图证明由云坍缩形成的盘很可能是偏心的。我们在带有辐射传输的自适应网格细化代码RAMSES中运行了非理想MHD坍缩模拟。我们使用了最先进的分析方法来测量盘的偏心率。我们发现，尽管初始条件中没有不对称性，但形成的盘是偏心的，偏心率约为0.1。这些结果可能对原行星盘动力学和行星形成具有重要意义。在年轻盘中存在但在盘演化的后期阶段未观察到的偏心率，与当前的粘性偏心率阻尼模型存在矛盾。这意味着在星周盘中可能存在一种尚未被发现的圆化机制。

英文摘要：

Recent observations have begun probing the early phases of disc formation, but little data yet exists on disc structure and morphology of Class 0 objects. Using simulations, we are able to lay out predictions of disc morphologies expected in future surveys of young discs. Based on detailed simulations of ab initio star formation by core collapse, we predict that early discs must be eccentric. In this letter, we study the morphology and, in particular, the eccentricity of discs formed in non-ideal magnetohydrodynamic (MHD) collapse simulations. We attempt to show that discs formed by cloud collapse are likely to be eccentric. We ran non-ideal MHD collapse simulations in the adaptive mesh refinement code RAMSES with radiative transfer. We used state-of-the-art analysis methods to measure the disc eccentricity. We find that despite no asymmetry in the initial conditions, the discs formed are eccentric, with eccentricities on the order of 0.1. These results may have important implications for protoplanetary disc dynamics and planet formation. The presence of eccentricity in young discs that is not seen at later stages of disc evolution is in tension with current viscous eccentricity damping models. This implies that there may be an as-yet undiscovered circularisation mechanism in circumstellar discs.

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。

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