Benoît Commerçon, Francesco Lovascio, Elliot Lynch, Enrico Ragusa
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引用次数: 0
摘要
背景最近的观测已经开始探测圆盘形成的早期阶段,但关于0级天体的圆盘结构和形态的数据还很少。通过模拟,我们能够对未来年轻圆盘巡天观测中的圆盘形态做出预测。在这封信中,我们研究了在非理想磁流体力学(MHD)坍缩模拟中形成的星盘的形态,特别是其偏心率。我们试图证明云坍缩形成的圆盘很可能是偏心的。我们在带有辐射传递的自适应网格细化代码 RAMSES 中运行了非理想 MHD 塌陷模拟。我们使用了最先进的分析方法来测量圆盘偏心率。我们发现,尽管初始条件不对称,但形成的圆盘是偏心的,偏心率约为 0.1。这些结果可能会对原行星盘动力学和行星形成产生重要影响。年轻圆盘中存在的偏心现象在圆盘演化的后期阶段是看不到的,这与目前的粘性偏心阻尼模型相矛盾。这意味着环星盘中可能存在一种尚未发现的圆化机制。
Context. 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.Aims. 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.Methods. 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.Results. We find that despite no asymmetry in the initial conditions, the discs formed are eccentric, with eccentricities on the order of 0.1.Conclusions. 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.
期刊介绍:
Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.