嵌套盘中早期行星形成（eDisk）。XVIII. IRAS 16544-1604 在 CB 68 中的原恒星盘尘-连续体发射中可能存在的螺旋结构迹象
Early Planet Formation in Embedded Disks (eDisk). XVIII. Indication of a possible spiral structure in the dust-continuum emission of the protostellar disk around IRAS 16544-1604 in CB 68
AI总结：
通过数值模拟和辐射传输计算，研究了原恒星盘尘-连续体发射中不对称肩部特征的成因，揭示了引力不稳定性可能影响螺旋结构的可见性。
摘要：
我们进行了数值模拟并结合辐射传输计算，以重现一个引人入胜的不对称肩部特征在原恒星盘的尘-连续体发射中。这是我们的第一次尝试将原恒星盘演化的理论工作与eDisk观测结合起来。我们发现虽然我们的流体动力学模拟由于引力不稳定性形成螺旋结构，但当盘倾斜并与望远镜束卷积后，这些结构变得不那么容易辨认。通过我们的数值模拟获得的螺旋结构宽度约为eDisk束大小4.5 au的0.1-0.8倍。我们的建模努力表明，eDisk观测中螺旋特征的明显缺失并不一定意味着内部亚结构和引力不稳定性的真实缺失。我们还发现，当盘质量足够大，Toomre参数Q~1时，沿主轴的连续体轮廓出现不对称肩部结构。这种机制为IRAS 16544-1604周围以及其它eDisk源周围的观察到的不对称肩部特征提供了潜在的解释。
英文摘要：
We performed numerical simulations along with radiative transfer calculations to reproduce an intriguing asymmetric shoulder feature in the dust-continuum emission of the protostellar disk around one of the eDisk targets, the Class 0 protostar IRAS 16544-1604 in CB 68. This is our first attempt to bridge the theoretical works of protostellar disk evolution and the eDisk observations. We found that while our hydrodynamic simulations form spiral structures caused by gravitational instability, they become less discernible after the disk is inclined and convolved with the telescope beam. The widths of the spiral structure as obtained by our numerical simulations are ~0.1-0.8 times the eDisk beam size of 4.5 au. Our modeling effor implies that the apparent absence of spiral features in the eDisk observations does not necessarily indicate the real absence of internal substructures and gravitational instability. We also found that the asymmetric shoulder structure of the continuum profile along the major axis appears when the disk is massive enough with a Toomre parameter Q~1. This mechanism offers a potential explanation for the observed, asymmetric shoulder features in the disks surrounding IRAS 16544-1604 and the other eDisk sources.
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。
