论文标题
通过在磁盘进化的早期盘中凝结灰尘凝结物周围的灰尘聚集体的形成环
Ring formation by coagulation of dust aggregates in early phase of disk evolution around a protostar
论文作者
论文摘要
通过（亚）毫米灰尘连续发射从0级和I级的早期到II级年轻恒星对象（YSOS）的（YSOS）的（YSOS）的（YSOS），观察到环结构。在本文中，我们研究了早期阶段这种环形成的可能方案之一，即灰尘聚集体的凝结。灰尘晶粒以内而外的方式生长，因为生长时间尺度与轨道时期大致成正比。尘埃演化的边界可以被视为生长时代的生长阵线，其中生长时间与磁盘年龄相当。通过基于灰尘凝结模型的辐射转移计算，我们发现可以将生长锋视为环结构，因为在该位置下尘埃表面密度急剧变化。此外，我们确认在ysos中观察到的环形位置为$ \ lyssim1 $ myr与增长方面一致。在磁盘演化的早期阶段（例如0和I类）来源的早期阶段，创建环结构可能很重要。
Ring structures are observed by (sub-)millimeter dust continuum emission in various circumstellar disks from early stages of Class 0 and I to late stage of Class II young stellar objects (YSOs). In this paper, we study one of the possible scenarios of such ring formation in early stage, which is coagulation of dust aggregates. The dust grains grow in an inside-out manner because the growth timescale is roughly proportional to the orbital period. The boundary of the dust evolution can be regarded as the growth front, where the growth time is comparable to the disk age. With radiative transfer calculations based on the dust coagulation model, we find that the growth front can be observed as a ring structure because dust surface density is sharply changed at this position. Furthermore, we confirm that the observed ring positions in the YSOs with an age of $\lesssim1$ Myr are consistent with the growth front. The growth front could be important to create the ring structure in particular for early stage of the disk evolution such as Class 0 and I sources.
