论文标题
没有证据表明谷物生长显着，而是在I类Protostar L1489 IRS周围的磁盘中暂时发现磁盘子结构
No evidence of the significant grain growth but tentative discovery of disk substructure in a disk around the Class I Protostar L1489 IRS
论文作者
论文摘要
为了揭示植物形成的第一步，重要的是要了解尘土周围的磁盘如何以及何时在原恒星周围变大。为了研究谷物的生长，我们分析了围绕I类Protostar周围的磁盘的粉尘连续发射，L1489 IRS的0.9和1.3毫米波长由Atacama大毫米/亚毫米阵列获得。灰尘连续发射延伸至$ r \ sim300 $ au的磁盘半径（$ r $），并且在半径为$ r \ sim100-300 $ au的半径上，光谱指数（$α$）的频谱指数（$α$）与$α\ sim3.6 $相似。因此，在外磁盘（$ r \ sim100-300 $ au）中，谷物生长不会显着发生。此外，即使空间分辨率和敏感性不足以确定此结构，我们暂定以$ r \ sim90 $ au的形式确定类似环的子结构。如果这是真实的环结构，则磁盘外部的环位置和小尘埃与生长界的概念一致。这些结果表明，L1489 Protostellar磁盘可能是行星形成的开始。
For revealing the first step of the plant formation, it is important to understand how and when dust grains become larger in a disk around a protostar. To investigate the grain growth, we analyze dust continuum emission toward a disk around the Class I protostar, L1489 IRS at 0.9 and 1.3 mm wavelengths obtained by the Atacama Large Millimeter/submillimeter Array. The dust continuum emission extends to a disk radius ($r$) of $r\sim300$ au, and the spectral index ($α$) is derived to be $α\sim3.6$ at a radius of $r\sim100-300$ au, as similar to the interstellar dust. Therefore, the grain growth does not occur significantly in the outer disk ($r\sim100-300$ au). Furthermore, we tentatively identify a ring-like substructure at $r\sim90$ au even though the spatial resolution and sensitivity are not enough to determine this structure. If this is the real ring structure, the ring position and small dust in the disk outer part are consistent with the idea of the growth front. These results suggest that the L1489 protostellar disk may be the beginning of the planet formation.
