论文标题
L1551区域的原始二进制系统的环形磁盘
Circumbinary Disks of the Protostellar Binary Systems in the L1551 Region
论文作者
论文摘要
我们报告了ALMA循环4二进制Protostellar系统L1551 IRS 5在0.9毫米连续发射，C18O（J = 3-2），OCS（J = 28-27）和其他四个频段7线中。在0.9毫米排放中的分辨率〜0.07“（= 10 au）的分辨率下，与二进制质量静态相关的两个偶然磁盘（CSD）与圆盘（CBD）分开。CBD分离为两个螺旋臂，将其分为两个螺旋臂，一个螺旋臂，一个与北部的Binary 7相比，与CSD相比，与CSD相比。 NE，L1551 IRS 5中的CBD更紧凑（r〜150 au），在L1551 NE中发现的螺旋的M = 1模式在L1551 IRS 5中不太明显。此外，尘埃和分子线的亮度和分子线的亮度分别是CSDS和CBD的> 260 K和CBD> 260 kk and> 260 kh> 260 kh> 260 irs ex> 100 irs in l1 irs in。 L1551 NE。 CSD旋转，L1551 IRS 5中较高的温度可能反映出推断的FU-ORI事件。
We report ALMA Cycle 4 observations of the Class I binary protostellar system L1551 IRS 5 in the 0.9-mm continuum emission, C18O (J=3-2), OCS (J=28-27), and four other Band 7 lines. At ~0.07" (= 10 au) resolution in the 0.9 mm emission, two circumstellar disks (CSDs) associated with the binary protostars are separated from the circumbinary disk (CBD). The CBD is resolved into two spiral arms, one connecting to the CSD around the northern binary source, Source N, and the other to Source S. As compared to the CBD in the neighboring protobinary system L1551 NE, the CBD in L1551 IRS 5 is more compact (r ~150 au) and the m=1 mode of the spirals found in L1551 NE is less obvious in L1551 IRS 5. Furthermore, the dust and molecular-line brightness temperatures of CSDs and CBD reach >260 K and >100 K, respectively, in L1551 IRS 5, much hotter than those in L1551 NE. The gas motions in the spiral arms are characterized by rotation and expansion. Furthermore, the transitions from the CBD to the CSD rotations at around the L2 and L3 Lagrangian points and gas motions around the L1 point are identified. Our numerical simulations reproduce the observed two spiral arms and expanding gas motion as a result of gravitational torques from the binary, transitions from the CBD to the CSD rotations, and the gas motion around the L1 point. The higher temperature in L1551 IRS 5 likely reflects the inferred FU-Ori event.
