论文标题
用ALMA测量狼疮中的原星盘的尘埃质量：证据表明磁盘可以在3 mm处光亮厚
Measuring the Dust Masses of Protoplanetary Disks in Lupus with ALMA: Evidence that Disks can be Optically Thick at 3 mm
论文作者
论文摘要
准确的磁盘质量测量对于约束磁盘的演变和行星形成的时间尺度是必要的，但是这种测量很难进行，并且非常依赖于假设。在这里，我们看一下磁盘在无线电波长方面光学上很薄，并且该假设对磁盘尘埃质量的测量的影响。我们对位于Young（〜1-3 Myr旧）狼疮区域的41个原球盘的光谱能量分布（SED）进行建模，包括0.89 mm，1.33 mm和3 mm的通量密度。我们测量的磁盘灰尘块是在（亚）毫米中光学薄发射的假设下使用常用的磁盘灰尘质量方程时高约1.5-6倍。这种差异的原因是，大多数磁盘在毫米波长（甚至最高3毫米）上是光学厚度厚的，这表明需要在较长波长处进行观察以追踪磁盘的完全光学薄的发射。
Accurate disk mass measurements are necessary to constrain disk evolution and the timescale of planet formation, but such measurements are difficult to make and are very dependent on assumptions. Here we look at the assumption that the disk is optically thin at radio wavelengths and the effect of this assumption on measurements of disk dust mass. We model the optical to radio spectral energy distributions (SEDs) of 41 protoplanetary disks located in the young (~1-3 Myr old) Lupus star-forming region, including 0.89 mm, 1.33 mm, and 3 mm flux densities when available. We measure disk dust masses that are ~1.5-6 times higher than when using the commonly adopted disk dust mass equation under the assumption of optically thin emission in the (sub-)millimeter. The cause of this discrepancy is that most disks are optically thick at millimeter wavelengths, even up to 3 mm, demonstrating that observations at longer wavelengths are needed to trace the fully optically thin emission of disks.
