论文标题
在HD 142527周围的原星盘中局部压降中尘埃捕获和反馈的运动学迹象
Kinematical signs of dust trapping and feedback in a local pressure bump in the protoplanetary disk around HD 142527 revealed with ALMA
论文作者
论文摘要
我们分析了六个波长在3至0.4 mm和13CO和C18O（1-0、2-1和3-2）线的六个波长中的档案数据，该线围绕HD 142527在HD 142527周围获得的档案数据（1-0、2-1和3-2）线。我们对在六个波长中获得的光谱分布进行了拟合，以估计灰尘表面密度和灰尘吸收系数β的光谱指数的分布。我们还通过拟合C18O光谱并通过将Keplerian磁盘模型拟合到C18O数据来测量磁盘旋转来估计气柱密度的分布。我们在HD 142527磁盘的西北部的灰尘环内外发现了超级和次杀伤力的旋转，暗示存在局部压力颠簸。与我们估计的灰尘和气体分布相比，压降的位置与该区域的尘埃密度高三倍，气体与灰尘质量比的三倍是磁盘中平均值的三倍，这表明压力凹凸处的灰尘诱捕。然而，我们派生的β分布与压降位置之间没有相关性。此外，我们发现灰尘环的宽度比压降的宽度相当或大，这可能表明灰尘反馈在压降中很明显。
We analyzed the archival data of the continuum emission at six wavelengths from 3 to 0.4 mm and 13CO and C18O (1-0, 2-1, and 3-2) lines in the protoplanetary disk around HD 142527 obtained with the Atacama Large Millimeter/submillimeter Array. We performed fitting to the spectral energy distributions obtained at the six wavelengths with the gray-body slab models to estimate the distributions of the dust surface density and spectral index of dust absorption coefficient beta. We also estimated the distribution of the gas column density by fitting the C18O spectra and measured the disk rotation by fitting the Keplerian disk models to the C18O data. We found super- and sub-Keplerian rotation inside and outside the dust ring in the northwest in the HD 142527 disk, suggestive of the presence of a local pressure bump. In comparison with our estimated dust and gas distributions, the location of the pressure bump is coincident with the region showing a three times higher dust density and a three times lower gas-to-dust mass ratio than the mean values in the disk, suggesting dust trapping in the pressure bump. Nevertheless, there is no correlation between our derived beta distribution and the location of the pressure bump. In addition, we found that the width of the dust ring is comparable or larger than the width of the pressure bump, which could suggest that dust feedback is significant in the pressure bump.
