论文标题
用ALMA测量行星形成磁盘中的湍流运动：DM TAU周围的检测以及MWC 480和V4046 SGR周围的非检测
Measuring turbulent motion in planet-forming disks with ALMA: A detection around DM Tau and non-detections around MWC 480 and V4046 Sgr
论文作者
论文摘要
在许多行星形成模型中，湍流是至关重要的因素，但仅在少数行星形成磁盘中直接受到限制。在HD 163296和TW HYA圆盘中的湍流上的上限上，我们向Alma Co j = 2-1行观察以$ \ sim0.3“ $ \ sim0.3” $（20-50 au）分辨率和80 ms $^{ - 1} $频道在DM Tau，MWC 480和V480和V4046 Sgr的模型中的磁盘间隔DM TAU周围的非热气运动在0.25 c $ _s $和0.33 C $ _s $之间，其范围由系统效应主导，这使得我们使用相同的非湍流直接测量的唯一可直接测量的系统。 （$ <$ <$ 0.12 c $ _s $）。
Turbulence is a crucial factor in many models of planet formation, but it has only been directly constrained among a small number of planet forming disks. Building on the upper limits on turbulence placed in disks around HD 163296 and TW Hya, we present ALMA CO J=2-1 line observations at $\sim0.3"$ (20-50 au) resolution and 80 ms$^{-1}$ channel spacing of the disks around DM Tau, MWC 480, and V4046 Sgr. Using parametric models of disk structure, we robustly detect non-thermal gas motions around DM Tau of between 0.25 c$_s$ and 0.33 c$_s$, with the range dominated by systematic effects, making this one of the only systems with directly measured non-zero turbulence. Using the same methodology, we place stringent upper limits on the non-thermal gas motion around MWC 480 ($<$0.08c$_s$) and V4046 Sgr ($<$0.12 c$_s$). The preponderance of upper limits in this small sample, and the modest turbulence levels consistent with dust studies, suggest that weak turbulence ($α\lesssim10^{-3}$) may be a common, albeit not universal, feature of planet-forming disks. We explore the particular physical conditions around DM Tau that could lead this system to be more turbulent than the others.
