exoALMA XIX: 验证DM Tau原行星盘中非热线展宽
exoALMA XIX: Confirmation of Non-thermal Line Broadening in the DM Tau Protoplanetary Disk
AI总结：
该研究通过高分辨率分子线观测验证了DM Tau原行星盘中非热线展宽的存在，揭示了盘结构与非热运动的关系，并展示了该方法在其他盘研究中的应用潜力。
摘要：
湍流预计会运输角动量并驱动物质吸积在原行星盘中。通过分子线展宽直接测量盘中湍流运动的一种方法是通过分子线展宽。DM Tau是少数几个声称检测到非热线展宽的盘之一，其非热线展宽为0.25cs-0.33cs，其中cs是声速。利用在贝叶斯推理框架中评估超过五百万个盘模型的辐射转移代码mcfost，我们拟合了来自exoALMA大型计划的DM Tau的高分辨率（0.15
英文摘要：
Turbulence is expected to transport angular momentum and drive mass accretion in protoplanetary disks. One way to directly measure turbulent motion in disks is through molecular line broadening. DM Tau is one of only a few disks with claimed detection of nonthermal line broadening of 0.25cs-0.33cs, where cs is the sound speed. Using the radiative transfer code mcfost within a Bayesian inference framework that evaluates over five million disk models to efficiently sample the parameter space, we fit high-resolution (0.15", 28 m s-1) 12CO J = 3-2 observations of DM Tau from the exoALMA Large Program. This approach enables us to simultaneously constrain the disk structure and kinematics, revealing a significant nonthermal contribution to the line width of ~0.4cs, inconsistent with purely thermal motions. Using the CO-based disk structure as a starting point, we reproduce the CS J = 7-6 emission well, demonstrating that the CS (which is more sensitive to nonthermal motions than CO) agrees with the turbulence inferred from the CO fit. Establishing a well-constrained background disk model further allows us to identify residual structures in the moment maps that deviate from the expected emission, revealing localized perturbations that may trace forming planets. This framework provides a powerful general approach for extracting disk structure and nonthermal broadening directly from molecular line data and can be applied to other disks with high-quality observations.
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