论文标题
h $ _2 $ dust dust缺乏的原始磁盘的超紫色光子泵送的效果
The effect of ultra-violet photon pumping of H$_2$ in dust-deficient protoplanetary disks
论文作者
论文摘要
我们执行辐射流体动力学模拟，以研究光蒸发原球磁盘的结构和演变。从宿主恒星发出的紫外线和X射线辐射会加热磁盘表面，其中H $ _2 $泵送也有效地运行。我们运行一组模拟，以不同的灰尘晶粒量或防尘质量比，这决定了光电加热与h $ _2 $泵送之间的相对重要性。我们表明，如果灰尘与加气的质量比为$ \ MATHCAL {D} \ LEQ10^{ - 3} $，则H $ _2 $抽水和X射线加热对磁盘的质量降低会更大。 yr}^{ - 1} $。在这种缺陷的磁盘中，h $ _2 $泵送可增强内部磁盘区域的光蒸发，并塑造磁盘质量损失曲线。因此，我们认为后期磁盘的演变受超紫罗兰h $ _2 $泵送效果的影响。从我们的模拟中得出的质量损失率可用于长期磁盘演化的研究。
We perform radiation hydrodynamics simulations to study the structure and evolution of a photoevaporating protoplanetary disk. Ultraviolet and X-ray radiation from the host star heats the disk surface, where H$_2$ pumping also operates efficiently. We run a set of simulations with varying the amount of dust grains, or the dust-to-gas mass ratio, which determines the relative importance between photoelectric heating and H$_2$ pumping. We show that H$_2$ pumping and X-ray heating contribute stronger to the mass-loss of the disk if the dust-to-gas mass ratio is $\mathcal{D}\leq10^{-3}$.The disk mass loss rate decreases with a lower dust amount, but remains around $10^{-10-11} M_{\odot} {\rm yr}^{-1}$. In such dust-deficient disks, H$_2$ pumping enhances photoevaporation from the inner disk region and shapes the disk mass-loss profile. We thus argue that the late-stage disk evolution is affected by the ultra-violet H$_2$ pumping effect. The mass-loss rates derived from our simulations can be used in the study of long-term disk evolution.
