外照射原行星盘FUV的光化学动力学模型
Photochemical-dynamical models of externally FUV irradiated protoplanetary discs
摘要：
越来越多的理论和观测证据表明，原行星盘的演化可能会受到恒星形成环境中的远紫外线辐射的影响，导致即使在附近没有大质量恒星的情况下，盘外缘的物质也会大量剥离。在本文中，我们进行了第一次全辐射流体动力学模拟的流量从外边缘的原行星盘外部照射这样的中间强度FUV字段，包括直接建模的光子占主导地位的区域（PDR），这是需要准确计算的热性能。我们发现我们的模型与Facchini等人的半分析模型之间非常一致。（2016）对于流动本身的轮廓，以及质量损失率和“临界半径”的位置。这既验证了他们的结果（显着不同于以前的半解析估计）和我们的新的数值方法，后者现在可以应用于元素的问题，半解析方法是无法建模。我们还获得了流动的组成，但由于我们的模型的简单几何形状，我们只能暗示在这个阶段的外部照射光盘的未来观测的一些诊断。我们还讨论了这些模型作为未来光化学动力学代码的基准的潜力。
英文摘要：
There is growing theoretical and observational evidence that protoplanetary disc evolution may be significantly affected by the canonical levels of far ultraviolet (FUV) radiation found in a star forming environment, leading to substantial stripping of material from the disc outer edge even in the absence of nearby massive stars. In this paper we perform the first full radiation hydrodynamic simulations of the flow from the outer rim of protoplanetary discs externally irradiated by such intermediate strength FUV fields, including direct modelling of the photon dominated region (PDR) which is required to accurately compute the thermal properties. We find excellent agreement between our models and the semi-analytic models of Facchini et al. (2016) for the profile of the flow itself, as well as the mass loss rate and location of their "critical radius". This both validates their results (which differed significantly from prior semi-analytic estimates) and our new numerical method, the latter of which can now be applied to elements of the problem that the semi--analytic approaches are incapable of modelling. We also obtain the composition of the flow, but given the simple geometry of our models we can only hint at some diagnostics for future observations of externally irradiated discs at this stage. We also discuss the potential for these models as benchmarks for future photochemical-dynamical codes.
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