由外部远紫外辐射驱动的具有光蒸发风的环双星原行星盘的演化
Evolution of circumbinary protoplanetary disks with photoevaporative winds driven by External Far Ultraviolet Radiation
摘要：
原行星盘（PPD）的寿命被认为是严重限制的材料消耗机制，包括光蒸发风由于主星辐射或外部辐射源。以往的研究大多集中在探索风在单星暴露的PPD中的作用，然而，探索由主星辐射和外部辐射源驱动的光蒸发风的环双星盘的演化值得进一步研究。在本研究中，我们探讨了外围远紫外辐射场诱导的光蒸发风对环双星PPD演化的影响。我们发现，这种质量损失过程可以显着约束的circumbinary PPD的属性，包括它的寿命，质量和半径。例如，发现环双星PPD的寿命比类似的环星盘长约2倍，这种增强强烈依赖于粘度参数。但我们的模型表明，粘度依赖的磁盘寿命在circumbinary的情况下是更明显的拱星的情况下相比。我们还表明，分散的circumbinary PPD发生在一个较长的时间，磁盘温度分布变得陡峭。我们的研究结果还意味着，在一个光蒸发的circumbinary PPD的死区延伸到一个更大的径向范围相比，拱星盘对应。我们还表明，我们的计算是在协议与观察到的circumbinary PPD的轨道等质量的二进制文件。
英文摘要：
Lifetimes of protoplanetary disks (PPDs) are believed to be severely constrained by material depleting mechanisms, including photoevaporative winds due to the host star radiation or external radiation sources. Most previous studies focused on exploring the role of the winds in the exposed PPDs with a single star; however, exploring the evolution of the circumbinary disks with the photoevaporative winds driven by the host star radiation and external radiation sources deserves further investigation. In this study, we investigate the evolution of the circumbinary PPDs with the photoevaporative winds induced by external far ultraviolet (FUV) radiation field. We show that this mass-loss process can significantly constrain properties of a circumbinary PPD, including its lifetime, mass and radius. The lifetime of a circumbinary PPD, for instance, is found by a factor of about two longer than a similar circumstellar disk and this enhancement strongly depends on the viscosity parameter. But our model shows that viscosity dependence of the disk lifetime in the circumbinary case is more pronounced compared to the circumstellar case. We also show that dispersal of a circumbinary PPD occurs over a longer time as the disk temperature distribution becomes steeper. Our results also imply that dead zone in a photoevaporative circumbinary PPD extends over a larger radial range in comparison to a circumstellar disk counterpart. We also show that our calculations are in agreement with the observed circumbinary PPDs orbiting equal-mass binaries.
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