论文标题
彼得·潘光盘：查找梦幻岛的参数
Peter Pan Discs: finding Neverland's parameters
论文作者
论文摘要
彼得潘盘是最近发现的一类长寿命圆盘周围的圆盘，其生存的数量级比典型盘长。在本文中，我们使用圆盘进化模型来确定初始条件和彼得潘盘的分散过程之间的所需平衡。我们发现我们需要低运输（$α\ sim10^{ - 4} $），极低的外部光蒸发（$ \ leq10^{ - 9} {\ rm m _ {\ odot}/yr} $），相对较高的圆盘质量（$> 0.25m _**$）与disces disces confers and Ages and Occretion confinenty consection and codion discess and codion corpers。较高的运输（$α= 10^{ - 3} $）导致圆盘寿命太短甚至更低的传输（$α= 10^{ - 5} $）会导致比观察到的物质小的积聚率。所需的外部光蒸发率是如此之低，以至于原始的彼得锅盘将在低质量恒星形成区域或深层嵌入的稀有环境中形成，因此从未暴露于更高量的紫外线辐射。鉴于这种外部光蒸发场景很少见，因此所需的圆盘参数和积聚特性可能反映出低质量恒星周围圆盘的初始条件和增生速率。
Peter Pan discs are a recently discovered class of long-lived discs around low-mass stars that survive for an order of magnitude longer than typical discs. In this paper we use disc evolutionary models to determine the required balance between initial conditions and the magnitude of dispersal processes for Peter Pan discs to be primordial. We find that we require low transport ($α\sim10^{-4}$), extremely low external photoevaporation ($\leq10^{-9}{\rm M_{\odot}/yr}$), and relatively high disc masses ($>0.25M_*$) to produce discs with ages and accretion rates consistent with Peter Pan discs. Higher transport ($α= 10^{-3}$) results in disc lifetimes that are too short and even lower transport ($α= 10^{-5}$) leads to accretion rates smaller than those observed. The required external photoevaporation rates are so low that primordial Peter Pan discs will have formed in rare environments on the periphery of low-mass star-forming regions, or deeply embedded, and as such have never subsequently been exposed to higher amounts of UV radiation. Given that such an external photoevaporation scenario is rare, the required disc parameters and accretion properties may reflect the initial conditions and accretion rates of a much larger fraction of the discs around low-mass stars.
