论文标题
jovian cybranetary磁盘的光蒸发I.解释Callisto的轨道和缺乏外部常规卫星
Photoevaporation of the Jovian circumplanetary disk I. Explaining the orbit of Callisto and the lack of outer regular satellites
论文作者
论文摘要
上下文：盖利亚卫星被认为是由木星周围的磁盘（CPD）形成的。当达到临界质量时，木星在太阳能全球磁盘（PPD）中打开了环形间隙，该磁盘可能已将CPD暴露于年轻的太阳或太阳系形成的恒星群集中的辐射。目的：我们研究了卫星形成过程中Jovian CPD暴露于该辐射场。在此上下文中研究了CPD的结果光蒸发，以限制Galilean卫星的可能形成场景，并解释Galilean系统的建筑特征。方法：我们构建了一个恒星出生群集的模型，以确定群内远程（FUV）辐射场。我们采用了通过流体动力模拟告知的分析环形间隙曲线，以研究Jovian间隙的一系列合理的几何形状。我们使用辐射热化学代码产品来评估Jovian间隙中的入射辐射场和嵌入式2D轴对称CPD的光蒸发。结果：我们得出了超过10 MYR的太阳能出生簇的时间依赖性内部FUV辐射场。我们发现簇内光蒸发会导致Jovian CPD的显着截断。我们确定可能CPD的稳态截断半径，发现外半径与积聚率$ \ dot {m}^{0.4} $成比例。对于CPD积聚率，$ \ dot m <10^{ - 12} m _ {\ odot} $ yr $^{ - 1} $，光蒸发截断解释了Callisto轨道外的其他卫星缺乏。对于质量$ m _ {\ rm cpd} <10^{ - 6.2 m _ {\ odot}} $的CPD，光蒸发可以在Callisto能够迁移到Laplace Resonance之前分散磁盘。这就解释了为什么卡利斯托是唯一排除在共鸣之外的唯一大型卫星。
Context: The Galilean satellites are thought to have formed from a circumplanetary disk (CPD) surrounding Jupiter. When it reached a critical mass, Jupiter opened an annular gap in the solar protoplanetary disk (PPD) that might have exposed the CPD to radiation from the young Sun or from the stellar cluster in which the Solar System formed. Aims: We investigate the radiation field to which the Jovian CPD was exposed during the process of satellite formation. The resulting photoevaporation of the CPD is studied in this context to constrain possible formation scenarios for the Galilean satellites and explain architectural features of the Galilean system. Methods: We constructed a model for the stellar birth cluster to determine the intracluster far-ultraviolet (FUV) radiation field. We employed analytical annular gap profiles informed by hydrodynamical simulations to investigate a range of plausible geometries for the Jovian gap. We used the radiation thermochemical code ProDiMo to evaluate the incident radiation field in the Jovian gap and the photoevaporation of an embedded 2D axisymmetric CPD. Results: We derive the time-dependent intracluster FUV radiation field for the solar birth cluster over 10 Myr. We find that intracluster photoevaporation can cause significant truncation of the Jovian CPD. We determine steady-state truncation radii for possible CPDs, finding that the outer radius is proportional to the accretion rate $\dot{M}^{0.4}$. For CPD accretion rates $\dot M < 10^{-12} M_{\odot}$ yr$^{-1}$, photoevaporative truncation explains the lack of additional satellites outside the orbit of Callisto. For CPDs of mass $M_{\rm CPD} < 10^{-6.2 M_{\odot}}$ , photoevaporation can disperse the disk before Callisto is able to migrate into the Laplace resonance. This explains why Callisto is the only massive satellite that is excluded from the resonance.
