论文标题

锅,地图集和达芙妮的观赏赤道脊增积分

Accretion of Ornamental Equatorial Ridges on Pan, Atlas and Daphnis

论文作者

Quillen, Alice C., Zaidouni, Fatima, Nakajima, Miki, Wright, Esteban

论文摘要

我们探索了土星戒指上土星卫星锅,地图集和达芙妮的装饰脊的场景。当积聚材料的扭矩不超过土星的潮汐扭矩时,通常可以从环材中吸收复杂的脊,而这些扭矩通常会保持潮汐锁。这限制了赤道脊生长的最大积聚率和最小持续时间。我们探索从圆形轨道上,在圆形,倾斜或偏心轨道上的月球上探索从环材料中积聚的脊的经度分布。如果由于其形状的变化或磁盘边缘表面密度曲线的变化而使月亮在积聚过程中潮汐重新调查,则可以积聚倾斜的山脊,或者因为磁盘边缘的表面密度曲线允许在不同初始的半高轴轴上产生环形材料,以影响其赤道山脊上不同位置的月球。我们发现,从不对称差距中的积聚可能是Atlas赤道山脊上的抑郁症。如在PAN上所见,从类似于山丘偏心率的轨道偏心率的不对称间隙的积聚可能会允许多个裂片的积聚。两种可能连接的方案有望在观赏赤道山脊增长。月亮通过戒指迁移,缩小其间隙并促进积聚。月球的轨道偏心率可能会增加,因为与另一个月亮的轨道共振,将其推入间隙边缘并促进积聚。

We explore scenarios for the accretion of ornamental ridges on Saturn's moons Pan, Atlas, and Daphnis from material in Saturn's rings. Accretion of complex shaped ridges from ring material should be possible when the torque from accreted material does not exceed the tidal torque from Saturn that ordinarily maintains tidal lock. This gives a limit on the maximum accretion rate and the minimum duration for equatorial ridge growth. We explore the longitude distribution of ridges accreted from ring material, initially in circular orbits, onto a moon that is on a circular, inclined or eccentric orbit. Sloped and lobed ridges can be accreted if the moon tidally realigns during accretion due to its change in shape or because the disk edge surface density profile allows ring material originating at different initial semi-major axes to impact the moon at different locations on its equatorial ridge. We find that accretion from an asymmetric gap might account for a depression on Atlas's equatorial ridge. Accretion from an asymmetric gap at orbital eccentricity similar to the Hill eccentricity, might allow accretion of multiple lobes, as seen on Pan. Two possibly connected scenarios are promising for growth of ornamental equatorial ridges. The moon migrates through the ring, narrowing its gap and facilitating accretion. The moon's orbital eccentricity could increase due to orbital resonance with another moon, pushing it into its gap edges and facilitating accretion.

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