A survey of low-velocity collisional features in Saturn's F ring

A survey of low-velocity collisional features in Saturn's F ring
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土星 F 环低速碰撞特征的调查

DOI:
10.1016/j.icarus.2013.09.008
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发表时间:
2014
期刊:
影响因子:
3.2
通讯作者:
Attree N
Attree N
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Attree N

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Attree等人(2012)将卡西尼号图像中从土星F环发出的小型(0.50公里尺度)、不规则特征称为迷你喷流。对一个特殊的微型喷流进行了半个轨道周期的跟踪,揭示了其随时间的演变,并表明其起源是与当地一颗小卫星的碰撞。除了这些数据之外,我们还在这里对800多个F环小型喷气机的完整目录进行了更详细的分析,研究了它们的分布,形态和寿命,以便对潜在的小卫星种群进行限制。我们发现迷你喷气机随机位于环周围的经度,与月球普罗米修斯几乎没有相关性,并且在时间上随机分布,在卡西尼号的整个旅程中。它们倾向于聚集在一起,形成复杂的“多重”结构,并且具有典型的100年寿命。对某些特征的重复观测显示出重大的演变,包括产生新的微型喷流,这意味着同一物体的重复碰撞。这表明有一群半径为10.1公里的天体,它们具有一定的内部强度,轨道相对于F环的半长轴分布在±100公里以上,但大多数在20公里以内。这些天体很可能是在普罗米修斯的扰动下形成的,随后被分散到不同的轨道上。这加强了F环作为一个在碰撞,破坏和吸积之间具有复杂平衡的区域的想法。
Small (∼50 km scale), irregular features seen in Cassini images to be emanating from Saturn’s F ring have been termed mini-jets by Attree et al. (2012). One particular mini-jet was tracked over half an orbital period, revealing its evolution with time and suggesting a collision with a local moonlet as its origin. In addition to these data we present here a much more detailed analysis of the full catalogue of over 800 F ring mini-jets, examining their distribution, morphology and lifetimes in order to place constraints on the underlying moonlet population. We find mini-jets randomly located in longitude around the ring, with little correlation to the moon Prometheus, and randomly distributed in time, over the full Cassini tour to date. They have a tendency to cluster together, forming complicated ‘multiple’ structures, and have typical lifetimes of ∼1d. Repeated observations of some features show significant evolution, including the creation of new mini-jets, implying repeated collisions by the same object. This suggests a population of ≲1 km radius objects with some internal strength and orbits spread over ±100 km in semi-major axis relative to the F ring but with the majority within 20 km. These objects likely formed in the ring under, and were subsequently scattered onto differing orbits by, the perturbing action of Prometheus. This reinforces the idea of the F ring as a region with a complex balance between collisions, disruption and accretion.
DOI: 10.1017/cbo9780511983665.009
发表时间: 1990
期刊: Bioinformatics
影响因子: 5.8
作者:
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土星 F 环周围的带电粒子耗尽 - 小卫星带的证据?
DOI: 10.1016/0019-1035(88)90043-7
发表时间: 1988
期刊: Icarus
影响因子: 3.2
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通讯作者: J. Burns
DOI: 10.1016/j.icarus.2012.02.020
发表时间: 2012-05-01
期刊: ICARUS
影响因子: 3.2
作者:
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DOI: 10.1126/science.1119387
发表时间: 2005-11-25
期刊: SCIENCE
影响因子: 56.9
作者:
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通讯作者: Baillie, K
DOI: 10.1088/2041-8205/755/2/l27
发表时间: 2012
期刊: The Astrophysical Journal
影响因子: --
作者:
Attree N
通讯作者: Attree N