An exploration of Pluto's environment through stellar occultations

An exploration of Pluto's environment through stellar occultations
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通过恒星掩星探索冥王星的环境

DOI:
10.1051/0004-6361/201321836
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发表时间:
2014
影响因子:
6.5
通讯作者:
Boissel Y
Boissel Y
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Boissel Y

文献摘要

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冥王星有五颗已知的卫星,直径从1200公里到40公里不等,这可能是碰撞的结果。较小的物体可能存在,并可能保持纤细的环,因此代表在新视野号飞越2015年7月的危险。AimsThe目标是提供一个上限的数量看不见的小天体和/或等效宽度的推定冥王星ringsMethodsWe使用冥王星恒星appulse在2006年4月10日,和恒星掩星的矮行星在2007年6月14日,结果我们最好的数据集的地方3σ上限为0.3公里的半径孤立的小卫星,我们可以检测到。在没有检测的情况下,我们得出的上限为15 000的距离小于70 000公里,从冥王星的系统重心这样的机构的数量。我们将3σ的上限设为30−100 m,代表在13000 ~ 70000 km的质心距离范围内环物质的等效宽度。这一限制仅适用于窄环,即宽度小于约10公里。
ContextPluto has five known satellites with diameters ranging from ~1200 km down to ~40 km, a possible outcome of a collisional origin. Smaller objects probably exist and may maintain tenuous rings, thus representing hazards during the New Horizons flyby of July 2015.AimsThe goal is to provide an upper limit for the numbers of unseen small bodies and/or equivalent widths of putative Pluto rings.MethodsWe use a Pluto stellar appulse on April 10, 2006, and a stellar occultation by the dwarf planet on June 14, 2007, to scan Pluto’s surroundings.ResultsOur best data set places a 3σupper limit of 0.3 km for the radius of isolated moonlets that we can detect. In the absence of detection, we derive an upper limit of 15 000 for the number of such bodies at distances smaller than ~70 000 km from Pluto’s system barycenter. We place a 3σupper limit of typically 30−100 m for the equivalent width of ring material at barycentric distances ranging from 13 000 to 70 000 km. This limit applies for narrow rings only, i.e. less than about 10 km in width.