An exploration of Pluto's environment through stellar occultations
An exploration of Pluto's environment through stellar occultations
复制标题
通过恒星掩星探索冥王星的环境
DOI:
10.1051/0004-6361/201321836
复制
发表时间:
2014
影响因子:
6.5
通讯作者:
Boissel Y
中科院分区:
文献类型:
--
作者:
Boissel Y
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.