Constraining Time Variations in Enceladus’s Water-vapor Plume with Near-infrared Spectra from Cassini’s Visual and Infrared Mapping Spectrometer

IF 3.8 Q2 ASTRONOMY & ASTROPHYSICS The Planetary Science Journal Pub Date : 2024-06-16 DOI:10.3847/psj/ad4c69
K. E. Denny, M. M. Hedman, D. Bockelée-Morvan, G. Filacchione and F. Capaccioni
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Abstract

Water vapor produces a series of diagnostic emission lines in the near-infrared between 2.60 and 2.75 μm. The Visual and Infrared Mapping Spectrometer (VIMS) on board the Cassini spacecraft detected this emission signal from Enceladus’s plume, and so VIMS observations provide information about the variability of the plume’s water-vapor content. Using a data set of 249 spectral cubes with relatively high signal-to-noise ratios, we confirmed the strength of this water-vapor emission feature corresponds to a line-of-sight column density of order 1020 molecules m−2, which is consistent with previous measurements from Cassini’s Ultraviolet Imaging Spectrograph. Comparing observations made at different times indicates that the water-vapor flux is unlikely to vary systematically with Enceladus’s orbital phase, unlike the particle flux, which does vary with orbital phase. However, variations in the column density on longer and shorter timescales cannot be ruled out and merit further investigation.
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利用卡西尼号可见光和红外绘图分光计的近红外光谱确定土卫二水汽羽流的时间变化
水蒸气在 2.60 和 2.75 μm 之间的近红外波段产生一系列诊断发射线。卡西尼号飞船上的可见光和红外绘图分光仪(VIMS)探测到了来自恩克拉多斯羽流的这一发射信号,因此可见光和红外绘图分光仪的观测提供了有关羽流水蒸气含量变化的信息。我们利用信噪比相对较高的 249 个光谱立方体数据集,确认了这一水蒸气发射特征的强度与 1020 分子 m-2 量级的视线柱密度相对应,这与卡西尼号紫外线成像分光仪之前的测量结果一致。比较不同时间的观测结果表明,水蒸气通量不太可能随着恩克拉多斯轨道相位的变化而系统地变化,这与粒子通量不同,后者确实会随着轨道相位的变化而变化。不过,不能排除水柱密度在较长和较短时间尺度上的变化,这值得进一步研究。
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来源期刊
The Planetary Science Journal
The Planetary Science Journal Earth and Planetary Sciences-Geophysics
CiteScore
5.20
自引率
0.00%
发文量
249
审稿时长
15 weeks
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