Types of Outbursts From 67P/Churyumov-Gerasimenko, as Seen by Alice: Gas, Dust, Ice, and Hybrid - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Communication Dans Un Congrès Année : 2018

Types of Outbursts From 67P/Churyumov-Gerasimenko, as Seen by Alice: Gas, Dust, Ice, and Hybrid

Résumé

During ESA's Rosetta mission, the Alice far-ultraviolet spectrograph (700-2050Å) monitored gas and dust emissions from the comet 67P/Churyumov-Gerasimenko. Several large outbursts of gas and dust were observed. We classify these outbursts into four types: gas, dust, ice, and hybrid. During a gas outburst, the brightness of coma emission lines can increase by factors of a few on short time scales. In the case of dust outbursts, the brightness of sunlight reflected from dust can increase by almost two orders of magnitude on timescales of a few tens of minutes. Typically, the reflectance spectrum of dust is very similar to that of the pre-perihelion nucleus: dark and relatively featureless with a blue spectral slope. However, a subset of the sedust outbursts show a markedly different character, with dust that is bright-in some cases brighter than the sunlit nucleus itself- and displaying a strong absorption feature around 1700Å, characteristic of water ice. In such outbursts, the "dust" is likely to consist primarily of icy grains. There are also a class of hybrid outbursts that show enhancements of gas, dust, and/or water ice. We present examples of each of these types and discuss possible creation mechanisms.
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insu-04436372 , version 1 (03-02-2024)

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Andrew J. Steffl, Michael F. A'Hearn, Jean-Loup Bertaux, Lori Feaga, Paul Feldman, et al.. Types of Outbursts From 67P/Churyumov-Gerasimenko, as Seen by Alice: Gas, Dust, Ice, and Hybrid. American Astronomical Society, DPS meeting #50, Oct 2018, Knoxville, United States. pp.id.110.03. ⟨insu-04436372⟩
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