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Variations in the amount of water ice on Ceres' surface suggest a seasonal water cycle

Journal
Date Issued
2018
Author(s)
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AMMANNITO, ELEONORA
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Combe, Jean-Philippe
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Giardino, Marco
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Joy, Steven P.
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Polanskey, Carol A.
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Rayman, Marc D.
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Raymond, Carol A.
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Russell, Christopher T.
DOI
Abstract
The dwarf planet Ceres is known to host a considerable amount of water in its interior, and areas of water ice were detected by the Dawn spacecraft on its surface. Moreover, sporadic water and hydroxyl emissions have been observed from space telescopes. We report the detection of water ice in a mid-latitude crater and its unexpected variation with time. The Dawn spectrometer data show a change of water ice signatures over a period of 6 months, which is well modeled as ~2-km2 increase of water ice. The observed increase, coupled with Ceres' orbital parameters, points to an ongoing process that seems correlated with solar flux. The reported variation on Ceres' surface indicates that this body is chemically and physically active at the present time.
Volume
4
Issue
3
Start page
eaao3757
Uri
Url
Issn Identifier
2375-2548
Ads BibCode
2018SciA....4.3757R
Rights
open.access
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