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| Titel |
Dust activities near the dawn terminator on 67P/Churyumov–Gerasimenko observed by Rosetta/OSIRIS |
| VerfasserIn |
Xian Shi, Xuanyu Hu, Holger Sierks, Ekkehard Kührt, Carsten Güttler, Jörg Knollenberg, Nilda Oklay |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250135074
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| Publikation (Nr.) |
 EGU/EGU2016-15876.pdf |
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| Zusammenfassung |
| High-resolution images obtained by the OSIRIS camera on board Rosetta spacecraft have revealed dust activities happening close to terminators on the nucleus of comet 67P/Churyumov-Gerasimenko. While activities observed beyond dusk terminator in the night side are considered being sustained by subsurface thermal lag [1], those observed by the dawn terminator might be connected to the sublimation of water ice accumulated on the surface through re-condensation process during night [2,3]. In this study we present pre-perihelion observations of dust emission observed shortly after local sunrise. We investigate the location of these activities as well as their relation with local topography. A generic thermal-physical model will be applied to examine the feasibility of re-condensed ice on the surface being the source of such activities.
[1] Shi, X., Hu, X., Sierks, H. et al., 2015, Sunset jets observed on comet 67P/Churyumov-Gerasimenko sustained by subsurface thermal lag, A&A, accepted.
[2] Prialnik, D., A’Hearn, M. F., & Meech, K. J., 2008, A mechanism for short-lived cometary outbursts at sunrise as observed by Deep Impact on 9P/Tempel 1, MNRAS, 388, L20.
[3] De Sanctis, M. C., Capaccioni, F., Ciarniello, M. et al., 2015, The diurnal cycle of water ice on comet 67P/Churyumov-Gerasimenko, Nature, 525, 500-503. |
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