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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28002
Title: Long-term survival of surface water ice on comet 67P
Authors: Oklay, N.
Mottola, S.
Vincent, J. -B.
PAJOLA, MAURIZIO 
Fornasier, S.
Hviid, S. F.
Kappel, D.
Kührt, E.
Keller, H. U.
Barucci, M. A.
Feller, C.
Preusker, F.
Scholten, F.
Hall, I.
Sierks, H.
Barbieri, C.
Lamy, P. L.
Rodrigo, R.
Koschny, D.
Rickman, H.
A'Hearn, M. F.
Bertaux, J. -L.
Bertini, I.
Bodewits, D.
CREMONESE, Gabriele 
Da Deppo, V.
Davidsson, B. J. R.
Debei, S.
De Cecco, M.
Deller, J.
Deshapriya, J. D. P.
FULLE, Marco 
Gicquel, A.
Groussin, O.
Gutiérrez, P. J.
Güttler, C.
Hasselmann, P. H.
Hofmann, M.
Ip, W. -H.
Jorda, L.
Knollenberg, J.
Kovacs, G.
Kramm, J. -R.
Küppers, M.
Lara, L. M.
Lazzarin, M.
Lin, Z. -Y.
Moreno, J. J. Lopez
LUCCHETTI, ALICE 
Marzari, F.
Masoumzadeh, N.
Naletto, G.
Pommerol, A.
Shi, X.
Thomas, N.
Tubiana, C.
Issue Date: 2017
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 469
First Page: S582
Abstract: Numerous water-ice-rich deposits surviving more than several months on comet 67P/Churyumov-Gerasimenko were observed during the Rosetta mission. We announce the first-time detection of water-ice features surviving up to 2 yr since their first observation via OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) NAC (narrow angle camera). Their existence on the nucleus of comet 67P at the arrival of the Rosetta spacecraft suggests that they were exposed to the surface during the comet's previous orbit. We investigated the temporal variation of large water-ice patches to understand the long-term sustainability of water ice on cometary nuclei on time-scales of months and years. Large clusters are stable over typical periods of 0.5 yr and reduce their size significantly around the comet's perihelion passage, while small exposures disappear. We characterized the temporal variation of their multispectral signatures. In large clusters, dust jets were detected, whereas in large isolated ones no associated activity was detected. Our thermal analysis shows that the long-term sustainability of water-ice-rich features can be explained by the scarce energy input available at their locations over the first half year. However, the situation reverses for the period lasting several months around perihelion passage. Our two end-member mixing analysis estimates a pure water-ice equivalent thickness up to 15 cm within one isolated patch, and up to 2 m for the one still observable through the end of the mission. Our spectral modelling estimates up to 48 per cent water-ice content for one of the large isolated feature, and up to 25 per cent water ice on the large boulders located within clusters. <P />
URI: http://hdl.handle.net/20.500.12386/28002
URL: https://academic.oup.com/mnras/article/469/Suppl_2/S582/4111159
ISSN: 0035-8711
DOI: 10.1093/mnras/stx2298
Bibcode ADS: 2017MNRAS.469S.582O
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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