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Catalogue POP – Notice individuelle de publication

Oklay Nilda, Mottola Stefano, Vincent Jean-Baptiste, Pajola Maurizio, Fornasier Sonia, Hviid Stubbe F., Kappel David, Kührt Ekkehard, Keller Horst Uwe, Barucci Maria Antonella, Feller Clément, Preusker Frank, Scholten Frank, Hall I., Sierks Holger, Barbieri Cesare, Lamy Philippe, Rodrigo Rafael, Koschny Detlef, Rickman Hans, A'Hearn M. F., Bertaux Jean-Loup, Bertini Ivano, Bodewits Dennis, Cremonese Gabriele, Da Deppo Vania, Davidsson Björn, Debei Stefano, De Cecco M., Deller Jakob, Deshapriya J. D. P., Fulle Marco, Gicquel Adeline, Groussin Olivier, Gutierrez Pedro J., Güttler Carsten, Hasselmann Pedro Henrique, Hofmann M., Ip W., Jorda Laurent, Knollenberg Jörg, Kovacs Gabor, Kramm Rainer, Küppers Michael, Lara Luisa M., Lazzarin Monica, Lin Zhong-Yi, Moreno J. J. Lopez, Lucchetti Alice, Marzari Francesco, Masoumzadeh N., Naletto Giampiero, Pommerol Antoine, Shi X., Thomas Nicholas, Tubiana Cecilia

Long-term survival of surface water ice on comet 67P

Monthly notices of the Royal Astronomical Society, 2017, vol. 469, pp. S582-S597

Référence DOI : 10.1093/mnras/stx2298
Référence ADS : 2017MNRAS.469S.582O

Résumé :

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.

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