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    Detection of exposed H2O ice on the nucleus of comet 67P/Churyumov-Gerasimenko

    Barucci, M.A. and Filacchione, G. and Fornasier, S. and Raponi, A. and Deshapriya, J.D.P. and Tosi, F. and Feller, C. and Ciarniello, M. and Sierks, H. and Capaccioni, F. and Pommerol, A. and Massironi, M. and Oklay, N. and Merlin, F. and Vincent, J.-B. and Fulchignoni, M. and Guilbert-Lepoutre, A. and Perna, D. and Capria, M.T. and Hasselmann, P.H. and Rousseau, B. and Barbieri, C. and Bockelée-Morvan, D. and Lamy, P.L. and De Sanctis, C. and Rodrigo, R. and Erard, S. and Koschny, D. and Leyrat, C. and Rickman, H. and Drossart, P. and Keller, H.U. and A’Hearn, M.F. and Arnold, G. and Bertaux, J.-L. and Bertini, I. and Cerroni, P. and Cremonese, G. and Da Deppo, V. and Davidsson, B.J.R. and El-Maarry, Mohamed Ramy and Fonti, S. and Fulle, M. and Groussin, O. and Güttler, C. and Hviid, S.F. and Ip, W. and Jorda, L. and Kappel, D. and Knollenberg, J. and Kramm, J.-R. and Kührt, E. and Küppers, M. and Lara, L. and Lazzarin, M. and Lopez Moreno, J.J. and Mancarella, F. and Marzari, F. and Mottola, S. and Naletto, G. and Pajola, M. and Palomba, E. and Quirico, E. and Schmitt, B. and Thomas, N. and Tubiana, C. (2016) Detection of exposed H2O ice on the nucleus of comet 67P/Churyumov-Gerasimenko. Astronomy & Astrophysics 595 , A102. ISSN 0004-6361.

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    Abstract

    Context. Since the orbital insertion of the Rosetta spacecraft, comet 67P/Churyumov-Gerasimenko (67P) has been mapped by OSIRIS camera and VIRTIS spectro-imager, producing a huge quantity of images and spectra of the comet’s nucleus. Aims. The aim of this work is to search for the presence of H2O on the nucleus which, in general, appears very dark and rich in dehydrated organic material. After selecting images of the bright spots which could be good candidates to search for H2O ice, taken at high resolution by OSIRIS, we check for spectral cubes of the selected coordinates to identify these spots observed by VIRTIS. Methods. The selected OSIRIS images were processed with the OSIRIS standard pipeline and corrected for the illumination conditions for each pixel using the Lommel-Seeliger disk law. The spots with higher I/F were selected and then analysed spectrophotometrically and compared with the surrounding area. We selected 13 spots as good targets to be analysed by VIRTIS to search for the 2 μm absorption band of water ice in the VIRTIS spectral cubes. Results. Out of the 13 selected bright spots, eight of them present positive H2O ice detection on the VIRTIS data. A spectral analysis was performed and the approximate temperature of each spot was computed. The H2O ice content was confirmed by modeling the spectra with mixing (areal and intimate) of H2O ice and dark terrain, using Hapke’s radiative transfer modeling. We also present a detailed analysis of the detected spots.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): comets: individual: 67P/Churyumov-Gerasimenko / techniques: imaging spectroscopy / techniques: photometric / techniques: image processing / methods: data analysis
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Depositing User: Administrator
    Date Deposited: 26 Oct 2018 11:39
    Last Modified: 26 Oct 2018 11:39
    URI: http://eprints.bbk.ac.uk/id/eprint/24834

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