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Detection of exposed H2O ice on the nucleus of comet 67P/Churyumov-Gerasimenko as observed by Rosetta OSIRIS and VIRTIS instruments

M. Antonella Barucci 1 G. Filacchione 2 Sonia Fornasier 1 A. Raponi 2 J. D.P. Deshapriya 1 F. Tosi 2 C. Feller 1 M. Ciarniello 2 Holger Sierks 3 F. Capaccioni 2 A. Pommerol 4 Matteo Massironi 5 Nilda Oklay 3 F. Merlin 1 Jean-Baptiste Vincent 3 M. Fulchignoni 1 A. Guilbert-Lepoutre 6 D. Perna 1 M.T. Capria 2 P. H. Hasselmann 1 B. Rousseau 1 Cesare Barbieri 7 D. Bockelée-Morvan 1 Philippe L. Lamy 8 C. de Sanctis 2 Rafael Rodrigo 9 S. Erard 2 Detlef Koschny 10 C. Leyrat 1 H. Rickman 11, 12 P. Drossart 1 Horst U. Keller 13 Michael F. A'Hearn 14 G. Arnold 15 Jean-Loup Bertaux 16 Ivano Bertini 17 P. Cerroni 2 Gabriele Cremonese 17 Vania da Deppo 18 Björn J. R. Davidsson 19 Mohamed R. El-Maarry 4 S. Fonti 20 M. Fulle 21 O. Groussin 8 C. Güttler 3 S. F. Hviid 15 W. Ip 22 L. Jorda 8 D. Kappel 15 J. Knollenberg 15 J.-R. Kramm 3 Ekkehard Kührt 15 M. Küppers 23 L. Lara 24 Monica Lazzarin 17 J. J. Lopez Moreno 24 F. Mancarella 20 F. Marzari 7 S. Mottola 15 Giampiero Naletto 18 Maurizio Pajola 25 E. Palomba 2 E. Quirico 26 B. Schmitt 26 Nicholas Thomas 4 Cécilia Tubiana 3 
Abstract : Since the orbital insertion of the Rosetta spacecraft, comet 67P/Churyumov-Gerasimenko (67P/C-G) has been mapped by OSIRIS camera and VIRTIS spectro-imager, producing a huge quantity of images and spectra of the comet’s nucleus. 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 condi- tions for each pixel using the Lommel-Seeliger disk law. The spots with higher I/F were selected and then analysed spectrophotomet- rically 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.
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M. Antonella Barucci, G. Filacchione, Sonia Fornasier, A. Raponi, J. D.P. Deshapriya, et al.. Detection of exposed H2O ice on the nucleus of comet 67P/Churyumov-Gerasimenko as observed by Rosetta OSIRIS and VIRTIS instruments. Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 595, A102 (13 p.). ⟨10.1051/0004-6361/201628764⟩. ⟨insu-01371174⟩



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