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 Björn J. R. Davidsson 18 Mohamed R. El-Maarry 4 S. Fonti 19 M. Fulle 20 O. Groussin 8 C. Güttler 3 S. F. Hviid 21 W. Ip 22 L. Jorda 8 D. Kappel 21 J. Knollenberg 21 J.-R. Kramm 3 E. Kührt 21 M. Küppers 23 L. Lara 24 Monica Lazzarin 17 J. J. Lopez Moreno 24 F. Mancarella 19 F. Marzari 7 S. Mottola 21 Giampiero Naletto Maurizio Pajola 25 E. Palomba 2 E. Quirico 26 B. Schmitt 26 Nicholas Thomas 4 Cécilia Tubiana 3
1 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
2 IAPS - Istituto di Astrofisica e Planetologia Spaziali
3 MPS - Max-Planck-Institut für Sonnensystemforschung
4 Physikalisches Institut [Bern]
5 Dipartimento di Geoscienze [Padova]
6 UTINAM - Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules
7 Dipartimento di Fisica e Astronomia "Galileo Galilei"
8 LAM - Laboratoire d'Astrophysique de Marseille
9 ISSI - International Space Science Institute
10 ESTEC - European Space Research and Technology Centre
11 SRC - Space Research Centre [Warsaw]
12 Department of Physics and Astronomy [Uppsala]
13 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
14 Department of Astronomy [College Park]
15 DLR Institute of Planetary Research
16 IMPEC - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
17 OAPD - INAF - Osservatorio Astronomico di Padova
18 JPL - Jet Propulsion Laboratory
19 Department of Physics [Lecce]
20 OAT - INAF - Osservatorio Astronomico di Trieste
21 DLR Institut für Planetenforschung
22 Institute of Space Sciences [NCU]
23 Operations Department (ESAC)
24 IAA - Instituto de Astrofísica de Andalucía
25 ARC - NASA Ames Research Center
26 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
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.
Keywords : Photometry Comets 67P/Churyumov-Gerasimenko Data analysis Spectroscopy
Type de document :
Article dans une revue
Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 595, A102 (13 p.). <10.1051/0004-6361/201628764>
Liste complète des métadonnées
https://hal-insu.archives-ouvertes.fr/insu-01371174
Contributeur : Catherine Cardon <>
Soumis le : samedi 24 septembre 2016 - 14:53:59
Dernière modification le : jeudi 20 juillet 2017 - 09:30:36

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INSU | UNIV-FCOMTE | OSUG | LESIA | OBSPM | UPMC | OSU-INSTITUT-PYTHEAS | UVSQ | LAM | IPAG | LATMOS | UNIV-AMU | UGA | PSL | USPC | UNIV-PARIS-SACLAY | UNIV-PARIS13

Citation

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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