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http://hdl.handle.net/20.500.12386/24720
Titolo: | Detection of exposed H2O ice on the nucleus of comet 67P/Churyumov-Gerasimenko. as observed by Rosetta OSIRIS and VIRTIS instruments | Autori: | Barucci, M. A. FILACCHIONE, GIANRICO Fornasier, S. RAPONI, Andrea Deshapriya, J. D. P. TOSI, Federico Feller, C. CIARNIELLO, Mauro Sierks, H. CAPACCIONI, FABRIZIO Pommerol, A. Massironi, M. Oklay, N. Merlin, F. Vincent, J. -B. Fulchignoni, M. Guilbert-Lepoutre, A. Perna, D. Capria, M. T. Hasselmann, P. H. ROUSSEAU, BATISTE PAUL RAYMOND Barbieri, C. Bockelée-Morvan, D. Lamy, P. L. DE SANCTIS, MARIA CRISTINA Rodrigo, R. Erard, S. Koschny, D. Leyrat, C. Rickman, H. Drossart, P. Keller, H. U. A'Hearn, M. F. Arnold, G. Bertaux, J. -L. Bertini, I. Cerroni, P. CREMONESE, Gabriele Da Deppo, V. Davidsson, B. J. R. El-Maarry, M. R. Fonti, S. FULLE, Marco Groussin, O. Güttler, C. Hviid, S. F. Ip, W. Jorda, L. Kappel, D. Knollenberg, J. Kramm, J. -R. Kührt, E. Küppers, M. Lara, L. Lazzarin, M. Lopez Moreno, J. J. Mancarella, F. Marzari, F. Mottola, S. Naletto, G. PAJOLA, MAURIZIO PALOMBA, Ernesto Quirico, E. Schmitt, B. Thomas, N. Tubiana, C. |
Data pubblicazione: | 2016 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 595 | Da pagina:: | A102 | 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 H<SUB>2</SUB>O 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 H<SUB>2</SUB>O 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 H<SUB>2</SUB>O ice detection on the VIRTIS data. A spectral analysis was performed and the approximate temperature of each spot was computed. The H<SUB>2</SUB>O ice content was confirmed by modeling the spectra with mixing (areal and intimate) of H<SUB>2</SUB>O ice and dark terrain, using Hapke's radiative transfer modeling. We also present a detailed analysis of the detected spots. | URI: | http://hdl.handle.net/20.500.12386/24720 | URL: | https://www.aanda.org/articles/aa/pdf/2016/11/aa28764-16.pdf https://www.aanda.org/articles/aa/abs/2016/11/aa28764-16/aa28764-16.html |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201628764 | Bibcode ADS: | 2016A&A...595A.102B | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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