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

M. A. Barucci; G. Filacchione; S. Fornasier; A. Raponi; J. D.P. Deshapriya; F. Tosi; C. Feller; M. Ciarniello; H. Sierks; F. Capaccioni; A. Pommerol; M. Massironi; N. Oklay; F. Merlin; J. B. Vincent; M. Fulchignoni; A. Guilbert-Lepoutre; D. Perna; M. T. Capria; P. H. Hasselmann; B. Rousseau; C. Barbieri; D. Bockelée-Morvan; P. L. Lamy; C. De Sanctis; R. Rodrigo; S. Erard; D. Koschny; C. Leyrat; H. Rickman; P. Drossart; H. U. Keller; M. F. A'Hearn; G. Arnold; J. L. Bertaux; I. Bertini; P. Cerroni; G. Cremonese; V. Da Deppo; B. J.R. Davidsson; M. R. El-Maarry; S. Fonti; M. Fulle; O. Groussin; C. Güttler; S. F. Hviid; W. Ip; L. Jorda; D. Kappel; J. Knollenberg; J. R. Kramm; E. Kührt; M. Küppers; L. Lara; M. Lazzarin; J. J. Lopez Moreno; F. Mancarella; F. Marzari; S. Mottola; G. Naletto; M. Pajola; E. Palomba; E. Quirico; B. Schmitt; N. Thomas; C. Tubiana

doi:10.1051/0004-6361/201628764

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

M. A. Barucci, G. Filacchione, S. Fornasier, A. Raponi, J. D.P. Deshapriya, F. Tosi, C. Feller, M. Ciarniello, H. Sierks, F. Capaccioni, A. Pommerol, M. Massironi, N. Oklay, F. Merlin, J. B. Vincent, M. Fulchignoni, A. Guilbert-Lepoutre, D. Perna, M. T. Capria, P. H. HasselmannB. Rousseau, C. Barbieri, D. Bockelée-Morvan, P. L. Lamy, C. De Sanctis, R. Rodrigo, S. Erard, D. Koschny, C. Leyrat, H. Rickman, P. Drossart, H. U. Keller, M. F. A'Hearn, G. Arnold, J. L. Bertaux, I. Bertini, P. Cerroni, G. Cremonese, V. Da Deppo, B. J.R. Davidsson, M. R. El-Maarry, S. Fonti, M. Fulle, O. Groussin, C. Güttler, S. F. Hviid, W. Ip, L. Jorda, D. Kappel, J. Knollenberg, J. R. Kramm, E. Kührt, M. Küppers, L. Lara, M. Lazzarin, J. J. Lopez Moreno, F. Mancarella, F. Marzari, S. Mottola, G. Naletto, M. Pajola, E. Palomba, E. Quirico, B. Schmitt, N. Thomas, C. Tubiana

Graduate Institute of Astronomy

Research output: Contribution to journal › Article › peer-review

69 Scopus citations

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.

Original language	English
Article number	A102
Journal	Astronomy and Astrophysics
Volume	595
DOIs	https://doi.org/10.1051/0004-6361/201628764
State	Published - 1 Nov 2016

Keywords

Comets: individual: 67P/Churyumov-Gerasimenko
Methods: data analysis
Techniques: image processing
Techniques: imaging spectroscopy
Techniques: photometric

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10.1051/0004-6361/201628764

Cite this

Barucci, M. A., Filacchione, G., Fornasier, S., Raponi, A., Deshapriya, J. D. P., Tosi, F., Feller, C., Ciarniello, M., Sierks, H., Capaccioni, F., Pommerol, A., Massironi, M., Oklay, N., Merlin, F., Vincent, J. B., Fulchignoni, M., Guilbert-Lepoutre, A., Perna, D., Capria, M. T., ... Tubiana, C. (2016). Detection of exposed H₂O ice on the nucleus of comet 67P/Churyumov-Gerasimenko: As observed by Rosetta OSIRIS and VIRTIS instruments. Astronomy and Astrophysics, 595, Article A102. https://doi.org/10.1051/0004-6361/201628764

@article{a8dbaef7145a43e99edb7ffa153f9489,

title = "Detection of exposed H2O ice on the nucleus of comet 67P/Churyumov-Gerasimenko: As observed by Rosetta OSIRIS and VIRTIS instruments",

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.",

keywords = "Comets: individual: 67P/Churyumov-Gerasimenko, Methods: data analysis, Techniques: image processing, Techniques: imaging spectroscopy, Techniques: photometric",

author = "Barucci, {M. A.} and G. Filacchione and S. Fornasier and A. Raponi and Deshapriya, {J. D.P.} and F. Tosi and C. Feller and M. Ciarniello and H. Sierks and F. Capaccioni and A. Pommerol and M. Massironi and N. Oklay and F. Merlin and Vincent, {J. B.} and M. Fulchignoni and A. Guilbert-Lepoutre and D. Perna and Capria, {M. T.} and Hasselmann, {P. H.} and B. Rousseau and C. Barbieri and D. Bockel{\'e}e-Morvan and Lamy, {P. L.} and {De Sanctis}, C. and R. Rodrigo and S. Erard and D. Koschny and C. Leyrat and H. Rickman and P. Drossart and Keller, {H. U.} and A'Hearn, {M. F.} and G. Arnold and Bertaux, {J. L.} and I. Bertini and P. Cerroni and G. Cremonese and {Da Deppo}, V. and Davidsson, {B. J.R.} and El-Maarry, {M. R.} and S. Fonti and M. Fulle and O. Groussin and C. G{\"u}ttler and Hviid, {S. F.} and W. Ip and L. Jorda and D. Kappel and J. Knollenberg and Kramm, {J. R.} and E. K{\"u}hrt and M. K{\"u}ppers and L. Lara and M. Lazzarin and {Lopez Moreno}, {J. J.} and F. Mancarella and F. Marzari and S. Mottola and G. Naletto and M. Pajola and E. Palomba and E. Quirico and B. Schmitt and N. Thomas and C. Tubiana",

note = "Publisher Copyright: {\textcopyright} ESO, 2016.",

year = "2016",

month = nov,

day = "1",

doi = "10.1051/0004-6361/201628764",

language = "???core.languages.en_GB???",

volume = "595",

journal = "Astronomy and Astrophysics",

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Barucci, MA, Filacchione, G, Fornasier, S, Raponi, A, Deshapriya, JDP, Tosi, F, Feller, C, Ciarniello, M, Sierks, H, Capaccioni, F, Pommerol, A, Massironi, M, Oklay, N, Merlin, F, Vincent, JB, Fulchignoni, M, Guilbert-Lepoutre, A, Perna, D, Capria, MT, Hasselmann, PH, Rousseau, B, Barbieri, C, Bockelée-Morvan, D, Lamy, PL, De Sanctis, C, Rodrigo, R, Erard, S, Koschny, D, Leyrat, C, Rickman, H, Drossart, P, Keller, HU, A'Hearn, MF, Arnold, G, Bertaux, JL, Bertini, I, Cerroni, P, Cremonese, G, Da Deppo, V, Davidsson, BJR, El-Maarry, MR, Fonti, S, Fulle, M, Groussin, O, Güttler, C, Hviid, SF, Ip, W, Jorda, L, Kappel, D, Knollenberg, J, Kramm, JR, Kührt, E, Küppers, M, Lara, L, Lazzarin, M, Lopez Moreno, JJ, Mancarella, F, Marzari, F, Mottola, S, Naletto, G, Pajola, M, Palomba, E, Quirico, E, Schmitt, B, Thomas, N & Tubiana, C 2016, 'Detection of exposed H₂O ice on the nucleus of comet 67P/Churyumov-Gerasimenko: As observed by Rosetta OSIRIS and VIRTIS instruments', Astronomy and Astrophysics, vol. 595, A102. https://doi.org/10.1051/0004-6361/201628764

TY - JOUR

T1 - Detection of exposed H2O ice on the nucleus of comet 67P/Churyumov-Gerasimenko

T2 - As observed by Rosetta OSIRIS and VIRTIS instruments

AU - Barucci, M. A.

AU - Filacchione, G.

AU - Fornasier, S.

AU - Raponi, A.

AU - Deshapriya, J. D.P.

AU - Tosi, F.

AU - Feller, C.

AU - Ciarniello, M.

AU - Sierks, H.

AU - Capaccioni, F.

AU - Pommerol, A.

AU - Massironi, M.

AU - Oklay, N.

AU - Merlin, F.

AU - Vincent, J. B.

AU - Fulchignoni, M.

AU - Guilbert-Lepoutre, A.

AU - Perna, D.

AU - Capria, M. T.

AU - Hasselmann, P. H.

AU - Rousseau, B.

AU - Barbieri, C.

AU - Bockelée-Morvan, D.

AU - Lamy, P. L.

AU - De Sanctis, C.

AU - Rodrigo, R.

AU - Erard, S.

AU - Koschny, D.

AU - Leyrat, C.

AU - Rickman, H.

AU - Drossart, P.

AU - Keller, H. U.

AU - A'Hearn, M. F.

AU - Arnold, G.

AU - Bertaux, J. L.

AU - Bertini, I.

AU - Cerroni, P.

AU - Cremonese, G.

AU - Da Deppo, V.

AU - Davidsson, B. J.R.

AU - El-Maarry, M. R.

AU - Fonti, S.

AU - Fulle, M.

AU - Groussin, O.

AU - Güttler, C.

AU - Hviid, S. F.

AU - Ip, W.

AU - Jorda, L.

AU - Kappel, D.

AU - Knollenberg, J.

AU - Kramm, J. R.

AU - Kührt, E.

AU - Küppers, M.

AU - Lara, L.

AU - Lazzarin, M.

AU - Lopez Moreno, J. J.

AU - Mancarella, F.

AU - Marzari, F.

AU - Mottola, S.

AU - Naletto, G.

AU - Pajola, M.

AU - Palomba, E.

AU - Quirico, E.

AU - Schmitt, B.

AU - Thomas, N.

AU - Tubiana, C.

PY - 2016/11/1

Y1 - 2016/11/1

N2 - 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.

AB - 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.

KW - Comets: individual: 67P/Churyumov-Gerasimenko

KW - Methods: data analysis

KW - Techniques: image processing

KW - Techniques: imaging spectroscopy

KW - Techniques: photometric

UR - http://www.scopus.com/inward/record.url?scp=84995785744&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201628764

DO - 10.1051/0004-6361/201628764

M3 - 期刊論文

AN - SCOPUS:84995785744

SN - 0004-6361

VL - 595

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A102