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Spectrophotometric variegation of the layering in comet 67P/Churyumov-Gerasimenko as seen by OSIRIS

Tognon, G. and Ferrari, S. and Penasa, L. and La Forgia, F. and Massironi, M. and Naletto, G. and Lazzarin, M. and Cambianica, P. and Lucchetti, A. and Pajola, M. and Ferri, F. and Güttler, C. and Davidsson, B. and Deshapriya, J.D.P. and Fornasier, S. and Mottola, S. and Toth, I. and Sierks, H. and Lamy, P.L. and Rodrigo, R. and Koschny, D. and Barbieri, C. and Barucci, M. A. and Bertaux, J.-L. and Bertini, I. and Bodewits, D. and Cremonese, G. and Da Deppo, V. and Debei, S. and De Cecco, M. and Deller, J. and Franceschi, M. and Frattin, E. and Fulle, M. and Gutiérrez, P. J. and Ip, W.-H. and Keller, H.U. and Lara, L. M. and Lopez-Moreno, J. J. and Marzari, F. and Petropoulou, V. and Shi, X. and Tubiana, C. (2019) Spectrophotometric variegation of the layering in comet 67P/Churyumov-Gerasimenko as seen by OSIRIS. Astronomy & Astrophysics, 630, A16. EDP Sciences. doi: 10.1051/0004-6361/201834884. ISSN 0004-6361.

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Official URL: https://www.aanda.org/articles/aa/abs/2019/10/aa34884-18/aa34884-18.html

Abstract

Context. Between August 2014 and September 2016, the ESA space mission Rosetta escorted comet 7P/Churyumov-Gerasimenko (67P) during its perihelion passage. The onboard OSIRIS Narrow Angle Camera (NAC) acquired high-resolution multispectral Images of the cometary surface. These datasets allowed a characterization of the spectrophotometric variegation of the layering of the large lobe, correlated with the layer structural elevation. Aims. We perform a spectrophotometric characterization of the outcropping stratification of the small lobe of 67P as a function of ist structural elevation, and consequently, a spectrophotometric comparison of the layered outcrops of the two lobes. Methods. We selected two sequences of post-perihelion OSIRIS NAC images (~2.4 au outbound to the Sun), from which we built up two multispectral images, framing an extended geological section of the onion-like stratification of the small lobe. Then we classified the consolidated areas of the outcropping and the relative coarse deposits that were identified in the multispectral data with a two-class maximum likelihood method. For this, we defined the classes as a function of the structural elevation of the surface. Results. As a result, we identified a brightness variegation of the surface reflectance that is correlated with the structural elevation. The outer class, which is located at higher elevations, appears darker than the inner class. This fits previously obtained results for the large lobe. The reflectance values of the nucleus of 67P tend to decrease with increasing structural elevation. Conclusions. The observed spectrophotometric variegation can be due to a different texture as well as to a different content of volatiles and refractories.We suggest that the outer outcrops appear darker because they have been exposed longer, and the inner outcrops appear brighter because the surface has been more effectively rejuvenated.We interpret this variegation as the result of an evolutionary process.

Item URL in elib:https://elib.dlr.de/131582/
Document Type:Article
Title:Spectrophotometric variegation of the layering in comet 67P/Churyumov-Gerasimenko as seen by OSIRIS
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Tognon, G.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Ferrari, S.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Penasa, L.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIEDUNSPECIFIED
La Forgia, F.Università di Padova, Department of Physics and Astronomy, Vicolo dell'Osservatorio 2, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Massironi, M.Centro di Ateneo di Studi ed Attività Spaziali, "Giuseppe Colombo" (CISAS), University of Padova, via Venezia 15, 35131 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Naletto, G.Centro di Ateneo di Studi ed Attività Spaziali, "Giuseppe Colombo" (CISAS), University of Padova, via Venezia 15, 35131 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Lazzarin, M.Università di Padova, Department of Physics and Astronomy, Vicolo dell'Osservatorio 2, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Cambianica, P.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, 35131 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Lucchetti, A.Center of Studies and Activities for Space (CISAS) ‘G. Colombo’, Univer-UNSPECIFIEDUNSPECIFIED
Pajola, M.INAF Osservatorio Astronomico di Padova, Padova , ItalyUNSPECIFIEDUNSPECIFIED
Ferri, F.Center of Studies and Activities for Space (CISAS) “G. Colombo”, University of Padova, Via Venezia 15, I-35131 PadovaUNSPECIFIEDUNSPECIFIED
Güttler, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 337077 Göttingen, GermanyUNSPECIFIEDUNSPECIFIED
Davidsson, B.Jet Propulsion Laboratory, M/S 183-401, 4800 Oak Grove Drive, Pasadena, CA 91109, USAUNSPECIFIEDUNSPECIFIED
Deshapriya, J.D.P.observatoire de paris-meudon, franceUNSPECIFIEDUNSPECIFIED
Fornasier, S.LESIA-Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, FranceUNSPECIFIEDUNSPECIFIED
Mottola, S.UNSPECIFIEDhttps://orcid.org/0000-0002-0457-3872UNSPECIFIED
Toth, I.Observatory of the Hungarian Academy of Sciences, Budapest, HungaryUNSPECIFIEDUNSPECIFIED
Sierks, H.Max-Planck Institut fuer Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Goettingen, GermanyUNSPECIFIEDUNSPECIFIED
Lamy, P.L.Laboratoire d’Astrophysique de Marseille UMR 7326, CNRS & Aix Marseille Université, 13388 Marseille Cedex 13, FranceUNSPECIFIEDUNSPECIFIED
Rodrigo, R.Instituto de Astrofísica de Andalucía, CSIC, Granada, SpainUNSPECIFIEDUNSPECIFIED
Koschny, D.Research and Scientific Support Department of the European Space Agency, ESTEC, Noordwijk, The NetherlandsUNSPECIFIEDUNSPECIFIED
Barbieri, C.Department of Physics and Astronomy "G. Galilei", University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Barucci, M. A.LESIA – Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, FranceUNSPECIFIEDUNSPECIFIED
Bertaux, J.-L.LATMOS, CNRS/UVSQ/IPSL, 11 boulevard d’Alembert, 78280 Guyancourt, FranceUNSPECIFIEDUNSPECIFIED
Bertini, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bodewits, D.Physics Department, Auburn University, Auburn, AL 36849, USAUNSPECIFIEDUNSPECIFIED
Cremonese, G.INAF Astronomical observatory of Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Da Deppo, V.CNR-IFN UOS Padova LUXOR, via Trasea, 7, 35131 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Debei, S.University of Padova, Padova, ItalyUNSPECIFIEDUNSPECIFIED
De Cecco, M.Università di Padova, Center of Studies and Activities of Space (CISAS) "G.Colombo", Padova, ItalyUNSPECIFIEDUNSPECIFIED
Deller, J.Max-Planck Institut für Sonnensystemforschung, Goettingen, GermanyUNSPECIFIEDUNSPECIFIED
Franceschi, M.Geosciences Department, University of Padova, via G. Gradenigo 6, I-35131 Padova, ItalyUNSPECIFIEDUNSPECIFIED
Frattin, E.INAF-Astronomical Observatory of Padova, Vicolo dell’Osservatorio 5,UNSPECIFIEDUNSPECIFIED
Fulle, M.INAF – Osservatorio Astronomico di Trieste, via Tiepolo 11, 34143 Trieste, ItalyUNSPECIFIEDUNSPECIFIED
Gutiérrez, P. J.Instituto de Astrofisica de Andalucía (CSIC), Glorieta de la As- tronomía s/n, 18008 Granada, SpainUNSPECIFIEDUNSPECIFIED
Ip, W.-H.Institute for Space Science, National Central University, 32054, Chung-Li, TaiwanUNSPECIFIEDUNSPECIFIED
Keller, H.U.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lara, L. M.Instituto de Astrofisica de Andalucia, CSIC, Granada, SpainUNSPECIFIEDUNSPECIFIED
Lopez-Moreno, J. J.Instituto de Astrofisica de Andalucia CSIC, Glorieta de la Astronomia, 18008, Granada, SpainUNSPECIFIEDUNSPECIFIED
Marzari, F.Università di Padova, Departimento di Fisica, Padova, ItalyUNSPECIFIEDUNSPECIFIED
Petropoulou, V.Center of Studies and Activities for Space, CISAS, ‘G. Colombo’, UniversityUNSPECIFIEDUNSPECIFIED
Shi, X.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIEDUNSPECIFIED
Tubiana, C.Max-Planck Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077 Göttingen, GermanyUNSPECIFIEDUNSPECIFIED
Date:2019
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:630
DOI:10.1051/0004-6361/201834884
Page Range:A16
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:comets: general – comets: individual: 67P/Churyumov-Gerasimenko – methods: data analysis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project ROSETTA Instruments (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Mottola, Dr.phys. Stefano
Deposited On:03 Dec 2019 11:21
Last Modified:03 Dec 2019 11:21

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