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Variegation of comet 67P/Churyumov-Gerasimenko in regions showing activity

Oklay, N. and Vincent, J.B. and Fornasier, S. and Pajola, M. and Besse, Sebastien and Davidsson, B. and Lara López, Luisa M. and Mottola, S. and Naletto, G. and Sierks, H. and Barucci, M. A. and Scholten, Frank and Preusker, Frank and Pommerol, Antoine and Masoumzadeh, Nafiseh and Lazzarin, M. and Barbieri, C. and Lamy, P. and Rodrigo, Rafael and Koschny, Detlef and Rickman, Hans and A'Hearn, M. F. and Bertaux, J.-L. and Bertini, I. and Bodewits, Dennis and Cremonese, G. and Da Deppo, V. and Debei, S. and De Cecco, M. and Fulle, M. and Groussin, Olivier and Gutierrez, P.J. and Güttler, C. and Hall, I. and Hofmann, M. and Hviid, S. and Ip, W-H. and Jorda, L and Keller, H.-U. and Knollenberg, J. and Kovacs, G. and Kramm, J. R. and Kührt, Ekkehard and Küppers, Michael and Lin, Z.-Y. and Lopez-Moreno, J. and Marzari, F. and Moreno, F. and Shi, X. and Thomas, N. and Toth, I. and Tubiana, C. (2016) Variegation of comet 67P/Churyumov-Gerasimenko in regions showing activity. Astronomy & Astrophysics, 586, A80. EDP Sciences. DOI: 10.1051/0004-6361/201527369 ISSN 0004-6361

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Abstract

Aims.We carried out an investigation of the surface variegation of comet 67P/Churyumov-Gerasimenko, the detection of regions showing activity, the determination of active and inactive surface regions of the comet with spectral methods, and the detection of fallback material. Methods. We analyzed multispectral data generated with Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) narrow angle camera (NAC) observations via spectral techniques, reflectance ratios, and spectral slopes in order to study active regions. We applied clustering analysis to the results of the reflectance ratios, and introduced the new technique of activity thresholds to detect areas potentially enriched in volatiles. Results. Local color inhomogeneities are detected over the investigated surface regions. Active regions, such as Hapi, the active pits of Seth and Ma’at, the clustered and isolated bright features in Imhotep, the alcoves in Seth and Ma’at, and the large alcove in Anuket, have bluer spectra than the overall surface. The spectra generated with OSIRIS NAC observations are dominated by cometary emissions of around 700 nm to 750 nm as a result of the coma between the comet’s surface and the camera. One of the two isolated bright features in the Imhotep region displays an absorption band of around 700 nm, which probably indicates the existence of hydrated silicates. An absorption band with a center between 800–900 nm is tentatively observed in some regions of the nucleus surface. This absorption band can be explained by the crystal field absorption of Fe2+, which is a common spectral feature seen in silicates.

Item URL in elib:https://elib.dlr.de/109958/
Document Type:Article
Title:Variegation of comet 67P/Churyumov-Gerasimenko in regions showing activity
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Oklay, N.max-planck-institut für sonnensystemforschungUNSPECIFIED
Vincent, J.B.max-planck-institut fuer sonnensystemforschung, germanyUNSPECIFIED
Fornasier, S.observatoire de paris-meudon, franceUNSPECIFIED
Pajola, M.cisas - center for studies and activities for space, university of padovaUNSPECIFIED
Besse, Sebastienscientific support office, european space agency, 2201, noordwijk, netherlands.UNSPECIFIED
Davidsson, B.astronomiska observatoriet, uppsala, swedenUNSPECIFIED
Lara López, Luisa M.iaa-csic granada, spainUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Naletto, G.università di padova, departimento di elettronica et informatica, padova, italyUNSPECIFIED
Sierks, H.max-planck-institut für sonnensystemforschung, katlenburg-lindau, germanyUNSPECIFIED
Barucci, M. A.observatoire de paris, meudon, franceUNSPECIFIED
Scholten, Frankfrank.scholten (at) dlr.deUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Pommerol, Antoinephysikalisches institut, sidlerstrasse 5, university of bern, 3012, bern, switzerlandUNSPECIFIED
Masoumzadeh, Nafisehmax planck institute for solar system research, katlenburg-lindau, germanyUNSPECIFIED
Lazzarin, M.department of astronomy, university of paduaUNSPECIFIED
Barbieri, C.university of padova, padova, italyUNSPECIFIED
Lamy, P.laboratoire d'astronomie spatiale, marseille, franceUNSPECIFIED
Rodrigo, Rafaelinstituto de astrofisica de andaluciaUNSPECIFIED
Koschny, Detlefestec, the netherlandsUNSPECIFIED
Rickman, Hansuppsala astronomical observatoryUNSPECIFIED
A'Hearn, M. F.university of maryland, department of astronomy, maryland, usaUNSPECIFIED
Bertaux, J.-L.laboratoire atmosphères, milieux, observations spatiales, cnrs/uvsq/upmc, 11 boulevard d’alembert, 78280 guyancourt, franceUNSPECIFIED
Bertini, I.dipartimento di astronomia, università di padova, padova, italyUNSPECIFIED
Bodewits, Dennisdepartment of astronomy, university of maryland, college park, md 20742-2421, usaUNSPECIFIED
Cremonese, G.osservatorio astronomico, padova, italyUNSPECIFIED
Da Deppo, V.consiglio nazionale delle ricerche-istituto nazionale per la fisica della materia, luxor, padova, italyUNSPECIFIED
Debei, S.università di padova, center of studies and activities of space (cisas) "g.colombo", padova, italyUNSPECIFIED
De Cecco, M.università di padova, center of studies and activities of space (cisas) "g.colombo", padova, italyUNSPECIFIED
Fulle, M.inaf - osservatorio astronomico di trieste, trieste, italyUNSPECIFIED
Groussin, Olivierlab. d'astrophysique de marseille, franceUNSPECIFIED
Gutierrez, P.J.iaa-csic, granada, spainUNSPECIFIED
Güttler, C.max-planck-institut für sonnensystemforschungUNSPECIFIED
Hall, I.max planck institute for solar system research , katlenburg-lindau, germanyUNSPECIFIED
Hofmann, M.max-planck-institut für sonnensystemforschung, göttingen, germanyUNSPECIFIED
Hviid, S.stubbe.hviid (at) dlr.deUNSPECIFIED
Ip, W-H.institute for space science, national central university, chung li, taiwanUNSPECIFIED
Jorda, Llam, marseilleUNSPECIFIED
Keller, H.-U.max-planck-institut für aeronomie, katlenburg-lindauUNSPECIFIED
Knollenberg, J.joerg.knollenberg (at) dlr.deUNSPECIFIED
Kovacs, G.max–planck–institut für sonnensystemforschung, justus–von–UNSPECIFIED
Kramm, J. R.max planck institute for solar systems research, katlenburg-lindau, germanyUNSPECIFIED
Kührt, Ekkehardekkehard.kuehrt (at) dlr.deUNSPECIFIED
Küppers, Michaelmax-planck-institut für sonnensystemforschungUNSPECIFIED
Lin, Z.-Y.national central university, jhongli, taoyuan, taiwanUNSPECIFIED
Lopez-Moreno, J.instituto de astrofisica de andaluciaUNSPECIFIED
Marzari, F.università di padova, departimento di fisica, padova, italyUNSPECIFIED
Moreno, F.instituto de astrofísica de andalucía, consejo superior de investigaciones científicas (csic), p.o. box 3008, 18080 granada, spainUNSPECIFIED
Shi, X.technical university berlin, germany ; shanghai astronomical observatory, shanghai, china,UNSPECIFIED
Thomas, N.max-planck-institut für aeronomie, katlenburg-lindauUNSPECIFIED
Toth, I.konkoly observatory, mta csfk csiUNSPECIFIED
Tubiana, C.max-planck-institut fuer sonnensystemforschung, germanyUNSPECIFIED
Date:2016
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:586
DOI :10.1051/0004-6361/201527369
Page Range:A80
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:comets: individual: 67P/Churyumov-Gerasimenko / methods: data analysis / techniques: image processing / techniques: imaging spectroscopy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Instrumente, R - Projekt ROSETTA Lander
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Institute of Planetary Research > Planetary Geodesy
Deposited By: Schubert, Renate
Deposited On:22 Dec 2016 09:49
Last Modified:08 Mar 2018 18:23

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