elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Seasonal erosion and restoration of the dust cover on comet 67P/Churyumov-Gerasimenko as observed by OSIRIS onboard Rosetta

Hu, X. and Shi, X. and Sierks, H. and Fulle, M. and Blum, J. and Keller, H. U. and Kührt, Ekkehard and Davidsson, B. J. R. and Güttler, C. and Gundlach, B. and Pajola, M. and Bodewits, D. and Vincent, Jean-Baptiste and Oklay, Nilda and Massironi, M. and Fornasier, S. and Tubiana, C. and Groussin, O. and Boudreault, S. and Höfner, S. and Mottola, Stefano and Barbieri, C. and Lamy, P. and Rodrigo, R. and Koschny, D. and Rickmann, H. and A'Hearn, M. F. and Agarwal, J. and Barucci, A. and Bertaux, J.-L. and Bertini, I. and Cremonese, G. and Da Deppo, V. and Debei, S. and De Cecco, M. and Deller, J. and El-Maarry, M. and Gicquel, A. and Gutierrez-Marques, P. and Gutierrez, P. J. and Hofmann, M. and Hviid, Stubbe and IP, W.-H. and Jorda, L. and Knollenberg, Jörg and Kovacs, Gabor and Kramm, J. R. and Küppers, M. and Lara, L. M. and Lazzarin, M. and Lopez-Moreno, J. J. and Marzari, F. and Naletto, G. and Thomas, N. (2017) Seasonal erosion and restoration of the dust cover on comet 67P/Churyumov-Gerasimenko as observed by OSIRIS onboard Rosetta. Astronomy & Astrophysics, 604, A114. EDP Sciences. DOI: 10.1051/0004-6361/201629910 ISSN 0004-6361

Full text not available from this repository.

Abstract

Context: Dust deposits or dust cover are a prevalent morphology in the northern hemi-nucleus of comet 67P/Churyumov-Gerasimenko (67P). The evolution of the dust deposits was captured by the OSIRIS camera system onboard the Rosetta spacecraft having escorted the comet for over two years. The observations shed light on the fundamental role of cometary activity in shaping and transforming the surface morphology. Aims. We aim to present OSIRIS observations of surface changes over the dust deposits before and after perihelion. The distribution of changes and a timeline of their occurrence are provided. We perform a data analysis to quantify the surface changes and investigate their correlation to water activity from the dust deposits.We further discuss how the results of our investigation are related to other findings from the Rosetta mission. Methods. Surface changes were detected via systematic comparison of images, and quantified using shape-from-shading technique. Thermal models were applied to estimate the erosion of water ice in response to the increasing insolation over the areas where surface changes occurred. Modeling results were used for the interpretation of the observed surface changes. Results. Surface changes discussed here were concentrated at mid-latitudes, between about 20°N and 40°N, marking a global transition from the dust-covered to rugged terrains. The changes were distributed in open areas exposed to ample solar illumination and likely subject to enhanced surface erosion before perihelion. The occurrence of changes followed the southward migration of the sub-solar point across the latitudes of their distribution. The erosion at locations of most changes was at least about 0:5 m, but most likely did not exceed several meters. The erosive features before perihelion had given way to a fresh, smooth cover of dust deposits after perihelion, suggesting that the dust deposits had been globally restored by at least about 1 m with ejecta from the intensely illuminated southern hemi-nucleus around perihelion, when the north was inactive during polar night. Conclusions. The erosion and restoration of the northern dust deposits are morphological expressions of seasonality on 67P. Based on observations and thermal modeling results, it is inferred that the dust deposits contained a few percent of water ice in mass on average. Local inhomogeneity in water abundance at spatial scales below tens of meters is likely. We suspect that dust ejected from the deposits may not have escaped the comet in bulk. That is, at least half of the ejected mass was afloat in the inner-coma or/and redeposited over other areas of the nucleus.

Item URL in elib:https://elib.dlr.de/116092/
Document Type:Article
Title:Seasonal erosion and restoration of the dust cover on comet 67P/Churyumov-Gerasimenko as observed by OSIRIS onboard Rosetta
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hu, X.max-planck-institut für sonnensystemforschung, justus-von-liebig-weg 3, 37077 göttingen, germanyUNSPECIFIED
Shi, X.max-planck-institut für sonnensystemforschung, justus-von- liebig-weg, 3 37077 göttingen, germanyUNSPECIFIED
Sierks, H.max-planck-institut für sonnensystemforschung, katlenburg-lindau, germanyUNSPECIFIED
Fulle, M.inaf - osservatorio astronomico di trieste, trieste, italyUNSPECIFIED
Blum, J.institut für geophysik und extraterrestrische physik (igep), technische universität braunschweig, mendelssohnstr. 3, 38106 braunschweig, germanyUNSPECIFIED
Keller, H. U.horst.keller (at) dlr.deUNSPECIFIED
Kührt, EkkehardEkkehard.Kuehrt (at) dlr.deUNSPECIFIED
Davidsson, B. J. R.jpl, PasadenaUNSPECIFIED
Güttler, C.max-planck-institut für sonnensystemforschung, justus-von-liebig-weg 3, 37077 göttingen, germanyUNSPECIFIED
Gundlach, B.institut für geophysik und extraterrestrische physik (igep), technische universität braunschweig, mendelssohnstr. 3, 38106 braunschweig, germanyUNSPECIFIED
Pajola, M.cisas - center for studies and activities for space, university of padovaUNSPECIFIED
Bodewits, D.department for astronomy, university of maryland, college park, md 20742-2421, usaUNSPECIFIED
Vincent, Jean-BaptisteJean-Baptiste.Vincent (at) dlr.deUNSPECIFIED
Oklay, NildaNilda.OklayVincent (at) dlr.dehttps://orcid.org/0000-0002-4909-9692
Massironi, M.dipartimento di geoscienze, università di padova, padua, italyUNSPECIFIED
Fornasier, S.lesia, obs. de paris, cnrs, univ paris 06, univ. paris-diderot, 5 place j. janssen, 92195 meudon, franceUNSPECIFIED
Tubiana, C.max-planck-institut für sonnensystemforschung, justus-von-liebig-weg 3, 37077 göttingen, germanyUNSPECIFIED
Groussin, O.laboratoire d'astrophysique de marseille, franceUNSPECIFIED
Boudreault, S.max-planck institut für sonnensystemforschung, justus-von-liebig-weg, 2 37077 göttingen, germanyUNSPECIFIED
Höfner, S.max-planck-institut für sonnensystemforschung, göttingen, germanyUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Barbieri, C.department of physics and astronomy, padova university, vicolo dell’osservatorio 3, 35122, padova, italyUNSPECIFIED
Lamy, P.laboratoire d'astronomie spatiale, marseille, franceUNSPECIFIED
Rodrigo, R.instituto de astrofísica de andalucía – csic, granada, spainUNSPECIFIED
Koschny, D.research and scientific support department, european space agency, 2201 noordwijk, the netherlandsUNSPECIFIED
Rickmann, H.pas space research center, bartycka , polandUNSPECIFIED
A'Hearn, M. F.university of maryland, college park, md 20742, usaUNSPECIFIED
Agarwal, J.max-planck-institut für sonnensystemforschung, justus-von-liebig-weg 3, 37077 göttingen, germanyUNSPECIFIED
Barucci, A.lesia observatoire de paris, meudon, franceUNSPECIFIED
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
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
Deller, J.max-planck institut für sonnensystemforschung, goettingen, germanyUNSPECIFIED
El-Maarry, M.SWRI, BoulderUNSPECIFIED
Gicquel, A.max-planck institut für sonnensystemforschung, justus-von-liebig-weg 3, d-37077 göttingen, germanyUNSPECIFIED
Gutierrez-Marques, P.max-planck-institut für sonnensystemforschung, justus-von-liebig-weg 3, 37077 göttingen, germanyUNSPECIFIED
Gutierrez, P. J.instituto de astrofísica de andalucía – csic, granada, spainUNSPECIFIED
Hofmann, M.max-planck institut für sonnensystemforschung, justus-von-liebig-weg, 3 d-37077 goettingen, germanyUNSPECIFIED
Hviid, StubbeStubbe.Hviid (at) dlr.deUNSPECIFIED
IP, W.-H.nationa central univ., institute of astronomy, chung-li, taiwanUNSPECIFIED
Jorda, L.laboratoire d'astrophysique de marseille, franceUNSPECIFIED
Knollenberg, JörgJoerg.Knollenberg (at) dlr.deUNSPECIFIED
Kovacs, Gabormax-planck-institut für sonnensystemforschung, justus-von-liebig-weg, 3, 37077, göttingen, germanyUNSPECIFIED
Kramm, J. R.max-planck-institut für sonnensystemforschung, justus-von-liebig-weg, 337077 göttingen, germanyUNSPECIFIED
Küppers, M.esa/esac, po box 78, 28691 villanueva de la cañada, spainUNSPECIFIED
Lara, L. M.instituto de astrofisica de andalucia, csic, granada, spainUNSPECIFIED
Lazzarin, M.university of padova, department of physics and astronomy, vicolo dell'osservatorio 3, 35122 padova, italyUNSPECIFIED
Lopez-Moreno, J. J.instituto de astrofisica de andalucia csic, glorieta de la astronomia, 18008, granada, spainUNSPECIFIED
Marzari, F.department of physics and astronomy "g. galilei", university of padova, vic. osservatorio 3, 35122 padova, italyUNSPECIFIED
Naletto, G.department of information engineering - university of padova, via gradenigo 6, 35131 padova, italyUNSPECIFIED
Thomas, N.physikalisches institut, sidlerstrasse 5, university of bern, ch-3012 bern, switzerlandUNSPECIFIED
Date:August 2017
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:604
DOI :10.1051/0004-6361/201629910
Page Range:A114
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:Rosetta, comets,67P/Churyumov-Gerasimenko, thermal modeling, erosion
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
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Kührt, Dr.rer.nat. Ekkehard
Deposited On:27 Nov 2017 10:12
Last Modified:08 Mar 2018 18:23

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.