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Time evolution of dust deposits in the Hapi region of comet 67P/Churyumov-Gerasimenko

Cambianica, P and Fulle, M. and Cremonese, G. and Simioni, E. and Naletto, G. and Massironi, M. and Penasa, L. and Lucchetti, A. and Pajola, M. and Bertini, I and Bodewits, D. and Ceccarelli, C. and Ferri, F. and Fornasier, S. and Frattin, E. and Güttler, C. and Guiterrez, P. and Keller, H. and Kührt, E. and Küppers, M. and La Forgia, F. and Lazzarin, M and Marzari, F. and Mottola, S. and Sierks, H. and Toth, I. and Tubiana, C. and Vincent, J. B. (2020) Time evolution of dust deposits in the Hapi region of comet 67P/Churyumov-Gerasimenko. Astronomy & Astrophysics, 636 (A91). EDP Sciences. DOI: 10.1051/0004-6361/202037485 ISSN 0004-6361

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Aims. We provide a measurement of the seasonal evolution of the dust deposit erosion and accretion in the Hapi region of comet 67P/Churyumov-Gerasimenko with a vertical accuracy of 0.2–0.9 m. Methods. We used OSIRIS Narrow Angle Camera images with a spatial scale of lower than 1.30 m px−1 and developed a tool to monitor the time evolution of 22 boulder heights with respect to the surrounding dust deposit. The tool is based on the measurement of the shadow length projected by the boulder on the surrounding pebble deposit. Assuming the position of the boulders does not change during the observational period, boulder height variations provide an indication of how the thickness of the surrounding dust layer varies over time through erosion and accretion phenomena. Results. We measured an erosion of the dust deposit of 1.7 ± 0.2 m during the inbound orbit until 12 December, 2014. This value nearly balances the fallout from the southern hemisphere during perihelion cometary activity. During the perihelion phase, the dust deposit then increased by 1.4 ± 0.8 m. This is interpreted as a direct measurement of the fallout thickness. By comparing the erosion rate and dust volume loss rate at the Hapi region measured in the coma, the fallout represents ~96% in volume of the ejecta. The amount of the eroded pristine material from the southern hemisphere, together with its subsequent transport and fallout on the nucleus, led us to discuss the pristine water ice abundance in comet 67P. We determine that the refractory-to-ice mass ratio ranges from 6 to 110 in the perihelion-eroded pristine nucleus, providing a pristine ice mass fraction of (8 ± 7)% in mass.

Item URL in elib:https://elib.dlr.de/135525/
Document Type:Article
Title:Time evolution of dust deposits in the Hapi region of comet 67P/Churyumov-Gerasimenko
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Cambianica, PUniversity of Padova, ItalyUNSPECIFIED
Fulle, M.University of Trento, ItalyUNSPECIFIED
Cremonese, G.University of Padova, ItalyUNSPECIFIED
Simioni, E.University of Padova, ItalyUNSPECIFIED
Naletto, G.University of Padova, ItalyUNSPECIFIED
Massironi, M.University of Padova, ItalyUNSPECIFIED
Penasa, L.University of Padova, ItalyUNSPECIFIED
Lucchetti, A.University of Padova, ItalyUNSPECIFIED
Pajola, M.University of Padova, ItalyUNSPECIFIED
Bertini, IUniversity of Padova,ItalyUNSPECIFIED
Bodewits, D.Auburn University, Auburn, ALUNSPECIFIED
Ceccarelli, C.University Grenoble AlpesUNSPECIFIED
Ferri, F.University of Padova, ItalyUNSPECIFIED
Fornasier, S.Obs. de Paris, FranceUNSPECIFIED
Frattin, E.University of Padova, ItalyUNSPECIFIED
Güttler, C.Max-Planck-Institut für SonnensystemforschungUNSPECIFIED
Guiterrez, P.Instituto de Astrofisica de Andalucia, Granada, SpainUNSPECIFIED
Keller, H.Universität Braunschweig and DLR-PFUNSPECIFIED
Kührt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
La Forgia, F.University of Padova, ItalyUNSPECIFIED
Lazzarin, MUniversity of Padova, ItalyUNSPECIFIED
Marzari, F.University of Padova, ItalyUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Sierks, H.Max-Planck-Institut für Sonnensystemforschung, GöttingenUNSPECIFIED
Toth, I.Konkoly Observatory, HungaryUNSPECIFIED
Tubiana, C.Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, GermanyUNSPECIFIED
Vincent, J. B.jean-baptiste.vincent (at) dlr.deUNSPECIFIED
Date:April 2020
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1051/0004-6361/202037485
Publisher:EDP Sciences
Keywords:comets: general / comets: individual: 67P/Churyumov-Gerasimenko / methods: data analysis / methods: numerical
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 Optical Sensor Systems > Space Instruments
Institute of Planetary Research > Planetary Geodesy
Deposited By: Kührt, Dr.rer.nat. Ekkehard
Deposited On:13 Jul 2020 11:31
Last Modified:10 Aug 2020 13:01

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