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Modelling observations of the inner gas and dust coma of comet 67P/Churyumov-Gerasimenko using ROSINA/COPS and OSIRIS data: First results

Marschall, R. and Su, C.C. and Liao, Y. and Thomas, N. and Altwegg, Kathrin and Sierks, H. and Ip, W-H. and Keller, H. U. and Knollenberg, J. and Kührt, E. and Lai, I.L. and Rubin, M. and Skorov, Y. and Wu, J.S. and Jorda, L and Preusker, Frank and Scholten, Frank and Gracia-Berná, A. and Gicquel, A. and Naletto, G. and Shi, X. and Vincent, J.B. (2016) Modelling observations of the inner gas and dust coma of comet 67P/Churyumov-Gerasimenko using ROSINA/COPS and OSIRIS data: First results. Astronomy & Astrophysics. EDP Sciences. DOI: 10.1051/0004-6361/201628085 ISSN 0004-6361

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Abstract

Context. This paper describes the initial modelling of gas and dust data acquired in August and September 2014 from the European Space Agency’s Rosetta spacecraft when it was in close proximity to the nucleus of comet 67P/Churyumov-Gerasimenko. Aims. This work is an attempt to provide a self-consistent model of the innermost gas and dust coma of the comet, as constrained by the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) data set for the gas and by the Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) data set for the dust. Methods. The model uses a previously developed shape model for the nucleus, and from this the water sublimation rate and gas temperatures at the surface are computed with a simple thermal model. The gas expansion is modelled with a 3D parallel implementation of a Direct Simulation Monte Carlo algorithm. A dust drag algorithm is then used to produce dust densities in the coma, which are then converted to brightnesses using Mie theory and a line-of-sight integration. Results. We show that a purely insolation-driven model for surface outgassing does not produce a reasonable fit to ROSINA/COPS data. A stronger source in the “neck” region of the nucleus (region Hapi) is needed to match the observed modulation of the gas density in detail. This agrees with OSIRIS data, which shows that the dust emission from the “neck” was dominant in the August-September 2014 time frame. The current model matches this observation reasonably if a power index of 2–3 for the dust size distribution is used. A better match to the OSIRIS data is seen by using a single large particle size for the coma. Conclusions. We have shown possible solutions to the gas and dust distributions in the inner coma, which are consistent with ROSINA and OSIRIS data.

Item URL in elib:https://elib.dlr.de/109900/
Document Type:Article
Title:Modelling observations of the inner gas and dust coma of comet 67P/Churyumov-Gerasimenko using ROSINA/COPS and OSIRIS data: First results
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Marschall, R.physikalisches institut, sidlerstrasse 5, university of bern, ch-3012 bern, switzerlandUNSPECIFIED
Su, C.C.Department of Mechanical Engineering, National Chiao Tung University, 1001 Ta-Hsueh Road, Hsinchu 30010, TaiwanUNSPECIFIED
Liao, Y.Physikalisches Institut, Universität Bern, Sidlerstrasse 5, 3012 Bern, SwitzerlandUNSPECIFIED
Thomas, N.max-planck-institut für aeronomie, katlenburg-lindauUNSPECIFIED
Altwegg, Kathrinuniversity of berne, berne, switzerlandUNSPECIFIED
Sierks, H.max-planck-institut für sonnensystemforschung, katlenburg-lindau, germanyUNSPECIFIED
Ip, W-H.institute for space science, national central university, chung li, taiwanUNSPECIFIED
Keller, H. U.max-planck-institut für sonnensystemforschung, katlenburg-lindauUNSPECIFIED
Knollenberg, J.joerg.knollenberg (at) dlr.deUNSPECIFIED
Kührt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Lai, I.L.National Central University, Graduate Institute of Astronomy, 300 Chung-Da Rd, 32054 Chung-Li, TaiwanUNSPECIFIED
Rubin, M.physikalisches institut, university of bern, sidlerstrasse 5, 3012 bern, switzerlandUNSPECIFIED
Skorov, Y.institut fur geophysik und extraterrestrische physik, universität braunschweigUNSPECIFIED
Wu, J.S.Department of Mechanical Engineering, National Chiao Tung University, 1001 Ta-Hsueh Road, Hsinchu 30010, TaiwanUNSPECIFIED
Jorda, Llam, marseilleUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Scholten, Frankfrank.scholten (at) dlr.deUNSPECIFIED
Gracia-Berná, A.physikalisches institut, sidlerstrasse 5, university of bern, ch-3012 bern, switzerlandUNSPECIFIED
Gicquel, A.lesiaUNSPECIFIED
Naletto, G.università di padova, departimento di elettronica et informatica, padova, italyUNSPECIFIED
Shi, X.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077 Göttingen, GermanyUNSPECIFIED
Vincent, J.B.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
DOI :10.1051/0004-6361/201628085
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:comets: general / comets: individual: 67P/Churyumov-Gerasimenko / methods: data analysis / methods: numerical / acceleration of particles
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:21 Dec 2016 08:20
Last Modified:08 Mar 2018 18:23

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