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Seasonal Mass Transfer on the Nucleus of Comet 67P/Churyumov-Gerasimenko

Keller, H. U. and Mottola, S. and Hviid, S. and Agarwal, J. and Kührt, E. and Skorov, Y. and Otto, K. and Vincent, Jean-Baptiste and Oklay, Nilda and Schröder, S.E. and Davidsson, B. and Pajola, M. and Shi, X. and Bodewits, Dennis and Toth, I. and Preusker, Frank and Scholten, Frank and A'Hearn, M. F. and Barbieri, M and Barucci, M. A. and Bertaux, J.-L. and Bertini, I. and Cremonese, G. and Da Deppo, V. and Debei, S. and De Cecco, M. and Fornasier, S. and Fulle, M. and Groussin, Olivier and Gutierrez, P.J. and Ip, W-H. and Jorda, L and Knollenberg, J. and Koschny, Detlef and Kramm, J. R. and Küppers, Michael and Lamy, P. and Lara López, Luisa M. and Lazzarin, M. and Lopez Moreno, J. and Marzari, F. and Naletto, G. and Rickman, Hans and Rodrigo, Rafael and Sierks, H. and Thomas, N. (2017) Seasonal Mass Transfer on the Nucleus of Comet 67P/Churyumov-Gerasimenko. Monthly Notices of the Royal Astronomical Society, 469, S357-S371. Oxford University Press. DOI: 10.1093/mnras/stx1726 ISSN 0035-8711

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Official URL: https://academic.oup.com/mnras/article/469/Suppl_2/S357/3964537/Seasonal-mass-transfer-on-the-nucleus-of-comet-67P

Abstract

We collect observational evidence that supports the scheme of mass transfer on the nucleus of comet 67P/Churyumov–Gerasimenko. The obliquity of the rotation axis of 67P causes strong seasonal variations. During perihelion the southern hemisphere is four times more active than the north. Northern territories are widely covered by granular material that indicates back fall originating from the active south. Decimetre sized chunks contain water ice and their trajectories are influenced by an antisolar force instigated by sublimation. OSIRIS observations suggest that up to 20 per cent of the particles directly return to the nucleus surface taking several hours of traveltime. The back fall covered northern areas are active if illuminated but produce mainly water vapour. The decimetre chunks from the nucleus surface are too small to contain more volatile compounds such as CO2 or CO. This causes a north–south dichotomy of the composition measurements in the coma. Active particles are trapped in the gravitational minimum of Hapi during northern winter. They are ‘shock frozen’ and only re-activated when the comet approaches the sun after its aphelion passage. The insolation of the big cavity is enhanced by self-heating, i.e. reflection and IR radiation from the walls. This, together with the pristinity of the active back fall, explains the early observed activity of the Hapi region. Sobek may be a role model for the consolidated bottom of Hapi. Mass transfer in the case of 67P strongly influences the evolution of the nucleus and the interpretation of coma measurements.

Item URL in elib:https://elib.dlr.de/113318/
Document Type:Article
Title:Seasonal Mass Transfer on the Nucleus of Comet 67P/Churyumov-Gerasimenko
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Keller, H. U.horst.keller (at) dlr.deUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Hviid, S.stubbe.hviid (at) dlr.deUNSPECIFIED
Agarwal, J.max-planck-institut für sonnensystemforschungUNSPECIFIED
Kührt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Skorov, Y.institut fur geophysik und extraterrestrische physik, universität braunschweigUNSPECIFIED
Otto, K.katharina.otto (at) dlr.deUNSPECIFIED
Vincent, Jean-BaptisteJean-Baptiste.Vincent (at) dlr.deUNSPECIFIED
Oklay, NildaNilda.OklayVincent (at) dlr.dehttps://orcid.org/0000-0002-4909-9692
Schröder, S.E.stefanus.schroeder (at) dlr.deUNSPECIFIED
Davidsson, B.astronomiska observatoriet, uppsala, swedenUNSPECIFIED
Pajola, M.cisas - center for studies and activities for space, university of padovaUNSPECIFIED
Shi, X.technical university berlin, germany ; shanghai astronomical observatory, shanghai, china,UNSPECIFIED
Bodewits, Dennisdepartment of astronomy, university of maryland, college park, md 20742-2421, usaUNSPECIFIED
Toth, I.konkoly observatory, mta csfk csiUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Scholten, Frankfrank.scholten (at) dlr.deUNSPECIFIED
A'Hearn, M. F.university of maryland, department of astronomy, maryland, usaUNSPECIFIED
Barbieri, Mlam, marseilleUNSPECIFIED
Barucci, M. A.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
Fornasier, S.observatoire de paris-meudon, franceUNSPECIFIED
Fulle, M.inaf - osservatorio astronomico di trieste, trieste, italyUNSPECIFIED
Groussin, Olivierlab. d'astrophysique de marseille, franceUNSPECIFIED
Gutierrez, P.J.iaa-csic, granada, spainUNSPECIFIED
Ip, W-H.institute for space science, national central university, chung li, taiwanUNSPECIFIED
Jorda, Llam, marseilleUNSPECIFIED
Knollenberg, J.joerg.knollenberg (at) dlr.deUNSPECIFIED
Koschny, Detlefestec, the netherlandsUNSPECIFIED
Kramm, J. R.max planck institute for solar systems research, katlenburg-lindau, germanyUNSPECIFIED
Küppers, Michaelmax-planck-institut für sonnensystemforschungUNSPECIFIED
Lamy, P.laboratoire d'astronomie spatiale, marseille, franceUNSPECIFIED
Lara López, Luisa M.iaa-csic granada, spainUNSPECIFIED
Lazzarin, M.department of astronomy, university of paduaUNSPECIFIED
Lopez Moreno, J.instituto de astrofifica de andalucia-consejo superior de investigaciones cientificas, granada, spainUNSPECIFIED
Marzari, F.università di padova, departimento di fisica, padova, italyUNSPECIFIED
Naletto, G.università di padova, departimento di elettronica et informatica, padova, italyUNSPECIFIED
Rickman, Hansuppsala astronomical observatoryUNSPECIFIED
Rodrigo, Rafaelinstituto de astrofisica de andaluciaUNSPECIFIED
Sierks, H.max-planck-institut für sonnensystemforschung, katlenburg-lindau, germanyUNSPECIFIED
Thomas, N.max-planck-institut für aeronomie, katlenburg-lindauUNSPECIFIED
Date:2017
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:469
DOI :10.1093/mnras/stx1726
Page Range:S357-S371
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:comet; individual 67P/Churyumov-Gerasimenko; data analysis
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:18 Sep 2017 14:06
Last Modified:06 Sep 2019 15:17

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