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Changes in the physical environment of the inner coma of 67P/Churyumov-Gerasimenko with decreasing heliocentric distance

Bodewits, Dennis and Lara López, Luisa M. and A'Hearn, M. F. and La Forgia, Fiorangela and Gicquel, A. and Kovacs, G. and Knollenberg, J. and Lazzarin, M. and Lin, Z.-Y. and Shi, X. and Snodgrass, C. and Tubiana, C. and Sierks, H. and Barbieri, C. and Lamy, P. and Rodrigo, Rafael and Koschny, D. and Rickman, H. and Keller, H.U. and Barucci, M. A. and Bertaux, J.-L. and Bertini, I. and Boudreault, S. and Cremonese, G. and Da Deppo, V. and Davidsson, B. and Debei, S. and De Cecco, M. and Fornasier, S. and Fulle, M. and Groussin, Olivier and Gutierrez, P. J. and Güttler, C. and Hviid, S. and Ip, W-H. and Jorda, L. and Kramm, J. R. and Kührt, E. and Küppers, Michael and Lopez-Moreno, J. and Marzari, F. and Naletto, G. and Oklay, N. and Thomas, N. and Toth, I. and Vincent, J.B. (2016) Changes in the physical environment of the inner coma of 67P/Churyumov-Gerasimenko with decreasing heliocentric distance. Journal of the Astronautical Sciences. American Astronautical Society. doi: 10.3847/0004-6256/152/5/130. ISSN 0021-9142.

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Abstract

The Wide Angle Camera of the OSIRIS instrument on board the Rosetta spacecraft is equipped with several narrow-band filters that are centered on the emission lines and bands of various fragment species. These are used to determine the evolution of the production and spatial distribution of the gas in the inner coma of comet 67P with time and heliocentric distance, here between 2.6 and 1.3 au pre-perihelion. Our observations indicate that the emission observed in the OH, OI, CN, NH, and NH2 filters is mostly produced by dissociative electron impact excitation of different parent species. We conclude that CO2 rather than H2O is a significant source of the [OI] 630 nm emission. A strong plume-like feature observed in the CN and OI filters is present throughout our observations. This plume is not present in OH emission and indicates a local enhancement of the CO2/H2O ratio by as much as a factor of 3. We observed a sudden decrease in intensity levels after 2015 March, which we attribute to decreased electron temperatures in the first few kilometers above the surface of the nucleus.

Item URL in elib:https://elib.dlr.de/108201/
Document Type:Article
Title:Changes in the physical environment of the inner coma of 67P/Churyumov-Gerasimenko with decreasing heliocentric distance
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bodewits, Dennisdepartment of astronomy, university of maryland, college park, md 20742-2421, usaUNSPECIFIEDUNSPECIFIED
Lara López, Luisa M.iaa-csic granada, spainUNSPECIFIEDUNSPECIFIED
A'Hearn, M. F.university of maryland, department of astronomy, maryland, usaUNSPECIFIEDUNSPECIFIED
La Forgia, Fiorangelauniversity of padova, department of physics and astronomy, vicolo dell'osservatorio 3, 35122 padova, italyUNSPECIFIEDUNSPECIFIED
Gicquel, A.lesiaUNSPECIFIEDUNSPECIFIED
Kovacs, G.max–planck–institut für sonnensystemforschung, justus–von–UNSPECIFIEDUNSPECIFIED
Knollenberg, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lazzarin, M.department of astronomy, university of paduaUNSPECIFIEDUNSPECIFIED
Lin, Z.-Y.national central university, jhongli, taoyuan, taiwanUNSPECIFIEDUNSPECIFIED
Shi, X.technical university berlin, germany ; shanghai astronomical observatory, shanghai, china,UNSPECIFIEDUNSPECIFIED
Snodgrass, C.max-planck-institut für sonnensystemforschung, göttingen, germanyUNSPECIFIEDUNSPECIFIED
Tubiana, C.max-planck-institut fuer sonnensystemforschung, germanyUNSPECIFIEDUNSPECIFIED
Sierks, H.max-planck-institut für sonnensystemforschung, katlenburg-lindau, germanyUNSPECIFIEDUNSPECIFIED
Barbieri, C.university of padova, padova, italyUNSPECIFIEDUNSPECIFIED
Lamy, P.laboratoire d'astronomie spatiale, marseille, franceUNSPECIFIEDUNSPECIFIED
Rodrigo, Rafaelinstituto de astrofisica de andaluciaUNSPECIFIEDUNSPECIFIED
Koschny, D.research and scientific support department, european space agency, 2201 noordwijk, the netherlandsUNSPECIFIEDUNSPECIFIED
Rickman, H.department of physics and astronomy, uppsala university, 75120 uppsala, swedenUNSPECIFIEDUNSPECIFIED
Keller, H.U.max-planck-institut für aeronomie, katlenburg-lindauUNSPECIFIEDUNSPECIFIED
Barucci, M. A.observatoire de paris, meudon, franceUNSPECIFIEDUNSPECIFIED
Bertaux, J.-L.laboratoire atmosphères, milieux, observations spatiales, cnrs/uvsq/upmc, 11 boulevard d’alembert, 78280 guyancourt, franceUNSPECIFIEDUNSPECIFIED
Bertini, I.dipartimento di astronomia, università di padova, padova, italyUNSPECIFIEDUNSPECIFIED
Boudreault, S.max-planck-institut für sonnensystemforschung, 37077 göttingen, germanyUNSPECIFIEDUNSPECIFIED
Cremonese, G.osservatorio astronomico, padova, italyUNSPECIFIEDUNSPECIFIED
Da Deppo, V.consiglio nazionale delle ricerche-istituto nazionale per la fisica della materia, luxor, padova, italyUNSPECIFIEDUNSPECIFIED
Davidsson, B.astronomiska observatoriet, uppsala, swedenUNSPECIFIEDUNSPECIFIED
Debei, S.università di padova, center of studies and activities of space (cisas) "g.colombo", padova, italyUNSPECIFIEDUNSPECIFIED
De Cecco, M.università di padova, center of studies and activities of space (cisas) "g.colombo", padova, italyUNSPECIFIEDUNSPECIFIED
Fornasier, S.observatoire de paris-meudon, franceUNSPECIFIEDUNSPECIFIED
Fulle, M.inaf osservatorio astronomico di trieste, via tiepolo 11, 34143, trieste, italyUNSPECIFIEDUNSPECIFIED
Groussin, Olivierlab. d'astrophysique de marseille, franceUNSPECIFIEDUNSPECIFIED
Gutierrez, P. J.instituto de astrofísica de andalucía – csic, granada, spainUNSPECIFIEDUNSPECIFIED
Güttler, C.max-planck-institut für sonnensystemforschungUNSPECIFIEDUNSPECIFIED
Hviid, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ip, W-H.institute for space science, national central university, chung li, taiwanUNSPECIFIEDUNSPECIFIED
Jorda, L.laboratoire d'astrophysique de marseille, franceUNSPECIFIEDUNSPECIFIED
Kramm, J. R.max planck institute for solar systems research, katlenburg-lindau, germanyUNSPECIFIEDUNSPECIFIED
Kührt, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Küppers, Michaelmax-planck-institut für sonnensystemforschungUNSPECIFIEDUNSPECIFIED
Lopez-Moreno, J.instituto de astrofisica de andaluciaUNSPECIFIEDUNSPECIFIED
Marzari, F.università di padova, departimento di fisica, padova, italyUNSPECIFIEDUNSPECIFIED
Naletto, G.università di padova, departimento di elettronica et informatica, padova, italyUNSPECIFIEDUNSPECIFIED
Oklay, N.max-planck-institut für sonnensystemforschungUNSPECIFIEDUNSPECIFIED
Thomas, N.max-planck-institut für aeronomie, katlenburg-lindauUNSPECIFIEDUNSPECIFIED
Toth, I.konkoly observatory, mta csfk csiUNSPECIFIEDUNSPECIFIED
Vincent, J.B.max-planck-institut fuer sonnensystemforschung, germanyUNSPECIFIEDUNSPECIFIED
Date:2016
Journal or Publication Title:Journal of the Astronautical Sciences
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.3847/0004-6256/152/5/130
Publisher:American Astronautical Society
ISSN:0021-9142
Status:Published
Keywords:atomic processes, comets: individual: 67P/Churyumov--Gerasimenko, molecular processes, plasmas, radiation mechanisms: non-thermal, techniques: image processing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project ROSETTA Instruments (old), R - Projekt ROSETTA Lander (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Schubert, Renate
Deposited On:24 Nov 2016 10:25
Last Modified:06 Sep 2019 15:20

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