Article (Scientific journals)
Ground-based monitoring of comet 67P/Churyumov–Gerasimenko gas activity throughout the Rosetta mission
Opitom, C.; Snodgrass, C.; Fitzsimmons, A. et al.
2017In Monthly Notices of the Royal Astronomical Society, 469, p. 222-S229
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Keywords :
comets: individual: 67P/Churyumov-Gerasimenko
Abstract :
[en] Simultaneously to the ESA Rosetta mission, a world-wide ground-based campaign provided measurements of the large scale activity of comet 67P/Churyumov-Gerasimenko through measurement of optically active gas species and imaging of the overall dust coma. We present more than 2 yr of observations performed with the FORS2 low-resolution spectrograph at the VLT, TRAPPIST and ACAM at the WHT. We focus on the evolution of the CN production as a tracer of the comet activity. We find that it is asymmetric with respect to perihelion and different from that of the dust. The CN emission is detected for the first time at 1.34 au pre-perihelion and production rates then increase steeply to peak about 2 weeks after perihelion at (1.00 ± 0.10) × 10[SUP]25[/SUP] molecules s[SUP]-1[/SUP], while the post-perihelion decrease is more shallow. The evolution of the comet activity is strongly influenced by seasonal effects with enhanced CN production when the Southern hemisphere is illuminated.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Opitom, C.;  European Southern Observatory, Avda. Alonso de Cordova 3107 Vitacura, Casilla 19001, Santiago de Chile, Chile
Snodgrass, C. ;  School of Physical Sciences, The Open University, Milton Keynes, MK7 6AA, UK
Fitzsimmons, A.;  Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK
Jehin, Emmanuel  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Manfroid, Jean  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Tozzi, G. P.;  INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50 125 Firenze, Italy
Faggi, S.;  INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50 125 Firenze, Italy
Gillon, Michaël  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Language :
English
Title :
Ground-based monitoring of comet 67P/Churyumov–Gerasimenko gas activity throughout the Rosetta mission
Publication date :
01 July 2017
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
469
Pages :
S222-S229
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 17 August 2017

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