Reference : Ground-based monitoring of comet 67P/Churyumov–Gerasimenko gas activity throughout th...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/213610
Ground-based monitoring of comet 67P/Churyumov–Gerasimenko gas activity throughout the Rosetta mission
English
Opitom, C. mailto [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 <ID system="ORCID">0000-0001-9328-2905</ID>]
Fitzsimmons, A. [Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK]
Jehin, Emmanuel mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Manfroid, Jean mailto [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 mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
1-Jul-2017
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
469
S222-S229
Yes (verified by ORBi)
International
0035-8711
1365-2966
Oxford
United Kingdom
[en] comets: individual: 67P/Churyumov-Gerasimenko
[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.
http://hdl.handle.net/2268/213610
10.1093/mnras/stx1591
http://adsabs.harvard.edu/abs/2017MNRAS.469S.222O

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