On the nucleus structure and activity of comet 67P/Churyumov-Gerasimenko

Holger Sierks 1 Cesare Barbieri 2 Philippe L. Lamy 3 Rafael Rodrigo 4, 5 Detlef Koschny 6 Hans Rickman 7, 8 Horst Uwe Keller 9, 10 Jessica Agarwal 1 Michael F. A’hearn 1, 11, 12 Francesco Angrilli 13 Anne-Therese Auger 3 M. Antonella Barucci 14 Jean-Loup Bertaux 15 Ivano Bertini 16 Sebastien Besse 17 Dennis Bodewits 11 Claire Capanna 3 Gabriele Cremonese 18 Vania Da Deppo 19 Björn Davidsson 7 Stefano Debei 13 Mariolino De Cecco 20 Francesca Ferri 16 Sonia Fornasier 14 Marco Fulle 21 Robert Gaskell 22 Lorenza Giacomini 16 Olivier Groussin 3 Pablo Gutierrez-Marques 1 Pedro J. Gutiérrez 23 Carsten Güttler 1 Nick Hoekzema 1 Stubbe F. Hviid 10, 1 Wing-Huen Ip 24, 25, 26 Laurent Jorda 3 Jörg Knollenberg 10 Gabor Kovacs 1 J. Rainer Kramm 1 Ekkehard Kührt 10 Michael Küppers 27 Fiorangela La Forgia 2 Luisa M. Lara 23 Monica Lazzarin 2 Cédric Leyrat 14 Josè J. Lopez Moreno 23 Sara Magrin 2 Simone Marchi 28 Francesco Marzari 2 Matteo Massironi 29, 16 Harald Michalik 30 Richard Moissl 27 Stefano Mottola 10 Giampiero Naletto 31, 16, 19 Nilda Oklay 1 Maurizio Pajola 16 Marco Pertile 13, 16 Frank Preusker 10 Lola Sabau 32 Frank Scholten 10 Colin Snodgrass 1 Nicolas Thomas 33, 34 Cecilia Tubiana 1 Jean-Baptiste Vincent 1 Klaus-Peter Wenzel 6 Mirco Zaccariotto 13, 16 Martin Pätzold 35
15 IMPEC - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : mages from the OSIRIS scientific imaging system onboard Rosetta show that the nucleus of 67P/Churyumov-Gerasimenko consists of two lobes connected by a short neck. The nucleus has a bulk density less than half that of water. Activity at a distance from the Sun of >3 astronomical units is predominantly from the neck, where jets have been seen consistently. The nucleus rotates about the principal axis of momentum. The surface morphology suggests that the removal of larger volumes of material, possibly via explosive release of subsurface pressure or via creation of overhangs by sublimation, may be a major mass loss process. The shape raises the question of whether the two lobes represent a contact binary formed 4.5 billion years ago, or a single body where a gap has evolved via mass loss.
Type de document :
Article dans une revue
Science, American Association for the Advancement of Science, 2015, 347 (6220), aaa1044 (5 p.). 〈10.1126/science.aaa1044〉
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https://hal.archives-ouvertes.fr/hal-01110122
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Soumis le : mardi 27 janvier 2015 - 15:31:07
Dernière modification le : mardi 27 juin 2017 - 18:22:48

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Holger Sierks, Cesare Barbieri, Philippe L. Lamy, Rafael Rodrigo, Detlef Koschny, et al.. On the nucleus structure and activity of comet 67P/Churyumov-Gerasimenko. Science, American Association for the Advancement of Science, 2015, 347 (6220), aaa1044 (5 p.). 〈10.1126/science.aaa1044〉. 〈hal-01110122〉

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