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http://hdl.handle.net/20.500.12386/23146
Titolo: | Two independent and primitive envelopes of the bilobate nucleus of comet 67P | Autori: | MASSIRONI, MATTEO SIMIONI, EMANUELE MARZARI, FRANCESCO CREMONESE, Gabriele GIACOMINI, LORENZA PAJOLA, MAURIZIO Jorda, Laurent Naletto, Giampiero Lowry, Stephen El-Maarry, Mohamed Ramy Preusker, Frank Scholten, Frank Sierks, Holger Barbieri, Cesare Lamy, Philippe Rodrigo, Rafael Koschny, Detlef Rickman, Hans Keller, Horst Uwe A'Hearn, Michael F. Agarwal, Jessica Auger, Anne-Thérèse Barucci, M. Antonella Bertaux, Jean-Loup BERTINI, IVANO Besse, Sebastien Bodewits, Dennis Capanna, Claire Da Deppo, Vania Davidsson, Björn Debei, Stefano de Cecco, Mariolino Ferri, Francesca FORNASIER, SONIA FULLE, Marco Gaskell, Robert Groussin, Olivier Gutiérrez, Pedro J. Güttler, Carsten Hviid, Stubbe F. Ip, Wing-Huen Knollenberg, Jörg Kovacs, Gabor Kramm, Rainer Kührt, Ekkehard Küppers, Michael La Forgia, Fiorangela Lara, Luisa M. Lazzarin, Monica Lin, Zhong-Yi Lopez Moreno, Josè J. Magrin, Sara Michalik, Harald Mottola, Stefano Oklay, Nilda Pommerol, Antoine Thomas, Nicolas TUBIANA, Cecilia Vincent, Jean-Baptiste |
Data pubblicazione: | 2015 | Rivista: | NATURE | Numero: | 526 | Fascicolo: | 7573 | Da pagina:: | 402 | Abstract: | The factors shaping cometary nuclei are still largely unknown, but could be the result of concurrent effects of evolutionary and primordial processes. The peculiar bilobed shape of comet 67P/Churyumov-Gerasimenko may be the result of the fusion of two objects that were once separate or the result of a localized excavation by outgassing at the interface between the two lobes. Here we report that the comet's major lobe is enveloped by a nearly continuous set of strata, up to 650 metres thick, which are independent of an analogous stratified envelope on the minor lobe. Gravity vectors computed for the two lobes separately are closer to perpendicular to the strata than those calculated for the entire nucleus and adjacent to the neck separating the two lobes. Therefore comet 67P/Churyumov-Gerasimenko is an accreted body of two distinct objects with `onion-like' stratification, which formed before they merged. We conclude that gentle, low-velocity collisions occurred between two fully formed kilometre-sized cometesimals in the early stages of the Solar System. The notable structural similarities between the two lobes of comet 67P/Churyumov-Gerasimenko indicate that the early-forming cometesimals experienced similar primordial stratified accretion, even though they formed independently. <P /> | Acknowledgments: | OSIRIS was built by a consortium of the Max-Planck-Institut für Sonnensystemforschung (in Göttingen, Germany), CISAS-University of Padova (Italy), the Laboratoire d’Astrophysique de Marseille (France), the Instituto de Astrofísica de Andalucia, CSIC (Granada, Spain), the Research and Scientific Support Department of the European Space Agency (Noordwijk, The Netherlands), the Instituto Nacional de Técnica Aeroespacial (Madrid, Spain), the Universidad Politćhnica de Madrid (Spain), the Department of Physics and Astronomy of Uppsala University (Sweden), and the Institut für Datentechnik und Kommunikationsnetze der Technischen Universität Braunschweig (Germany). The support of the national funding agencies of Germany (DLR), France (CNES), Italy (ASI), Spain (MEC), Sweden (SNSB), and the ESA Technical Directorate is gratefully acknowledged. We thank the ESA teams at ESAC, ESOC and ESTEC for their work in support of the Rosetta mission. | URI: | http://hdl.handle.net/20.500.12386/23146 | URL: | https://www.nature.com/articles/nature15511 | ISSN: | 0028-0836 | DOI: | 10.1038/nature15511 | Bibcode ADS: | 2015Natur.526..402M | Fulltext: | reserved |
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