Surface changes on comet 67P/Churyumov-Gerasimenko suggest a more active past.

Autor: El-Maarry MR; Physikalisches Institut, Universität Bern, 3012 Bern, Switzerland. mohamed.el-maarry@lasp.colorado.edu.; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80301, USA., Groussin O; Aix Marseille Université, CNRS, Laboratoire d'Astrophysique de Marseille, UMR 7326, 13388 Marseille, France., Thomas N; Physikalisches Institut, Universität Bern, 3012 Bern, Switzerland., Pajola M; NASA Ames Research Center, Moffett Field, CA 94035, USA., Auger AT; Aix Marseille Université, CNRS, Laboratoire d'Astrophysique de Marseille, UMR 7326, 13388 Marseille, France., Davidsson B; Jet Propulsion Laboratory, Pasadena, CA 91109, USA., Hu X; Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany., Hviid SF; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, 12489 Berlin, Germany., Knollenberg J; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, 12489 Berlin, Germany., Güttler C; Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany., Tubiana C; Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany., Fornasier S; LESIA, Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot, Sorbonne Paris Cité, UPMC Université Paris 06, Sorbonne Universités, Meudon Principal Cedex 92195, France., Feller C; LESIA, Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot, Sorbonne Paris Cité, UPMC Université Paris 06, Sorbonne Universités, Meudon Principal Cedex 92195, France., Hasselmann P; LESIA, Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot, Sorbonne Paris Cité, UPMC Université Paris 06, Sorbonne Universités, Meudon Principal Cedex 92195, France., Vincent JB; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, 12489 Berlin, Germany., Sierks H; Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany., Barbieri C; Department of Physics and Astronomy, University of Padova, 35122 Padova, Italy., Lamy P; Laboratoire d'Astrophysique de Marseille, UMR 7326 CNRS & Université Aix-Marseille, 13388 Marseille Cedex 13, France., Rodrigo R; Centro de Astrobiología, Instituto Nacional de Técnica Aeroespacial, 28850 Torrejón de Ardoz, Madrid, Spain.; International Space Science Institute, 3012 Bern, Switzerland., Koschny D; Operations Department, European Space Astronomy Centre/ESA, P.O. Box 78, 28691 Villanueva de la Cañada, Madrid, Spain., Keller HU; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, 12489 Berlin, Germany.; Institut für Geophysik und Extraterrestrische Physik, Technische Universität Braunschweig, 38106 Braunschweig, Germany., Rickman H; Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden.; Polish Academy of Sciences, Space Research Center, 00716 Warsaw, Poland., A'Hearn MF; Department of Astronomy, University of Maryland, College Park, MD 20742, USA., Barucci MA; LESIA, Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot, Sorbonne Paris Cité, UPMC Université Paris 06, Sorbonne Universités, Meudon Principal Cedex 92195, France., Bertaux JL; Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), CNRS-Université de Versailles Saint-Quentin-en-Yvelines-Institut Pierre Simon Laplace, 78280 Guyancourt, France., Bertini I; Department of Physics and Astronomy, University of Padova, 35122 Padova, Italy., Besse S; Operations Department, European Space Astronomy Centre/ESA, P.O. Box 78, 28691 Villanueva de la Cañada, Madrid, Spain., Bodewits D; Department of Astronomy, University of Maryland, College Park, MD 20742, USA., Cremonese G; Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, 35122 Padova, Italy., Da Deppo V; Consiglio Nazionale delle Ricerche-Istituto di Fotonica e Nanotecnologie, Unità Organizzativa di Supporto, Padova Luxor, 35131 Padova, Italy., Debei S; Department of Industrial Engineering, University of Padova, 35131 Padova, Italy., De Cecco M; University of Trento, 38123 Trento, Italy., Deller J; Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany., Deshapriya JD; LESIA, Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot, Sorbonne Paris Cité, UPMC Université Paris 06, Sorbonne Universités, Meudon Principal Cedex 92195, France., Fulle M; INAF, Osservatorio Astronomico di Trieste, 34014 Trieste, Italy., Gutierrez PJ; Instituto de Astrofísica de Andalucía (CSIC), c/ Glorieta de la Astronomía s/n, 18008 Granada, Spain., Hofmann M; Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany., Ip WH; Graduate Institute of Astronomy, National Central University, Chung-Li 32054, Taiwan., Jorda L; Aix Marseille Université, CNRS, Laboratoire d'Astrophysique de Marseille, UMR 7326, 13388 Marseille, France., Kovacs G; Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany., Kramm JR; Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany., Kührt E; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, 12489 Berlin, Germany., Küppers M; Operations Department, European Space Astronomy Centre/ESA, P.O. Box 78, 28691 Villanueva de la Cañada, Madrid, Spain., Lara LM; Instituto de Astrofísica de Andalucía (CSIC), c/ Glorieta de la Astronomía s/n, 18008 Granada, Spain., Lazzarin M; Department of Physics and Astronomy, University of Padova, 35122 Padova, Italy., Lin ZY; Graduate Institute of Astronomy, National Central University, Chung-Li 32054, Taiwan., Lopez Moreno JJ; Instituto de Astrofísica de Andalucía (CSIC), c/ Glorieta de la Astronomía s/n, 18008 Granada, Spain., Marchi S; Solar System Exploration Research, Virtual Institute, Southwest Research Institute, Boulder, CO 80302, USA., Marzari F; Department of Physics and Astronomy, University of Padova, 35122 Padova, Italy., Mottola S; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, 12489 Berlin, Germany., Naletto G; Consiglio Nazionale delle Ricerche-Istituto di Fotonica e Nanotecnologie, Unità Organizzativa di Supporto, Padova Luxor, 35131 Padova, Italy.; Department of Information Engineering, University of Padova, 35131 Padova, Italy.; Centro di Ateneo di Studi ed Attivitá Spaziali 'Giuseppe Colombo' (CISAS), University of Padova, 35131 Padova, Italy., Oklay N; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, 12489 Berlin, Germany., Pommerol A; Physikalisches Institut, Universität Bern, 3012 Bern, Switzerland., Preusker F; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, 12489 Berlin, Germany., Scholten F; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, 12489 Berlin, Germany., Shi X; Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2017 Mar 31; Vol. 355 (6332), pp. 1392-1395. Date of Electronic Publication: 2017 Mar 21.
DOI: 10.1126/science.aak9384
Abstrakt: The Rosetta spacecraft spent ~2 years orbiting comet 67P/Churyumov-Gerasimenko, most of it at distances that allowed surface characterization and monitoring at submeter scales. From December 2014 to June 2016, numerous localized changes were observed, which we attribute to cometary-specific weathering, erosion, and transient events driven by exposure to sunlight and other processes. While the localized changes suggest compositional or physical heterogeneity, their scale has not resulted in substantial alterations to the comet's landscape. This suggests that most of the major landforms were created early in the comet's current orbital configuration. They may even date from earlier if the comet had a larger volatile inventory, particularly of CO or CO 2 ices, or contained amorphous ice, which could have triggered activity at greater distances from the Sun.
(Copyright © 2017, American Association for the Advancement of Science.)
Databáze: MEDLINE
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