Dust measurements in the coma of comet 67P/Churyumov-Gerasimenko inbound to the Sun

Alessandra Rotundi 1, 2 Holger Sierks 3 Vincenzo Della Corte 1 Marco Fulle 4 Pedro J. Gutierrez 5 Luisa Lara 5 Cesare Barbieri 6 Philippe L. Lamy 7 Rafael Rodrigo 8, 9 Detlef Koschny 10 Hans Rickman 11, 12 Horst Uwe Keller 13 José J. López-Moreno 5 Mario Accolla 14 Jessica Agarwal 3 Michael F. A’hearn 3, 15, 16 Nicolas Altobelli 17 Francesco Angrilli 18 M. Antonietta Barucci 19 Jean-Loup Bertaux 20 Ivano Bertini 21 Dennis Bodewits 15 Ezio Bussoletti 14 Luigi Colangeli 22 Massimo Cosi Gabriele Cremonese 23 Jean-François Crifo 24 Vania Da Deppo 25 Björn Davidsson 11 Stefano Debei 18 Mariolino De Cecco 26 Francesca Esposito 27 Marco Ferrari 7 Sonia Fornasier 19 Frank Giovane 28 Bo Gustafson 29 Simon F. Green 30 Olivier Groussin 7 Eberhard Grün 31 Carsten Güttler 3 Miguel L. Herranz 5 Stubbe F. Hviid 32, 3 Wing Ip 33, 34, 35 Stavro Ivanovski 27 José M. Jerónimo 5 Laurent Jorda 7 Joerg Knollenberg 32 Rainer Kramm 3 Ekkehard Kührt 32 Michael Küppers 17 Monica Lazzarin 6 Mark R. Leese 30 Antonio C. López-Jiménez 5 Francesca Lucarelli 2 Stephen C. Lowry 36 Francesco Marzari 6 Elena Mazzotta Epifani 27 J. Anthony M. Mcdonnell 37, 30 Vito Mennella 27 Harald Michalik 38 Antonio Molina 39 Rafael Morales 5 Fernando Moreno 5 Stefano Mottola 32 Giampiero Naletto 40, 21, 25 Nilda Oklay 3 José L. Ortiz 41 Ernesto Palomba 1 Pasquale Palumbo 14 Jean-Marie Perrin 42 Julio Rodríguez 5 Lola Sabau 43 Colin Snodgrass 3 Roberto Sordini 14 Nicolas Thomas 44, 45 Cecilia Tubiana 3 Jean-Baptiste Vincent 3 Paul Weissman 46 Klaus-Peter Wenzel 10 Vladimir Zakharov 19 John C. Zarnecki 4
20 IMPEC - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
24 HEPPI - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Critical measurements for understanding accretion and the dust/gas ratio in the solar nebula, where planets were forming 4.5 billion years ago, are being obtained by the GIADA (Grain Impact Analyser and Dust Accumulator) experiment on the European Space Agency’s Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 and 3.4 astronomical units inbound, GIADA and OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) detected 35 outflowing grains of mass 10−10 to 10−7 kilograms, and 48 grains of mass 10−5 to 10−2 kilograms, respectively. Combined with gas data from the MIRO (Microwave Instrument for the Rosetta Orbiter) and ROSINA (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) instruments, we find a dust/gas mass ratio of 4 ± 2 averaged over the sunlit nucleus surface. A cloud of larger grains also encircles the nucleus in bound orbits from the previous perihelion. The largest orbiting clumps are meter-sized, confirming the dust/gas ratio of 3 inferred at perihelion from models of dust comae and trails.
Type de document :
Article dans une revue
Science, American Association for the Advancement of Science, 2015, 347 (6220), aaa3905 (6 p.). 〈10.1126/science.aaa3905〉
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Contributeur : Catherine Cardon <>
Soumis le : mardi 27 janvier 2015 - 18:33:23
Dernière modification le : jeudi 9 novembre 2017 - 09:36:02

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Alessandra Rotundi, Holger Sierks, Vincenzo Della Corte, Marco Fulle, Pedro J. Gutierrez, et al.. Dust measurements in the coma of comet 67P/Churyumov-Gerasimenko inbound to the Sun. Science, American Association for the Advancement of Science, 2015, 347 (6220), aaa3905 (6 p.). 〈10.1126/science.aaa3905〉. 〈hal-01110291〉

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