Reference : The dust environment of comet 67P/Churyumov-Gerasimenko from Rosetta OSIRIS and VLT o...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/201656
The dust environment of comet 67P/Churyumov-Gerasimenko from Rosetta OSIRIS and VLT observations in the 4.5 to 2.9 AU heliocentric distance range inbound
English
Moreno, F. [Instituto de Astrofísica de Andalucía, , CSIC, Glorieta de la Astronomía s/n, 18008, Granada, Spain]
Snodgrass, C. [Planetary and Space Sciences, Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes, Buckinghamshire, MK7 6AA, UK]
Hainaut, O. [European Southern Observatory, Karl-Schwarschild-Strasse 2, 85748, Garching bei München, Germany]
Tubiana, C. [Max-Planck Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, Germany]
Sierks, H. [Max-Planck Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, Germany]
Barbieri, C. [Department of Physics and Astronomy G. Galilei, University of Padova, Vic. Osservatorio 3, 35122, Padova, Italy; Center of Studies and Activities for Space (CISAS) G. Colombo, University of Padova, via Venezia 15, 35131, Padova, Italy]
Lamy, P. L. [Aix Marseille Université, CNRS, LAM (Laboratoire dAstro-physique de Marseille) UMR 7326, 13388, Marseille, France]
Rodrigo, R. [Centro de Astrobiologia (INTA-CSIC), European Space Agency (ESA), European Space Astronomy Centre (ESAC), PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain; International Space Science Institute, Hallerstrasse 6, 3012, Bern, Switzerland]
Koschny, D. [Research and Scientific Support Department, European Space Agency, 2201, Noordwijk, The Netherlands]
Rickman, H. [PAS Space Research Center, Bartycka 18A, 00716, Warszawa, Poland; Department of Physics and Astronomy, Uppsala University, Box 516, 75120, Uppsala, Sweden]
Keller, H. U. [Institute for Geophysics and Extraterrestrial Physics, TU Braunschweig, 38106, Braunschweig, Germany]
Agarwal, J. [Max-Planck Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, Germany]
A'Hearn, M. F. [Department for Astronomy, University of Maryland, College Park, MD, 20742-2421, USA]
Barucci, M. A. [LESIA, Observatoire de Paris, CNRS, UPMC, Univ. Paris-Diderot, 5 place J. Janssen, 92195, Meudon Principal Cedex, France]
Bertaux, J.-L. [LATMOS, CNRS/UVSQ/IPSL, 11 Bd d'Alembert, 78280, Guyancourt, France]
Bertini, I. [Center of Studies and Activities for Space (CISAS) G. Colombo, University of Padova, via Venezia 15, 35131, Padova, Italy]
Besse, S. [Research and Scientific Support Department, European Space Agency, 2201, Noordwijk, The Netherlands]
Bodewits, D. [Department for Astronomy, University of Maryland, College Park, MD, 20742-2421, USA]
Cremonese, G. [INAF Osservatorio Astronomico di Padova, vic. dell'Osservatorio 5, 35122, Padova, Italy]
Da Deppo, V. [CNR-IFN UOS Padova LUXOR, via Trasea 7, 35131, Padova, Italy]
Davidsson, B. [Department of Physics and Astronomy, Uppsala University, Box 516, 75120, Uppsala, Sweden]
Debei, S. [Department of Industrial Engineering, University of Padova, via Venezia 1, 35131, Padova, Italy]
De Cecco, M. [University of Trento, via Sommarive 9, 38123, Trento, Italy]
Ferri, F. [Center of Studies and Activities for Space (CISAS) G. Colombo, University of Padova, via Venezia 15, 35131, Padova, Italy]
Fornasier, S. [LESIA, Observatoire de Paris, CNRS, UPMC, Univ. Paris-Diderot, 5 place J. Janssen, 92195, Meudon Principal Cedex, France]
Fulle, M. [INAF-Osservatorio Astronomico di Trieste, via Tiepolo 11, 34143, Trieste, Italy]
Groussin, O. [Aix Marseille Université, CNRS, LAM (Laboratoire dAstro-physique de Marseille) UMR 7326, 13388, Marseille, France]
Gutiérrez, P. J. [Instituto de Astrofísica de Andalucía, , CSIC, Glorieta de la Astronomía s/n, 18008, Granada, Spain]
Gutiérrez-Marques, P. [Max-Planck Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, Germany]
Güttler, C. [Max-Planck Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, Germany]
Hviid, S. F. [Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, Rutherfordstrasse 2, 12489, Berlin, Germany]
Ip, W.-H. [Institute for Space Science, National Central University, 32054, Chung-Li, Taiwan]
Jorda, L. [Aix Marseille Université, CNRS, LAM (Laboratoire dAstro-physique de Marseille) UMR 7326, 13388, Marseille, France]
Knollenberg, J. [Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, Rutherfordstrasse 2, 12489, Berlin, Germany]
Kovacs, G. [Max-Planck Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, Germany]
Kramm, J.-R. [Max-Planck Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, Germany]
Kührt, E. [Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, Rutherfordstrasse 2, 12489, Berlin, Germany]
Küppers, M. [ESA/ESAC, PO Box 78, 28691, Villanueva de la Cañada, Spain]
Lara, L. M. [Instituto de Astrofísica de Andalucía, , CSIC, Glorieta de la Astronomía s/n, 18008, Granada, Spain]
Lazzarin, M. [Department of Physics and Astronomy G. Galilei, University of Padova, Vic. Osservatorio 3, 35122, Padova, Italy]
López-Moreno, J. J. [Instituto de Astrofísica de Andalucía, , CSIC, Glorieta de la Astronomía s/n, 18008, Granada, Spain]
Marzari, F. [Department of Physics and Astronomy G. Galilei, University of Padova, Vic. Osservatorio 3, 35122, Padova, Italy]
Mottola, S. [Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Planetenforschung, Rutherfordstrasse 2, 12489, Berlin, Germany]
Naletto, G. [Center of Studies and Activities for Space (CISAS) G. Colombo, University of Padova, via Venezia 15, 35131, Padova, Italy; CNR-IFN UOS Padova LUXOR, via Trasea 7, 35131, Padova, Italy; Department of Information Engineering, University of Padova, via Gradenigo 6/B, 35131, Padova, Italy]
Oklay, N. [Max-Planck Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, Germany]
Pajola, M. [Center of Studies and Activities for Space (CISAS) G. Colombo, University of Padova, via Venezia 15, 35131, Padova, Italy]
Thomas, N. [Physikalisches Institut, Sidlerstrasse 5, University of Bern, 3012, Bern, Switzerland]
Vincent, J. B. [Max-Planck Institut für Sonnensystemforschung, Justus-von-Liebig-Weg, 3, 37077, Göttingen, Germany]
Della Corte, V. [Institute for Space Astrophysics and Planetology (IAPS), National Institute for AstroPhysics (INAF), via Fosso del Cavaliere 100, 00133, Roma, Italy]
Fitzsimmons, A. [Astrophysics Research Centre, School of Physics and Astronomy, Queen's University Belfast, Belfast, BT7 1NN, UK]
Faggi, S. [INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50 125, Firenze, Italy]
Jehin, Emmanuel mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Opitom, Cyrielle mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Tozzi, G.-P. [INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50 125, Firenze, Italy)]
1-Mar-2016
Astronomy and Astrophysics
EDP Sciences
587
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] comets: individual: 67P/Churyumov-Gerasimenko ; methods: data analysis ; techniques: photometric
[en] Context. The ESA Rosetta spacecraft, currently orbiting around comet 67P/Churyumov-Gerasimenko, has already provided in situ measurements of the dust grain properties from several instruments,particularly OSIRIS and GIADA. We propose adding value to those measurements by combining them with ground-based observations of the dust tail to monitor the overall, time-dependent dust-production rate and size distribution. <BR /> Aims: To constrain the dust grain properties, we take Rosetta OSIRIS and GIADA results into account, and combine OSIRIS data during the approach phase (from late April to early June 2014) with a large data set of ground-based images that were acquired with the ESO Very Large Telescope (VLT) from February to November 2014. <BR /> Methods: A Monte Carlo dust tail code, which has already been used to characterise the dust environments of several comets and active asteroids, has been applied to retrieve the dust parameters. Key properties of the grains (density, velocity, and size distribution) were obtained from Rosetta observations: these parameters were used as input of the code to considerably reduce the number of free parameters. In this way, the overall dust mass-loss rate and its dependence on the heliocentric distance could be obtained accurately. <BR /> Results: The dust parameters derived from the inner coma measurements by OSIRIS and GIADA and from distant imaging using VLT data are consistent, except for the power index of the size-distribution function, which is α = -3, instead of α = -2, for grains smaller than 1 mm. This is possibly linked to the presence of fluffy aggregates in the coma. The onset of cometary activity occurs at approximately 4.3 AU, with a dust production rate of 0.5 kg/s, increasing up to 15 kg/s at 2.9 AU. This implies a dust-to-gas mass ratio varying between 3.8 and 6.5 for the best-fit model when combined with water-production rates from the MIRO experiment.
Professionals
http://hdl.handle.net/2268/201656
10.1051/0004-6361/201527564
http://adsabs.harvard.edu/abs/2016A%26A...587A.155M

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