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Multivariate statistical analysis of OSIRIS/Rosetta spectrophotometric data of comet 67P/Churyumov-Gerasimenko

Perna, D. (author)
UPMC Univ Paris 06, Observ Paris, CNRS, LESIA,Sorbonne Paris Cite, 5 Pl Jules Janssen, F-921959 Meudon, France.
Fulchignoni, M. (author)
UPMC Univ Paris 06, Observ Paris, CNRS, LESIA,Sorbonne Paris Cite, 5 Pl Jules Janssen, F-921959 Meudon, France.
Barucci, M. A. (author)
UPMC Univ Paris 06, Observ Paris, CNRS, LESIA,Sorbonne Paris Cite, 5 Pl Jules Janssen, F-921959 Meudon, France.
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Fornasier, S. (author)
UPMC Univ Paris 06, Observ Paris, CNRS, LESIA,Sorbonne Paris Cite, 5 Pl Jules Janssen, F-921959 Meudon, France.
Feller, C. (author)
UPMC Univ Paris 06, Observ Paris, CNRS, LESIA,Sorbonne Paris Cite, 5 Pl Jules Janssen, F-921959 Meudon, France.
Deshapriya, J. D. P. (author)
UPMC Univ Paris 06, Observ Paris, CNRS, LESIA,Sorbonne Paris Cite, 5 Pl Jules Janssen, F-921959 Meudon, France.
Hasselmann, P. H. (author)
UPMC Univ Paris 06, Observ Paris, CNRS, LESIA,Sorbonne Paris Cite, 5 Pl Jules Janssen, F-921959 Meudon, France.
Sierks, H. (author)
Max Planck Inst Stromungsforsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Barbieri, C. (author)
Univ Padua, Dept Phys & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy.
Lamy, P. L. (author)
Univ Aix Marseille, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France.;CNRS, Lab Astrophys Marseille, UMR 7326, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France.
Rodrigo, R. (author)
Ctr Astrobiol INTACSIC, Madrid 28850, Spain.;Int Space Sci Inst, Hallerstr 6, CH-3012 Bern, Switzerland.
Koschny, D. (author)
European Space Technol Ctr, ESA, Sci Support Off, Keplerlaan 1,Postbus 299, NL-2201 AZ Noordwijk, ZH, Netherlands.
Rickman, Hans (author)
Uppsala universitet,Observationell astrofysik,PAS Space Res Ctr, Bartycka 18A, PL-00716 Warsaw, Poland.
A'Hearn, M. (author)
Univ Maryland, Dept Astron, College Pk, MD 20742 USA.
Bertaux, J. -L (author)
Bertini, I. (author)
Univ Padua, Dept Phys & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy.
Cremonese, G. (author)
Osserv Astron Padova, INAF, Vicolo Osservatorio 5, I-35122 Padua, Italy.
Da Deppo, V. (author)
CNR, IFN UOS Padova LUXOR, Via Trasea 7, I-35131 Padua, Italy.
Davidsson, B. (author)
Jet Prop Lab, M-S 183-301,4800 Oak Grove Dr, Pasadena, CA 91109 USA.
Debei, S. (author)
Univ Padua, Dept Mech Engn, Via Venezia 1, I-35131 Padua, Italy.
Deller, J. (author)
Max Planck Inst Stromungsforsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
De Cecco, M. (author)
Univ Trent, Via Mesiano 77, I-38100 Trento, Italy.
El-Maarry, M. R. (author)
Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.
Fulle, M. (author)
Osserv Astron Trieste, INAF, Via Tiepolo 11, I-34014 Trieste, Italy.
Groussin, O. (author)
Aix Marseille Univ, CNRS, LAM, UMR 7326, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France.
Gutierrez, P. J. (author)
CSIC, Inst Astrofis Andalucia, C Glorieta Astron S-N, E-18008 Granada, Spain.
Guttler, C. (author)
Max Planck Inst Stromungsforsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Hofmann, M. (author)
Max Planck Inst Stromungsforsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Hviid, S. F. (author)
Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch Asteroiden & Kometen, Rutherfordstrafle 2, D-12489 Berlin, Germany.
Ip, W. -H (author)
Jorda, L. (author)
Aix Marseille Univ, CNRS, LAM, UMR 7326, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France.
Keller, H. U. (author)
Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch Asteroiden & Kometen, Rutherfordstrafle 2, D-12489 Berlin, Germany.;Tech Univ Carolo Wilhelmina Braunschweig, IGEP, Mendelssohnstr 3, D-38106 Braunschweig, Germany.
Knollenberg, J. (author)
Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch Asteroiden & Kometen, Rutherfordstrafle 2, D-12489 Berlin, Germany.
Kramm, R. (author)
Max Planck Inst Stromungsforsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Kuhrt, E. (author)
Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch Asteroiden & Kometen, Rutherfordstrafle 2, D-12489 Berlin, Germany.
Kuppers, M. (author)
ESA, European Space Astron Centre, Operat Dept, POB 78, Madrid 28691, Spain.
Lara, L. M. (author)
CSIC, Inst Astrofis Andalucia, C Glorieta Astron S-N, E-18008 Granada, Spain.
Lazzarin, M. (author)
Univ Padua, Dept Phys & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy.
Moreno, J. J. Lopez (author)
CSIC, Inst Astrofis Andalucia, C Glorieta Astron S-N, E-18008 Granada, Spain.
Marzari, F. (author)
Univ Padua, Dept Phys & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy.
Naletto, G. (author)
CNR, IFN UOS Padova LUXOR, Via Trasea 7, I-35131 Padua, Italy.;Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.;Univ Padua, Dept Informat Engn, Via Gradenigo 6-B, I-35131 Padua, Italy.;Univ Padua, Ctr Studies & Activ Space CISAS G Colombo, Via Venezia 15, I-35131 Padua, Italy.
Oklay, N. (author)
Max Planck Inst Stromungsforsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Thomas, N. (author)
Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.
Tubiana, C. (author)
Max Planck Inst Stromungsforsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
Vincent, J. -B (author)
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UPMC Univ Paris 06, Observ Paris, CNRS, LESIA,Sorbonne Paris Cite, 5 Pl Jules Janssen, F-921959 Meudon, France Max Planck Inst Stromungsforsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (creator_code:org_t)
2017-04-12
2017
English.
In: Astronomy and Astrophysics. - : EDP SCIENCES S A. - 0004-6361 .- 1432-0746. ; 600
Related links:
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Context. The ESA Rosetta mission explored comet 67P/Churyumov-Gerasimenko in 2014 2016, following its target before and after the perihelion passage on 13 August 2015. The NAC camera of the OSIRIS imaging system allowed to map the nucleus surface acquiring images with different filters in the visible wavelength range.Aims. Here we study the spectrophotometric behaviour of the nucleus by a multivariate statistical analysis, aiming to distinguish homogeneous groups and to constrain the bulk composition.Methods. We applied the G-mode clustering algorithm to 16 OSIRIS data cubes acquired on 5 6 August 2014 (mostly covering the northern hemisphere) and 2 May 2015 (mostly covering the southern hemisphere), selected to have complete coverage of the comet's surface with similar observing conditions.Results. We found four similar homogeneous groups for each of the analysed cubes. The first group corresponds to the average spectrophotometric behaviour of the nucleus. The second (spectrally redder) and the third (spectrally bluer) groups are found in regions that were already found to deviate from the average terrain of the comet by previous studies. A fourth group (characterised by enhancements of the flux at 700 750 nm and 989 nm, possibly due to H2O+ and /or NH2 emissions) seems connected with the cometary activity rather than with the bulk composition.Conclusions. While our aim in this work was to study the spectrophotometric behaviour of the nucleus of 67P/Churyumov-Gerasimenko as a whole, we found that a follow-up application of the G-mode to smaller regions of the surface could be useful in particular to identify and study the temporal evolution of ice patches, as well as to constrain the composition and physical processes behind the emission of dust jets.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

comets: individual: 67P/Churyumov-Gerasimenko
methods: data analysis
techniques: photometric

Publication and Content Type

ref (subject category)
art (subject category)

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