Evolution of the Dust Size Distribution of Comet 67P/Churyumov–Gerasimenko from 2.2 au to Perihelion - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astrophysical Journal Year : 2016

Evolution of the Dust Size Distribution of Comet 67P/Churyumov–Gerasimenko from 2.2 au to Perihelion

Marco Fulle (1) , Francesco Marzari (2) , V. Della Corte (3) , Sonia Fornasier (4) , H. Sierks (5) , A. Rotundi (3, 6) , C. Barbieri (2) , Philippe L. Lamy (7) , R. Rodrigo (8, 9) , D. Koschny (10) , H. Rickman (11, 12) , H. U. Keller (13) , J. J. López-Moreno (14) , Mario Accolla (15) , J. Agarwal (5) , Michael F. A'Hearn (16) , N. Altobelli (17) , M. Antonella Barucci (4) , Jean-Loup Bertaux (18) , I. Bertini (19) , Dennis Bodewits (16) , E. Bussoletti (6) , L. Colangeli (20) , M. Cosi (21) , Gabriele Cremonese (22) , Jean-François Crifo (23) , V. da Deppo (24) , B. Davidsson (12) , S. Debei (25) , M. de Cecco (26) , F. Esposito (27) , M. Ferrari (3) , F. Giovane (28) , B. Gustafson (29) , S. F. Green (30) , Olivier Groussin (7) , E. Grün (31) , P. Gutierrez (14) , C. Güttler (5) , M. L. Herranz (15) , S. F. Hviid (32) , W. Ip (33) , S. L. Ivanovski (3) , J. M. Jerónimo (14) , Laurent Jorda (7) , J. Knollenberg (32) , R. Kramm (5) , Ekkehard Kührt (32) , M. Küppers (34) , L. Lara (14) , M. Lazzarin (2) , M. R. Leese (30) , A. C. López-Jiménez (14) , F. Lucarelli (6) , E. Mazzotta Epifani (35) , J. A. M. Mcdonnell (30, 36) , V. Mennella (27) , A. Molina (37) , R. Morales (14) , F. Moreno (14) , S. Mottola (32) , G. Naletto (38, 19, 25) , N. Oklay (5) , J. L. Ortiz (14) , E. Palomba (3) , P. Palumbo (3, 6) , J.-M. Perrin (39) , F. J. M. Rietmeijer (40) , J. Rodríguez (14) , R. Sordini (3) , N. Thomas (41) , C. Tubiana (5) , J.-B. Vincent (5) , P. Weissman (42) , K.-P. Wenzel (10) , V. Zakharov (4) , J. C. Zarnecki (8, 30)
1 OAT - INAF - Osservatorio Astronomico di Trieste
2 Dipartimento di Fisica e Astronomia "Galileo Galilei"
3 IAPS - Istituto di Astrofisica e Planetologia Spaziali - INAF
4 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
5 MPS - Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
6 PARTHENOPE - Università degli Studi di Napoli “Parthenope” = University of Naples
7 LAM - Laboratoire d'Astrophysique de Marseille
8 ISSI - International Space Science Institute [Bern]
9 CAB - Centro de Astrobiologia [Madrid]
10 RSSD - Research and Scientific Support Department, ESTEC
11 CBK - Space Research Centre of Polish Academy of Sciences
12 Department of Physics and Astronomy [Uppsala]
13 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
14 IAA - Instituto de Astrofísica de Andalucía
15 OACT - INAF - Osservatorio Astrofisico di Catania
16 Department of Astronomy [College Park]
17 ESAC - European Space Astronomy Centre
18 PLANETO - LATMOS
19 CISAS - Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
20 ESTEC - European Space Research and Technology Centre
21 Selex-ES
22 OAPD - INAF - Osservatorio Astronomico di Padova
23 HELIOS - LATMOS
24 IFN - CNR Institute for Photonics and Nanotechnologies
25 Department of Industrial Engineering [Padova]
26 UNITN - Università degli Studi di Trento = University of Trento
27 OAC - INAF - Osservatorio Astronomico di Capodimonte
28 Virginia Polytechnic Institute and State University [Blacksburg]
29 UF - University of Florida [Gainesville]
30 School of Physical Sciences [Milton Keynes]
31 MPIK - Max-Planck-Institut für Kernphysik
32 DLR Institute of Planetary Research
33 Institute of Space Science [Taiwan]
34 Operations Department (ESAC)
35 OAR - INAF - Osservatorio Astronomico di Roma
36 University of Kent [Canterbury]
37 Departamento de Fisica Aplicada [Granada]
38 DEI - Department of Information Engineering [Padova]
39 OHP - Observatoire de Haute-Provence
40 EPS - Department of Earth and Planetary Sciences [Albuquerque]
41 Physikalisches Institut [Bern]
42 PSI - Planetary Science Institute [Tucson]
Marco Fulle
  • Function : Author
  • PersonId : 980748
Jean-Loup Bertaux
  • Function : Author
  • PersonId : 914210
M. Cosi
  • Function : Author
Jean-François Crifo
  • Function : Author
  • PersonId : 980749
Laurent Jorda
R. Morales
  • Function : Author
  • PersonId : 834691

Abstract

The Rosetta probe, orbiting Jupiter-family comet 67P/Churyumov–Gerasimenko, has been detecting individual dust particles of mass larger than 10−10 kg by means of the GIADA dust collector and the OSIRIS Wide Angle Camera and Narrow Angle Camera since 2014 August and will continue until 2016 September. Detections of single dust particles allow us to estimate the anisotropic dust flux from 67P, infer the dust loss rate and size distribution at the surface of the sunlit nucleus, and see whether the dust size distribution of 67P evolves in time. The velocity of the Rosetta orbiter, relative to 67P, is much lower than the dust velocity measured by GIADA, thus dust counts when GIADA is nadir-pointing will directly provide the dust flux. In OSIRIS observations, the dust flux is derived from the measurement of the dust space density close to the spacecraft. Under the assumption of radial expansion of the dust, observations in the nadir direction provide the distance of the particles by measuring their trail length, with a parallax baseline determined by the motion of the spacecraft. The dust size distribution at sizes >1 mm observed by OSIRIS is consistent with a differential power index of −4, which was derived from models of 67P's trail. At sizes <1 mm, the size distribution observed by GIADA shows a strong time evolution, with a differential power index drifting from −2 beyond 2 au to −3.7 at perihelion, in agreement with the evolution derived from coma and tail models based on ground-based data. The refractory-to-water mass ratio of the nucleus is close to six during the entire inbound orbit and at perihelion.
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Dates and versions

insu-01300203 , version 1 (27-11-2020)

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Cite

Marco Fulle, Francesco Marzari, V. Della Corte, Sonia Fornasier, H. Sierks, et al.. Evolution of the Dust Size Distribution of Comet 67P/Churyumov–Gerasimenko from 2.2 au to Perihelion. The Astrophysical Journal, 2016, 821 (1), 14 p. ⟨10.3847/0004-637X/821/1/19⟩. ⟨insu-01300203⟩
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