Observations and analysis of a curved jet in the coma of comet 67P/Churyumov-Gerasimenko

Z.-Y. Lin 1 I.-L. Lai 2 C.-C. Su 3 W.-H. Ip 4, 2, 1 J.-C. Lee 5 J.-S. Wu 3 Jean-Baptiste Vincent 6 F. La Forgia 7 H. Sierks 6 C. Barbieri 7, 8 R. Rodrigo 9, 10 D. Koschny 11 H. Rickman 12 H. U. Keller 13 J. Agarwal 6 Michael F. A'Hearn 14 M. A. Barucci 15 Jean-Loup Bertaux 16 Ivano Bertini 8 Dennis Bodewits 14 Gabriele Cremonese 17 Vania Da deppo 18 Björn Davidsson 19 Stefano Debei 20 Mariolino de Cecco 21 Sonia Fornasier 15 Marco Fulle 22 Olivier Groussin 23 Pedro J. Gutiérrez 24 Carsten Güttler 6 Stubbe F. Hviid 25 Laurent Jorda 23 Jörg Knollenberg 25 Gabor Kovacs 6 J.-Rainer Kramm 6 Ekkehard Kührt 25 Michael Küppers 26 Luisa-Maria Lara 24 Mario Lazzarin 7 Josè Juan Lopez-Moreno 24 Stephen Lowry 27 Philippe Lamy 23 Francesco Marzari 7 Harald Michalik 14 Stefano Mottola 25 Giampiero Naletto 8, 18, 28 Nilda Oklay 6 Maurizio Pajola 8 A. Rożek 8 Nicholas Thomas 29 Cécilia Tubiana 6
1 IANCU - Institute of Astronomy [Taiwan]
2 Institute of Space Science [Taiwan]
3 Department of Mechanical Engineering [NCTU]
4 SSI - Space Science Institute [Macau]
5 Department of Atmospheric Sciences [Taoyuan City]
6 MPS - Max-Planck-Institut für Sonnensystemforschung
7 Dipartimento di Fisica e Astronomia "Galileo Galilei"
8 CISAS - Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
9 ISSI - International Space Science Institute [Bern]
10 CAB - Centro de Astrobiologia [Madrid]
11 RSSD - Research and Scientific Support Department, ESTEC
12 CBK - Space Research Centre of Polish Academy of Sciences
13 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
14 Department of Astronomy [College Park]
15 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
16 IMPEC - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
17 OAPD - INAF - Osservatorio Astronomico di Padova
18 IFN - CNR Institute for Photonics and Nanotechnologies
19 Department of Physics and Astronomy [Uppsala]
20 Department of Industrial Engineering [Padova]
21 University of Trento [Trento]
22 OAT - INAF - Osservatorio Astronomico di Trieste
23 LAM - Laboratoire d'Astrophysique de Marseille
24 IAA - Instituto de Astrofísica de Andalucía
25 DLR Institute of Planetary Research
26 ESAC - European Space Astronomy Centre
27 CAPS - Centre for Astrophysics and Planetary Science [Canterbury]
28 Department of Information Engineering
29 Physikalisches Institut [Bern]
Abstract : We analyze the physical properties and dynamical origin of a curved jet of comet 67P/Churyumov-Gerasimenko that was observed repeatedly in several nucleus rotations starting on May 30 and persisting until early August, 2015. Methods. We simulated the motion of dust grains ejected from the nucleus surface under the influence of the gravity and viscous drag effect of the expanding gas flow from the rotating nucleus. Results. The formation of the curved jet is a combination of the size of the dust particles (~0.1−1 mm) and the location of the source region near the nucleus equator. This enhances the spiral feature of the collimated dust stream after the dust is accelerated to a terminal speed on the order of m s-1.
Keywords : 67P/Churyumov-Gerasimenko comets
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Z.-Y. Lin, I.-L. Lai, C.-C. Su, W.-H. Ip, J.-C. Lee, et al.. Observations and analysis of a curved jet in the coma of comet 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 588, pp.L3. ⟨10.1051/0004-6361/201527784⟩. ⟨insu-01288643⟩

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