Morphology and dynamics of the jets of comet 67P/Churyumov-Gerasimenko: Early-phase development

Z.-Y. Lin 1 W.-H. Ip 2, 3, 1 I.-L. Lai 3 J.-C. Lee 4 Jean-Baptste Vincent 5 Luisa M. Lara 6 Dennis Bodewits 7 Holger Sierks 5 Cesare Barbieri 8, 9 Philippe L. Lamy 10 Rafael Rodrigo 11, 12 Detlef Koschny 13 Hans Rickman 14 Horst U. Keller 15 Jessica Agarwal 5 Michael F. A’hearn 7 Maria Antonietta Barucci 16 Jean-Loup Bertaux 17 Ivano Bertini 8 Gabriele Cremonese 18 Vania Da Deppo 19 Björn Davidsson 20 Stefano Debei 21 Mariolino De Cecco 22 Sonia Fornasier 23, 16 Marco Fulle 24 Olivier Groussin 10 Pedro J. Gutiérrez 6 Carsten Güttler 5 Stubbe F. Hviid 25 Laurent Jorda 10 Jörg Knollenberg 25 G. Kovacs 5 J.-R. Kramm 5 Michael Küppers 12 Ekkehard Kührt 25 F. La Forgia 9 M. Lazzarin 9 Jose J. López-Moreno 6 Stephen Lowry 26 F. Marzari 9 Harald Michalik 27 S. Mottola 25 Giampiero Naletto 28 Nilda Oklay 5 M. Pajola 8 A. Rozek 26 Nicholas Thomas 29 Y. Liao 29 Cécilia Tubiana 5
Abstract : The OSIRIS camera onboard the Rosetta spacecraft obtained close-up views of the dust coma of comet 67P. The jet structures can be used to trace their source regions and to examine the possible effect of gas-surface interaction. Methods. We analyzed the wide-angle images obtained in the special dust observation sequences between August and September 2014. The jet features detected in different images were compared to study their time variability. The locations of the potential source regions of some of the jets are identified by ray tracing. We used a ring-masking technique to calculate the brightness distribution of dust jets along the projected distance. Results. The jets detected between August and September 2014 mostly originated in the Hapi region. Morphological changes ap- peared over a timescale of several days in September. The brightness slope of the dust jets is much steeper than the background coma. This might be related to the sublimation or fragmentation of the emitted dust grains. Interaction of the expanding gas flow with the cliff walls on both sides of Hapi could lead to erosion and material down-fall to the nucleus surface.
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Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 583, pp.A11. 〈10.1051/0004-6361/201525961〉
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Z.-Y. Lin, W.-H. Ip, I.-L. Lai, J.-C. Lee, Jean-Baptste Vincent, et al.. Morphology and dynamics of the jets of comet 67P/Churyumov-Gerasimenko: Early-phase development. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 583, pp.A11. 〈10.1051/0004-6361/201525961〉. 〈insu-01205741〉



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