Summer fireworks on comet 67P

Jean-Baptiste Vincent 1 Michael F. A'Hearn 2 Zhong-Yi Lin 3 Mohamed R. El-Maarry 4 Maurizio Pajola 5, 6 Holger Sierks 1 Cesare Barbieri 7 Philippe L. Lamy 8 R. Rodrigo 9, 10 Detlef Koschny 11 Hans Rickman 12, 13 Horst U. Keller 14 Jessica Agarwal 1 Maria A. Barucci 15 Jean-Loup Bertaux 16 Ivano Bertini 6 S. Besse 17 D. Bodewits 2 Gabriele Cremonese 18 Vania Da deppo 19 Björn Davidsson 20 S. Debei 21 Mariolino De cecco 22 J. Deller 1 Sonia Fornasier 15 Marco Fulle 23 Adeline Gicquel 1 Olivier Groussin 8 P. J. Gutiérrez 24 P. Gutiérrez-Marquez 1 C. Güttler 1 Sebastian Höfner 1, 14 M. Hofmann 1 Stubbe F. Hviid 25 W.-H. Ip 26, 3 L. Jorda 8 Jörg Knollenberg 25 G. Kovacs 27, 1 J.-R. Kramm 1 Ekkehard Kührt 25 Michael Küppers 28 L. M. Lara 24 Monica Lazzarin 7 J. J. Lopez moreno 24 F. Marzari 7 Matteo Massironi 29 S. Mottola 25 Giampiero Naletto 6, 19, 27 Nilda Oklay 1 F. Preusker 25 F. Scholten 25 X. Shi 1 Nicholas Thomas 4 Imre Toth 30, 8 Cecilia Tubiana 1
Abstract : During its two years mission around comet 67P/Churyumov-Gerasimenko, ESA's Rosetta spacecraft had the unique opportunity to follow closely a comet in the most active part of its orbit. Many studies have presented the typical features associated to the activity of the nucleus, such as localized dust and gas jets. Here we report on series of more energetic transient events observed during the three months surrounding the comet's perihelion passage in August 2015. We detected and characterized 34 outbursts with the Rosetta cameras, one every 2.4 nucleus rotation. We identified 3 main dust plume morphologies associated to these events: a narrow jet, a broad fan, and more complex plumes featuring both previous types together. These plumes are comparable in scale and temporal variation to what has been observed on other comets. We present a map of the outbursts source locations, and discuss the associated topography. We find that the spatial distribution sources on the nucleus correlates well with morphological region boundaries, especially in areas marked by steep scarps or cliffs. Outbursts occur either in the early morning or shortly after the local noon, indicating two potential processes: Morning outbursts may be triggered by thermal stresses linked to the rapid change of temperature; afternoon events are most likely related to the diurnal or seasonal heat wave reaching volatiles buried under the first surface layer. In addition, we propose that some events can be the result of a completely different mechanism, in which most of the dust is released upon the collapse of a cliff.
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Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2016, 462 (suppl. 1), pp.S184-S194. <10.1093/mnras/stw2409>
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Jean-Baptiste Vincent, Michael F. A'Hearn, Zhong-Yi Lin, Mohamed R. El-Maarry, Maurizio Pajola, et al.. Summer fireworks on comet 67P. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2016, 462 (suppl. 1), pp.S184-S194. <10.1093/mnras/stw2409>. <insu-01371064>

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