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Gas outflow and dust transport of comet 67P/Churyumov–Gerasimenko

Ian-Lin Lai 1 Wing-Huen Ip 2, 3, 1 Cheng-Chin Su 4 Jong-Shinn Shi 4 Jui-Chi Lee 5 Zhong-Yi Lin 2 Ying Liao 6 Nicolas Thomas 6 Holger Sierks 7 Cesare Barbieri 8 Philippe Lamy 9 Rafael Rodrigo 10 Detlef Koschny 11 Hans Rickman 12 Horst Uwe Keller 13 Jessica Agarwal 7 Michael A’hearn 14, 7 Maria Antonella Barucci 15 Jean-Loup Bertaux 16 Ivano Bertini 17 Steven Boudreault 7 Gabriele Cremonese 18 Vania da Deppo 19 Björn Davidsson 12 Stefano Debei 20 Mariolino de Cecco 21 Jakob Deller 7 Sonia Fornasier 15 Marc Fulle 22 Olivier Groussin 9 Pedro J. Gutiérrez 23 Carsten Güttler 6 Marc Hofmann 7 Stubbe F. Hviid 6, 24 Laurent Jorda 9 Jörg Knollenberg 24 Gabor Kovacs 7 J.-Rainer Kramm 7 Ekkehard Kührt 24 Michael Küppers 25 Luisa M. Lara 23 Monica Lazzarin 8 Josè J. Lopez Moreno 24 Francesco Marzari 8 Giampiero Naletto 26 Nilda Oklay 7 Xian Shi 7 Cecilia Tubiana 7 Jean-Baptiste Vincent 7
Abstract : Because of the diurnal thermal cycle and the irregular shape of the nucleus, gas outflow of comet 67P/Churyumov–Gerasimenko could be highly anisotropic as indicated by the colliminated dust jet structures on the sunlit side. Based on the OSIRIS imaging observations of the outgassing effect, a simple model of surface sublimation can be constructed by taking into account the dependence on the solar insolation. With preliminary information on the time variability of the global gas production rate, a sequence of gas coma models can be generated at different epochs before and after perihelion. We also investigate different patterns of dust particle dynamics under the influences of nuclear rotation and gas drag. From these considerations, a consistent picture of the spatial distribution of dusty materials across the surface of comet 67P as it moves around the perihelion can be developed. It is found that because of the redeposition of the ejected dust from the Southern hemisphere to the Northern hemisphere during the southern summer season the Hapi region could gain up to 0.4 m while the Wosret region would lose up to 1.8 m of dust mantle per orbit.
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Ian-Lin Lai, Wing-Huen Ip, Cheng-Chin Su, Jong-Shinn Shi, Jui-Chi Lee, et al.. Gas outflow and dust transport of comet 67P/Churyumov–Gerasimenko. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2016, 462 (Suppl_1), pp.S533 - S546. ⟨10.1093/mnras/stx332⟩. ⟨insu-01495254⟩



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