Thermal modelling of water activity on comet 67P/Churyumov-Gerasimenko with global dust mantle and plural dust-to-ice ratio

Xuanyu Hu 1, 2 Xian Shi 1 Holger Sierks 1 Jürgen Blum 2 Jürgen Oberst 3, 4, 5 Marco Fulle 6 Ekkehard Kührt 7 Carsten Güttler 1 Bastian Gundlach 2 Horst Uwe Keller 2, 7 Stefano Mottola 7 Maurizio Pajola 8 Cesare Barbieri 9 Philippe L. Lamy 10 Rafael Rodrigo 11, 12 Detlef Koschny 13 Hans Rickman 14, 15 Jessica Agarwal 1 Michael F. A’hearn 16 Maria Antonella Barucci 17 Jean-Loup Bertaux 18 Ivano Bertini 9 Steve Boudreault 1 Irene Büttner 1 Gabriele Cremonese 19 Vania Da Deppo 20 Björn Davidsson 21 Stefano Debei 22 Mariolino De Cecco 23 Jakob Deller 1 Sonia Fornasier 17 Olivier Groussin 10 Pedro J. Gutiérrez 24 Pablo Gutiérrez-Marqués 1 Ian Hall 1 Marc Hofmann 1 Stubbe F. Hviid 25 Wing-Huen Ip 26 Laurent Jorda 10 Jörg Knollenberg 7 Gabor Kovacs 1 J.-Rainer Kramm 1 Michael Küppers 27 Luisa M. Lara 24 Monica Lazzarin 9 José J. López-Moreno 24 Francesco Marzari 9 Giampiero Naletto 28, 20, 29 Nilda Oklay 7 Michael L. Richards 1 Joachim Ripken 1 Nicolas Thomas 30, 31 Cécilia Tubiana 1 Jean-Baptiste Vincent 7
1 MPS - Max-Planck-Institut für Sonnensystemforschung
2 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
3 TUB - Technische Universität Berlin
4 Institut für Geodäsie und Geoinformationstechnik
5 MIIGAiK - Moscow State University of Geodesy and Cartography
6 OAT - INAF - Osservatorio Astronomico di Trieste
7 DLR Institut für Planetenforschung
8 ARC - NASA Ames Research Center
9 Dipartimento di Fisica e Astronomia "Galileo Galilei"
10 LAM - Laboratoire d'Astrophysique de Marseille
11 ISSI - International Space Science Institute
12 CAB - Centro de Astrobiologia [Madrid]
13 ESTEC - European Space Research and Technology Centre
14 CBK - Space Research Centre [Warsaw]
15 Department of Physics and Astronomy [Uppsala]
16 Department of Astronomy [College Park]
17 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
18 IMPEC - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
19 OAPD - INAF - Osservatorio Astronomico di Padova
20 IFN - CNR Institute for Photonics and Nanotechnologies
21 JPL - Jet Propulsion Laboratory
22 Department of Industrial Engineering [Padova]
23 University of Trento [Trento]
24 IAA - Instituto de Astrofísica de Andalucía
25 DLR Institute of Planetary Research
26 Institute of Space Science [Taiwan]
27 Operations Department (ESAC)
28 CISAS - Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
29 DEI - Department of Information Engineering [Padova]
30 Physikalisches Institut [Bern]
31 CSH - Center for Space and Habitability
Abstract : We perform a thermo-physical analysis on water activity of comet 67P/Churyumov-Gerasimenko (67P). The sublimation of water is assumed to occur from beneath a global, desiccated dust mantle over the irregular-shaped nucleus. The concept of two thermal models, the recipe of model formulation and the strategy of application to comet 67P are described. For an accurate and efficient evaluation of energy input by insolation and self-heating over the nucleus, a Landscape data base is devised based on polyhedral shape models of the nucleus. We apply the thermal models to investigate the impact of certain parameters of nucleus properties on water production. It is found that the measured water production of 67P can be overall attributed to sublimation of water ice with a mass abundance of a few to 10 per cent beneath a uniform dust mantle of several millimetres to one centimetre in thickness. Insofar as 67P is concerned, we argue against the necessity to invoke assumptions on localized water activity, or on the distinction of active/dormant surface areas.
Keywords : Volatile Refractory Numerical methods Comets 67P/Churyumov-Gerasimenko
Type de document :
Article dans une revue
Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2017, 469 (Suppl_2), pp.S295 - S311. 〈10.1093/mnras/stx1607〉
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Xuanyu Hu, Xian Shi, Holger Sierks, Jürgen Blum, Jürgen Oberst, et al.. Thermal modelling of water activity on comet 67P/Churyumov-Gerasimenko with global dust mantle and plural dust-to-ice ratio. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2017, 469 (Suppl_2), pp.S295 - S311. 〈10.1093/mnras/stx1607〉. 〈insu-01574567〉

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