Varying water activity and momentum transfer on comet 67P/Churyumov-Gerasimenko from its non-gravitational forces and torques

被引:3
作者
Attree, N. [1 ,2 ]
Gutierrez, P. [1 ]
Groussin, O. [3 ]
Buerger, J. [2 ]
Keller, H. U. [4 ]
Kramer, T. [5 ]
Manghi, R. Lasagni [6 ]
Laeuter, M. [7 ]
Lemos, P. [2 ]
Markkanen, J. [2 ]
Marschall, R. [8 ]
Schuckart, C. [2 ]
机构
[1] CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, Granada 18008, Spain
[2] Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, Mendelssohnstr 3, D-38106 Braunschweig, Germany
[3] Aix Marseille Univ, CNRS, CNES, Lab Astrophys Marseille, Marseille, France
[4] DLR Inst Planetenforsch, Rutherfordstr 2, D-12489 Berlin, Germany
[5] Johannes Kepler Univ Linz, Inst Theoret Phys, Linz, Austria
[6] Alma Mater Studiorum Univ Bologna, Dipartimento Ingn Ind, Via Fontanelle 40, I-47121 Forli, Italy
[7] Zuse Inst Berlin, D-14195 Berlin, Germany
[8] CNRS, Observ Cote Azur, Lab JL Lagrange, Blvd Observ,CS 34229, F-06304 Nice 4, France
关键词
methods: data analysis; celestial mechanics; comets: general; comets: individual: 67P/Churyumov-Gerasimenko; ROTATION; NUCLEUS; SUBLIMATION; STATE;
D O I
10.1051/0004-6361/202450728
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Aims. We investigate the ability of a simultaneous fitting of comet 67P/Churyumov-Gerasimenko's non-gravitational forces, torques, and total water-outgassing rate, as observed by Rosetta, to constrain complex thermophysical models of cometary material. Methods. We extend the previous work of fitting geographically defined surface outgassing models to the Rosetta observations by testing the effects of a more detailed geomorphological mapping, the resolution of the shape-model used, self-heating by neighbouring facets on the shape-model, thermal inertia in the outgassing solution, and the variation in the momentum coupling between the gas and the nucleus. We also directly compare the non-gravitational acceleration curves available in the literature. Results. We correct an error in the calculation of pole-orientation in the previous paper. We find that, under the assumptions of the model, non-gravitational forces and torques are driven by water sublimation from the nucleus, thermal inertia and self-heating have only minor effects, spatially uniform activity cannot explain 67P's non-gravitational dynamics, spatially uniform momentum transfer cannot explain 67P's non-gravitational dynamics, and different terrain types have different instantaneous responses to insolation. Conclusions. Consolidated terrain facing south on 67P/Churyumov-Gerasimenko has a high outgassing flux, a steep response to insolation, and a large gas momentum transfer coefficient. Instead, that facing north behaves differently, producing little to no water outgassing, and with a lower momentum transfer efficiency. Dusty terrain also has a lower outgassing rate and momentum transfer efficiency, and either depletes its volatile component or is buried in fall-back as the comet approaches the Sun. Momentum transfer appears correlated with insolation, likely due to an increased enhancement in the gas temperature as the dust it flows through is heated.
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页数:11
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