Search Publications
Impact of radial interplanetary magnetic fields on the inner coma of comet 67P/Churyumov-Gerasimenko. Hybrid simulations of the plasma environment
Goetz, Charlotte; Gunell, Herbert; Fatemi, Shahab
Context. The direction of the interplanetary magnetic field determines the nature of the interaction between a Solar System object and the solar wind. For comets, it affects the formation of both a bow shock and other plasma boundaries, as well as mass-loading. Around the nucleus of a comet, there is a diamagnetic cavity, where the magnetic field …
Dynamics and potential origins of decimeter-sized particles around comet 67P/Churyumov-Gerasimenko
Agarwal, Jessica; Grieger, Björn; Marschall, Raphael +2 more
Context. One of the primary goals of the European Space Agency's Rosetta mission to comet 67P/Churyumov-Gerasimenko was to investigate the mechanisms responsible for cometary activity.
Aims: Our aim is to learn more about the ejection process of large refractory material by studying the dynamics of decimeter-sized dust particles in the coma o…
Ejection and dynamics of aggregates in the coma of comet 67P/Churyumov-Gerasimenko
Agarwal, J.; Lemos, P.; Marschall, R. +1 more
Context. The process of gas-driven ejection of refractory materials from cometary surfaces continues to pose a challenging question in cometary science. The activity modeling of comet 67P/Churyumov-Gerasimenko, based on data from the Rosetta mission, has significantly enhanced our comprehension of cometary activity. But thermophysical models have …
Sufficiency of near-surface water ice as a driver of dust activity on comets: Rethinking the old enigma
Küppers, M.; Thomas, N.; Hartogh, P. +6 more
Context. Nearly all contemporary theoretical research on cometary dust activity relies on models depicting heat transfer and sublimation products within the near-surface porous layer. Gas flow exerts a pressure drag to the crust agglomerates, counteracting weak gravity and the tensile strength of that layer. Our interpretation of data from the Ros…
Sublimation of volatiles from H2O:CO2 bulk ices in the context of comet 67P/Churyumov-Gerasimenko. I. N2 and CO
Wurz, P.; Altwegg, K.; Rubin, M. +6 more
Context. Comets are considered to be remnants from the formation of the Solar System. ESA's Rosetta mission targeted comet 67P/Churyumov-Gerasimenko and was able to record high-quality data on its chemical composition and outgassing behaviour, including low abundances of N2 that are observed to be correlated with H2O and CO
Sublimation of volatiles from H2O:CO2 bulk ices in the context of comet 67P/Churyumov-Gerasimenko. II. Noble gases
Wurz, P.; Altwegg, K.; Rubin, M. +6 more
Context. The ROSINA instrument on board the Rosetta spacecraft measured, among others, the outgassing of noble gases from comet 67P/Churyumov-Gerasimenko. The interpretation of this dataset and unravelling underlying desorption mechanisms requires detailed laboratory studies.
Aims: We aim to improve our understanding of the desorption pattern…
Phase angle dependence of the dust cross section in a cometary coma. A simple numerical model
Agarwal, J.; Markkanen, J.; Keiser, F.
Context. Rosetta/OSIRIS took optical measurements of the intensity of scattered light from the coma of 67P/Churyumov-Gerasimenko over a wide range of phase angles. These data have been used to measure the phase angle dependent radiance profile of the dust coma.
Aims: We want to provide information about the column area densities of the dust c…
Varying water activity and momentum transfer on comet 67P/Churyumov-Gerasimenko from its non-gravitational forces and torques
Keller, H. U.; Groussin, O.; Attree, N. +9 more
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…
LBM-DEM modeling of particle-fluid interactions on active small solar bodies
Wang, Qiujun; Cheng, Bin; Baoyin, Hexi +1 more
Context. Aeolian-like surface features observed on small Solar System bodies have piqued interest in their underlying formation mechanisms. Understanding the evolution of fluid-solid interactions is crucial for elucidating the nature of cometary activity. Aims. We established a resolved fluid-particle simulation approach and implemented it into ou…
Upper limit of the solar wind protons backscattering efficiency from Comet 67P/Churyumov-Gerasimenko
Wieser, Martin; Wieser, Gabriella Stenberg; Canu-Blot, Romain
Context. Solar wind ions backscattering is a fundamental plasma-surface interaction process that may occur on all celestial bodies exposed to the solar wind and lacking a significant atmosphere or magnetosphere. Yet, observations have been limited to the regolith-covered Moon and Phobos, one of the Martian moons.
Aims: We aim to expand our kn…