Search Publications
Two methods for determining the temperature on the surface of the cometary nucleus based on spectroscopic measurements
Wesołowski, Marcin; Potera, Piotr; Kucab, Krzysztof
The paper presents two methods that can be used to determine the surface temperature of a cometary nucleus. The key role in this approach is played by the measurement of hemispherical albedo for selected dust analogues, which was performed using a Cary 5000 spectrometer. To most accurately reflect the actual structure of the dust layer present on …
The refractory-to-ice ratio in comet 67P: Implications on the composition of the comet-forming region of the protoplanetary disk
Morbidelli, Alessandro; Marschall, Raphael; Marrocchi, Yves
Comets, asteroids, and other small bodies are thought to be remnants of the original planetesimal population of the Solar System. As such, their physical, chemical, and isotopic properties hold crucial details on how and where they formed and how they evolved. Yet, placing precise constraints on the formation region of these bodies has been challe…
Key structural characteristics of porous layers in diffusion modelling: A study on polydispersity, shape, and hierarchy
Skorov, Yuri; Reshetnyk, Volodymyr; Blum, Jürgen +5 more
In this study, we explored various open-source models for generating porous media. These models enabled us to examine different types of porous beds, including layers of polydisperse spheres with various size distributions, layers of porous aggregates – either fragments of parent porous layers or those formed during the agglomeration of polydisper…
A fully kinetic perspective on weakly active comets: Asymmetric outgassing
Henri, Pierre; Galand, Marina; Divin, Andrey +3 more
The European Space Agency's Rosetta mission measured the complex plasma environment surrounding comet 67P/Churyumov-Gerasimenko for more than two years. In this work, the collisionless dynamics of the plasma interaction during the comet's weakly outgassing phases is investigated through a fully kinetic semi-implicit particle-in-cell approach. The …
On structural properties of Comet 67/P dust particles collected in situ by ROSETTA/COSIMA from observations of electrical fragmentation
Klaus, Hornung; Eva, Maria Mellado; Oliver, J. Stenzel +20 more
After landing on the target, the kinetic energy can be dissipated within the fragment if it consists of many elements (as in the example of the Kerttu-Ender fragment, Fig. 2). If it consists of only a few elements, as is the case for most fragments traveling longer distances, the kinetic energy is dissipated by rolling. In the case of impact fragm…
New constraints on the chemical composition and outgassing of 67P/Churyumov-Gerasimenko
Thomas, N.; Rubin, M.; Mousis, O. +4 more
Strong heterogeneities in the composition of the volatile species have been detected in the coma of comet 67P/Churyumov-Gerasimenko (67P/C-G) by the ROSINA instrument onboard the ESA's Rosetta spacecraft. However, it is not clear if these heterogeneities are indicative of heterogeneities in the near-surface nucleus composition or if the coma compo…
Dynamics of material ejected from the Hatmehit depression and landslides on comet 67P/Churyumov-Gerasimenko
Czechowski, Leszek; Kossacki, Konrad J.
In this work we investigate trajectories and regions of deposition of material ejected from depression Hatmehit on comet 67P/Churyumov-Gerasimenko. This depression, located on the lobe Head, could be a result of endogenic, possibly still ongoing, activity. We calculated trajectories of the ejecta with different initial velocities and we determined…
Outbursts of comets at large heliocentric distances: Concise review and numerical simulations of brightness jumps
Wesołowski, M.; Gronkowski, P.; Tralle, I.
The outburst of comet brightness is spectacular and well-known manifestation of the physical activity of these relatively small cosmic bodies. The outbursts of brightness are observed for periodic comets, as well as for the comets moving along parabolic trajectories. The most known comet representing such kind of activity is the comet 29P/Schwassm…
Zodiacal light observations and its link with cosmic dust: A review
Lasue, Jeremie; Levasseur-Regourd, Anny-Chantal; Renard, Jean-Baptiste
The zodiacal light is a nightglow mostly visible along the plane of the ecliptic. It represents the background radiation associated with solar light scattered by the tenuous flattened interplanetary cloud of dust particles surrounding the Sun and the planets. It is an interesting subject of study, as the source of the micrometeoroids falling on Ea…
Analogues of interplanetary dust particles to interpret the zodiacal light polarization
Lasue, J.; Levasseur-Regourd, A. C.; Hadamcik, E. +1 more