Search Publications

Modeling of comet water production: I. Sensitivity to macro- and micro-model parameters

Küppers, M.; Hartogh, P.; Rezac, L. +3 more

Aims. This study investigates the impact of microscopic and macroscopic cometary surface properties on water production variations with heliocentric distance, focusing on dust layer thickness, grain size, nucleus shape, and spin axis orientation. Methods. We employed a two-layer thermophysical model to calculate effective gas production, incorpora…

Thermal environment and erosion of comet 67P/Churyumov-Gerasimenko

Jorda, L.; Keller, H. U.; Groussin, O. +11 more

Aims. This paper focuses on how insolation affects the nucleus of comet 67P/Churyumov-Gerasimenko over its current orbit. We aim to better understand the thermal environment of the nucleus, in particular its surface temperature variations, erosion, relationship with topography, and how insolation affects the interior temperature for the location o…

The role of the hot porous layer in the gas flow in the inner coma

Küppers, M.; Thomas, N.; Rezac, L. +5 more

Aims. The objective of this work is to study the influence of a highly non-isothermal porous dust layer on the formation of a comet's inner coma. We studied the water gas activity of comet 67P/Churyumov-Gerasimenko to find a link between the gas properties around the comet and the properties of the dust surface crust. The effects on the radiative …

Production of linear alkanes via the solid-state hydrogenation of interstellar polyynes

Li, X.; Palumbo, M. E.; Chuang, K. -J. +2 more

Context. Highly unsaturated carbon chains, including polyynes, have been detected in many astronomical regions and planetary systems. With the success of the QUIJOTE survey of the Taurus Molecular Cloud-1 (TMC-1), the community has seen a "boom" in the number of detected carbon chains. On the other hand, the Rosetta mission revealed the release of…