Association of volatile species to the main ices in comet 67P/Churyumov-Gerasimenko

ESAs Rosetta mission accompanied comet 67P/Churyumov-Gerasimenko (67P) for over two years between 2014 2016. On board was ROSINA, the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (Balsiger et al. 2007), which measured, in situ, the composition of the gaseous coma.The set of molecules monitored included highly volatile species, such as carbon monoxide and methane, together with the main coma gases, water and carbon dioxide. In our recent work (Rubin et al., 2023), we have shown that the local coma abundances of highly volatile species can be reproduced by a linear combination of H2O and CO2, indicating that they are also associated in the ices of the comets nucleus.In this presentation, we will report on these findings and further investigate correlations and variations between different volatile species.ReferencesBalsiger et al., ROSINA Rosetta Orbiter Spectrometer for Ion and Neutral Analysis, SSR, 128(1), 745801, 2007.Rubin et al., Volatiles in the H2O and CO2 ices of comet 67P/Churyumov-Gerasimenko, MNRAS, 526, 3, 42094233, 2023.