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Hydrocarbons are observed in the gas or solid phases of solar system objects,including comets, Trans-Neptunian Objects, planets and their moons. In thepresence of water ice in these environments, hydrocarbons-bearing clathratehydrates could form. In clathrate hydrates, guest molecules are trapped incrystalline water cages of different sizes, a phase used in models of planetary(sub-)surfaces or icy bodies such as comets. The phases in presence, thepotential estimate of abundances of hydrocarbon species, the spectroscopicbehaviour of hydrocarbon species in the different phases must be recorded toprovide reference spectra for the comparison with remote observations. We showin this study the specific encaged ethylene signatures, with bands similar inposition, but shifted from the pure ethylene ice spectrum. They show a markedtemperature dependence both in position and width. Some vibrational modes areactivated in the infrared by interaction with the water ice cages.

Infrared spectroscopy of clathrate hydrates for planetary science: the ethylene case