Bouquet, A; Mousis, O; Teolis, B; Nicolaou, G; Ozgurel, O; Pauzat, F; Ellinger, Y; ... Waite, JH; + view all Bouquet, A; Mousis, O; Teolis, B; Nicolaou, G; Ozgurel, O; Pauzat, F; Ellinger, Y; Ronnet, T; Waite, JH; - view fewer (2018) Limits on the Contribution of Endogenic Radiolysis to the Presence of Molecular Oxygen in Comet 67P/Churyumov-Gerasimenko. Astrophysical Journal , 864 (1) 10.3847/1538-4357/aad22f.

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Abstract

Radiolytic production has been proposed as a potential source for the molecular oxygen observed in comet 67P/Churyumov-Gerasimenko. Radiolysis can be exogenic or endogenic, the latter due to radionuclides present in the dust constitutive of the comet nucleus. We investigated the possibility of forming a significant amount of molecular oxygen through endogenic radiolysis. We applied a model of radiolytic production, developed for an Earth rock-water mixture, and improved it to account for the effect of the size of a radionuclide-bearing grain on the net radiation deposited in its ice mantle. We calculated the possible production of molecular oxygen considering the available experimental values of radiolytic yields. We found that endogenic radiolysis cannot account for the totality of the 3.8% (relative to water) O2abundance derived from the ROSINA observations, with an end member case of our model producing at most a 1% abundance. By contrast, we predict H2O2production leads to an abundance up to two orders of magnitude above observed values.

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