Organic chemistry in the ionosphere of the early Earth

Benjamin Fleury (1) , Ludovic Vettier (2) , Nathalie Carrasco (1)

1 PLANETO - LATMOS
2 LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales

The emergence of life on the Early Earth during the Archean has required a prior complex organic chemistry providing the prerequisite bricks of life. The origin of the organic matter and its evolution on the early Earth is far from being understood. Several hypotheses are investigated, possibly complementary, which can be divided in two main categories: the endogenous and the exogenous sources. In this work we have been interested in the contribution of a specific endogenous source: the organic chemistry occurring in the ionosphere of the early Earth. At these high altitudes, the VUV contribution of the young sun was important, involving an efficient production of reactive species. Here we address the issue whether this chemistry can lead to the production of larger molecules with a prebiotic interest in spite of the competitive lysing effect of the harsh irradiation at these altitudes.

Domaines: Planétologie et astrophysique de la terre [astro-ph.EP]

Benjamin Fleury, Ludovic Vettier, Nathalie Carrasco. Organic chemistry in the ionosphere of the early Earth. European Planetary Science Congress 2015, Sep 2015, Nantes, France. pp.EPSC2015-4. ⟨insu-01208323⟩