Chemical composition of Earth-like planets

Ronco, M.P.; Thiabaud, Amaury; Marboeuf, Ulysse; Alibert, Yann; de Elìa, G.C.; Guilera, O.M. (2015). Chemical composition of Earth-like planets. Boletín de la Asociación Argentina de Astronomía, 57, pp. 251-253. Asociación Argentina de Astronomía, La Plata, Argentina

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Models of planet formation are mainly focused on the accretion and dynamical processes of the planets, neglecting their chemical composition. In this work, we calculate the condensation sequence of the different chemical elements for a low-mass protoplanetary disk around a solar-type star. We incorporate this sequence of chemical elements (refractory and volatile elements) in our semi-analytical model of planet formation which calculates the formation of a planetary system during its gaseous phase. The results of the semi-analytical model (final distributions of embryos and planetesimals) are used as initial conditions to develope N-body simulations that compute the post-oligarchic formation of terrestrial-type planets. The results of our simulations show that the chemical composition of the planets that remain in the habitable zone has similar characteristics to the chemical composition of the Earth. However, exist differences that can be associated to the dynamical environment in which they were formed.

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