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Title:
Composition of super-Earths, super-Mercuries, and their host stars
Creator:
Adibekyan, V. ; Santos, N. C. ; Dorn, C. ; Sousa, S. G. ; Hakobyan, A. A. ; Bitsch, B. ; Mordasini, Ch. ; Barros, S. C. C. ; Delgado Mena, E. ; Demangeon, O. D. S. ; Faria, J. P. ; Figueira, P. ; Soares, B. M. T. B. ; Israelian, G.
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Uncontrolled Keywords:
exoplanets ; composition ; stars
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Abstract:
Because of their common origin, it was assumed that the composition of planet building blocks should, to a first order, correlate with stellar atmospheric composition, especially for refractory elements. In fact, information on the relative abundance of refractory and major rock-forming elements such as Fe, Mg, Si has been commonly used to improve interior estimates for terrestrial planets. Recently Adibekyan et al. (2021) presented evidence of a tight chemical link between rocky planets and their host stars. In this study we add six recently discovered exoplanets to the sample of Adibekyan et al. and re-evaluate their findings in light of these new data. We confirm that i) iron-mass fraction of rocky exoplanets correlates (but not a 1:1 relationship) with the composition of their host stars, ii) on average the iron-mass fraction of planets is higher than that of the primordial fstar iron , iii) super-Mercuries are formed in disks with high iron content. Based on these results we conclude that disk-chemistry and planet formation processes play an important role in the composition, formation, and evolution of super-Earths and super-Mercuries.