Composition of super-Earths, super-Mercuries, and their host stars

Author:

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., , , , , , , , , , , , ,

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 f star 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.

Publisher

National Academy of Sciences of the Republic of Armenia

Subject

General Medicine,General Chemistry

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