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How Alien Can Alien Worlds Be

V. Zh. Adibekyan, P. Figueira, N. C. Santos

Abstract
In an attempt to select stars that can host planets with characteristics similar to our own, we selected seven solar-type stars known to host planets in the habitable zone and for which spectroscopic stellar parameters are available. For these stars we estimated 'empirical' abundances of O, C, Mg and Si, which in turn we used to derive the iron and water mass fraction of the planet building blocks with the use of the model presented in Santos et al. (2015). Our results show that if rocky planets orbit these stars they might have significantly different compositions between themselves and different from that of our Earth. However, for a meaningful comparison between the compositional properties of exoplanets in the habitable zone and our own planet, a far more sophisticated analysis (e.g. Dorn et al., 2017) of a large number of systems with precise mass and radius of planets, and accurate chemical abundances of the host stars. The work presented here is merely the first humble step in this direction.

Keywords
Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics

EWASS Special Session 4 (2017): Star-planet interactions
Emeline Bolmont, Sergi Blanco-Cuaresma

EWASS 2017
Series Part 1
Volume SS4
2017 October

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia