Constraining planet structure and composition from stellar chemistry: trends in different stellar populations

Santos, N. C.; Adibekyan, V.; Dorn, C.; Mordasini, Christoph; Noack, L.; Barros, S. C. C.; Delgado-Mena, E.; Demangeon, O.; Faria, J. P.; Israelian, G.; Sousa, S. G. (2017). Constraining planet structure and composition from stellar chemistry: trends in different stellar populations. Astronomy and astrophysics, 608(A94), A94. EDP Sciences 10.1051/0004-6361/201731359

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The chemical composition of stars that have orbiting planets provides important clues about the frequency, architecture, and composition of exoplanet systems. We explore the possibility that stars from different galactic populations that have different intrinsic abundance ratios may produce planets with a different overall composition. We compiled abundances for Fe, O, C, Mg, and Si in a large sample of solar neighbourhood stars that belong to different galactic populations. We then used a simple stoichiometric model to predict the expected iron-to-silicate mass fraction and water mass fraction of the planet building blocks, as well as the summed mass percentage of all heavy elements in the disc. Assuming that overall the chemical composition of the planet building blocks will be reflected in the composition of the formed planets, we show that according to our model, discs around stars from different galactic populations, as well as around stars from different regions in the Galaxy, are expected to form rocky planets with significantly different iron-to-silicate mass fractions. The available water mass fraction also changes significantly from one galactic population to another. The results may be used to set constraints for models of planet formation and chemical composition. Furthermore, the results may have impact on our understanding of the frequency of planets in the Galaxy, as well as on the existence of conditions for habitability.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Mordasini, Christoph

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science
500 Science > 530 Physics

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Janine Jungo

Date Deposited:

18 Apr 2018 13:49

Last Modified:

22 Mar 2019 09:22

Publisher DOI:

10.1051/0004-6361/201731359

BORIS DOI:

10.7892/boris.112381

URI:

https://boris.unibe.ch/id/eprint/112381

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