A compositional link between rocky exoplanets and their host stars

Author:

Adibekyan Vardan12ORCID,Dorn Caroline3ORCID,Sousa Sérgio G.1ORCID,Santos Nuno C.12ORCID,Bitsch Bertram4,Israelian Garik56,Mordasini Christoph7ORCID,Barros Susana C. C.12ORCID,Delgado Mena Elisa1,Demangeon Olivier D. S.12ORCID,Faria João P.12ORCID,Figueira Pedro18,Hakobyan Artur A.9ORCID,Oshagh Mahmoudreza56ORCID,Soares Bárbara M. T. B.12,Kunitomo Masanobu10ORCID,Takeda Yoichi1112ORCID,Jofré Emiliano131415ORCID,Petrucci Romina1415ORCID,Martioli Eder1617ORCID

Affiliation:

1. Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, Centro de Astrofísica da Universidade do Porto, 4150-762 Porto, Portugal.

2. Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal.

3. Institute for Computational Science, University of Zurich, CH-8057 Zurich, Switzerland.

4. Max-Planck-Institut für Astronomie, 69117 Heidelberg, Germany.

5. Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain.

6. Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain.

7. Physikalisches Institut, University of Bern, 3012 Bern, Switzerland.

8. European Southern Observatory, Alonso de Córdova 3107, Vitacura, Región Metropolitana, Chile.

9. Center for Cosmology and Astrophysics, Alikhanian National Science Laboratory, 0036 Yerevan, Armenia.

10. Department of Physics, School of Medicine, Kurume University, Fukuoka 830-0011, Japan.

11. National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan.

12. Sōgō kenkyū daigakuin daigaku, The Graduate University for Advanced Studies, Mitaka, Tokyo 181-8588, Japan.

13. Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad Universitaria, Ciudad de México, C.P. 04510, México.

14. Observatorio Astronómico de Córdoba, Universidad Nacional de Córdoba, X5000BGR Córdoba, Argentina.

15. Consejo Nacional de Investigaciones Científicas y Técnicas, C1425FQB Buenos Aires, Argentina.

16. Institut d’Astrophysique de Paris, UMR7095 Centre national de la recherche scientifique, Sorbonne Université, 75014 Paris, France.

17. Laboratório Nacional de Astrofísica, Itajubá MG 37504-364, Brazil.

Abstract

Compositions of rocky exoplanets The interior compositions of small rocky exoplanets cannot be observed directly but are expected to relate to the composition of the host star. Adibekyan et al . analyzed a sample of rocky exoplanets, inferring the planets’ iron fractions by combining their masses and radii with an interior structure model. The iron fractions of the host stars were calculated from stellar elemental abundances. The two iron fractions, that of the planets and that of the stars, correlate with each other, but the slope is steeper than 1, indicating that planet formation processes modify the compositions of rocky planets. —KTS

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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