C/O vs Mg/Si ratios in solar type stars: The HARPS sample
| Autor: | Garik Israelian, V. Zh. Adibekyan, L. Suarez-Andres, Nuno C. Santos, E. Delgado Mena, S. G. Sousa, J. I. González Hernández |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Earth and Planetary Astrophysics (astro-ph.EP) education.field_of_study Solar System 010504 meteorology & atmospheric sciences Population FOS: Physical sciences Astronomy and Astrophysics Context (language use) Astrophysics Planetary system 01 natural sciences Stars Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science Planet 0103 physical sciences education 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences Astrophysics - Earth and Planetary Astrophysics |
| DOI: | 10.48550/arxiv.1801.09474 |
| Popis: | Aims. We present a detailed study of the Mg/Si and C/O ratios and their importance in determining the mineralogy of planetary companions. Methods. Using 499 solar-like stars from the HARPS sample, we determine C/O and Mg/Si elemental abundance ratios to study the nature of the possible planets formed. We separated the planetary population in low-mass planets ( < 30 $\rm M_{\odot}$) and high-mass planets ( > 30 $\rm M_{\odot}$) to test for possible relation with the mass. Results. We find a diversity of mineralogical ratios that reveal the different kinds of planetary systems that can be formed, most of them dissimilar to our solar system. The different values of the Mg/Si and C/O ratios can determine different composition of planets formed. We found that 100\% of our planetary sample present C/O < 0.8. 86\% of stars with high-mass companions present 0.8 > C/O > 0.4, while 14\% present C/O values lower than 0.4. Regarding Mg/Si, all stars with low-mass planetary companion showed values between 1 and 2, while 85% of the high-mass companion sample does. The other 15\% showed Mg/Si values below 1. No stars with planets were found with Mg/Si > 2. Planet hosts with low-mass companions present C/O and Mg/Si ratios similar to those found in the Sun, whereas stars with high-mass companions have lower C/O. 9 pages, 12 figues. Accepted in A&A |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|