Emerging trends in metallicity and lithium properties of debris disc stars
| Autor: | G. Pinzon, Luan Ghezzi, F. Llorente de Andrés, C. A. Giuppone, C. B. Pereira, C. Chavero, R. de la Reza |
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| Rok vydání: | 2019 |
| Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
Physics 010308 nuclear & particles physics Metallicity FOS: Physical sciences Astronomy chemistry.chemical_element Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Planetary system 01 natural sciences Debris Stars Astrophysics - Solar and Stellar Astrophysics chemistry Space and Planetary Science 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Lithium Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 487:3162-3177 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | Dwarf stars with debris discs and planets appear to be excellent laboratories to study the core accretion theory of planets formation. These systems are however, insufficiently studied. In this paper we present the main metallicity and lithium abundance properties of these stars together with stars with only debris discs and stars with only planets. Stars without detected planets nor discs are also considered. The analysed sample is formed by main-sequence FGK field single stars. Apart from the basic stellar parameters, we include the use of dusty discs masses. The main results show for the first time that the dust mass of debris disc stars with planets correlate with metallicity. We confirm that these disc dust masses are related to their central stellar masses. Separately, the masses of stars and those of planets also correlate with metallicity. We conclude that two conditions are necessary to form giant planets: to have a sufficient metallicity and also a sufficient protoplanetary mass of gas and dust. The debris discs masses of stars without giant planets do not correlate with metallicity, because they do not fulfil these two conditions. Concerning lithium, by adopting a stellar model for lithium depletion based on a strong interaction between the star and a protoplanetary disc, we found that in agreement with the model predictions, observations indicate that the main lithium depletion occurs during this initial protoplanetary evolution stage. We show that the ultimately lithium depletion is independent of the presence or absence of planets and appears to be only age dependent. Comment: Accepted for publication in MNRAS. 19 pages, 10 figures |
| Databáze: | OpenAIRE |
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