Emerging trends in metallicity and lithium properties of debris disc stars

Abstract

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.

Accepted for publication in MNRAS. 19 pages, 10 figures

References in corpus (39)

• New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
• Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
• Basic physical parameters of a selected sample of evolved stars
• A Steeper than Linear Disk Mass-Stellar Mass Scaling Relation
• Debris Disk Evolution Around A Stars
• A new code for automatic determination of equivalent widths: Automatic Routine for line Equivalent widths in stellar Spectra (ARES)
• Debris disks around Sun-like stars
• Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity
• Precise radial velocities of giant stars. III. Spectroscopic stellar parameters
• Variations on Debris Disks: Icy Planet Formation at 30-150 AU for 1-3 Solar Mass Main Sequence Stars
• The Complete Census of 70-um-Bright Debris Disks within the FEPS (Formation and Evolution of Planetary Systems) Spitzer Legacy Survey of Sun-like Stars
• Stellar Winds on the Main-Sequence II: the Evolution of Rotation and Winds
• Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity
• Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems
• New Debris Disks Around Nearby Main Sequence Stars: Impact on The Direct Detection of Planets
• Lithium depletion and the rotational history of exoplanet host stars
• Evolved stars hint to an external origin of enhanced metallicity in planet-hosting stars
• Abundances in the Local Region II: F, G and K Dwarfs and Subgiants
• Stellar parameters and chemical abundances of 223 evolved stars with and without planets
• Do Two Temperature Debris Disks Have Multiple Belts?
• SONS: The JCMT legacy survey of debris discs in the submillimetre
• Five steps in the evolution from protoplanetary to debris disk
• First scattered light images of debris disks around HD 53143 and HD 139664
• Does the presence of planets affect the frequency and properties of extrasolar Kuiper Belts? Results from the Herschel DEBRIS and DUNES surveys
• The Formation and Evolution of Planetary Systems: Description of the Spitzer Legacy Science Database
• Metallicities of Planet Hosting Stars: A Sample of Giants and Subgiants
• A Direct Imaging Survey of Spitzer detected debris disks: Occurrence of giant planets in dusty systems
• Searching for signatures of planet formation in stars with circumstellar debris discs
• The Chemical Compositions of Stars with Planets: A Review
• On the Relationship Between Debris Disks and Planets
• Correlations between the stellar, planetary and debris components of exoplanet systems observed by $\text{Herschel}$
• The GAPS Programme with HARPS-N@TNG V. A comprehensive analysis of the XO-2 stellar and planetary systems
• Lithium Abundances in a Sample of Planet Hosting Dwarfs
• ALMA Detection of Extended Millimeter Halos in the HD 32297 and HD 61005 Debris Disks
• Mass and Temperature of the TWA 7 Debris Disk
• Parent Stars of Extrasolar Planets - XIII. Additional Evidence for Li Abundance Anomalies
• Spitzer-MIPS Observations of the eta Cha Young Association
• Exoplanet hosts reveal lithium depletion: Results from a homogeneous statistical analysis
• Spitzer Far-Infrared Detections of Cold Circumstellar Disks

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• The bi-modal ${}^7$Li distribution of the Milky Way's thin-disk dwarf stars: The role of Galactic-scale events and stellar evolution
• The Direct Mid-Infrared Detectability of Habitable-zone Exoplanets Around Nearby Stars
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• A Sequoia stellar candidate with very high 7Li and 9Be