The chemical composition of planet building blocks as predicted by stellar population synthesis

Abstract

Future space missions will improve considerably our understanding of the formation and history of planetary systems. Currently, observations show that the presence of planetary companions is closely linked to the metallicity and the chemical abundances of the host stars. We aim to build an integrated tool to predict the planet building blocks composition as a function of the stellar populations, for the interpretation of the ongoing and future large surveys. We synthesize stellar populations with the Besançon Galaxy model (BGM) which includes stellar evolutionary tracks computed with the stellar evolution code STAREVOL. We integrate to the BGM a simple stoichiometric model to determine the expected composition of the planet building blocks. We determine the expected PBB composition around FGK stars, for the four galactic populations within the Milky Way. Our solar neighborhood simulations are in good agreement with the recent results obtained with the HARPS survey for f_iron, f_w and the heavy mass fraction f_Z. We present evidence of the clear dependence of f_iron and f_w with the initial alpha abundances [α/Fe] of the host star. We find that the different initial [α/Fe] distributions in the different galactic populations lead to a bimodal distribution of PBB composition and to an iron/water valley separating PBB with high and low iron/water mass fractions. We linked host star abundances and expected PBB composition in an integrated model of the Galaxy. Derived trends are an important step for statistical analyses of expected planet properties. In particular, internal structure models may use these results to derive statistical trends of rocky planets properties, constrain habitability and prepare interpretation of on-going and future large scale surveys of exoplanet search.

arXiv comment8 page, 4 figures, Accepted for publication in Astronomy and Astrophysics

References in corpus (40)

• The Gaia mission
• The Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• The PLATO 2.0 Mission
• Spectroscopic [Fe/H] for 98 extra-solar planet-host stars: Exploring the probability of planet formation
• Defining and cataloging exoplanets: The exoplanet.eu database
• The HARPS search for southern extra-solar planets XXXI. The M-dwarf sample
• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program.Galactic stellar populations and planets
• The formation and retention of gas giant planets around stars with a range of metallicities
• The age structure of stellar populations in the solar vicinity. Clues of a two-phase formation history of the Milky Way disk
• The Mass-Metallicity Relation for Giant Planets
• Can we constrain interior structure of rocky exoplanets from mass and radius measurements?
• A correlation between the heavy element content of transiting extrasolar planets and the metallicity of their parent stars
• Detailed Models of super-Earths: How well can we infer bulk properties?
• The Compositional Diversity of Extrasolar Terrestrial Planets: I. In-Situ Simulations
• Spectroscopic stellar parameters for 582 FGK stars in the HARPS volume-limited sample. Revising the metallicity-planet correlation
• Kinematics and history of the solar neighbourhood revisited
• Thermohaline instability and rotation-induced mixing. III - Grid of stellar models and asymptotic asteroseismic quantities from the pre-main sequence up to the AGB for low- and intermediate-mass stars at various metallicities
• Giant planets orbiting metal-rich stars show signatures of planet-planet interactions
• A new alpha-enhanced super-solar metallicity population
• Emerging Trends in a Period-Radius Distribution of Close-in Planets
• Constraining the thick disc formation scenario of the Milky Way
• The Besancon Galaxy model renewed I. Constraints on the local star formation history from Tycho data
• Rotating models of young solar-type stars : Exploring braking laws and angular momentum transport processes
• Overabundance of alpha-elements in exoplanet host stars
• PLATO as it is: a legacy mission for Galactic archaeology
• Oxygen abundances in G- and F-type stars from HARPS
• Orbital and physical properties of planets and their hosts: new insights on planet formation and evolution
• Constraining planet structure and composition from stellar chemistry: trends in different stellar populations
• The First Planets: the Critical Metallicity for Planet Formation
• On the correlation between metallicity and the presence of giant planets
• Jupiter Analogues Orbit Stars with an Average Metallicity Close to that of the Sun
• The Gaia-ESO survey: impact of extra-mixing on C- and N-abundances of giant stars
• OGLE-2017-BLG-1522: A giant planet around a brown dwarf located in the Galactic bulge
• Population synthesis to constrain Galactic and Stellar Physics- I- Determining age and mass of thin-disc red-giant stars
• From stellar to planetary composition: Galactic chemical evolution of Mg/Si mineralogical ratio
• A peculiarity of metal-poor stars with planets ?
• CNO behaviour in planet-harbouring stars. II. Carbon abundances in stars with and without planets using the CH band
• Elemental Abundances of Kepler Objects of Interest in APOGEE. I. Two Distinct Orbital Period Regimes Inferred from Host Star Iron Abundances
• Dependence of Small Planet Frequency on Stellar Metallicity Hidden by Their Prevalence
• Tidal Downsizing Model. III. Planets from sub-Earths to Brown Dwarfs: structure and metallicity preferences

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• Influence of sub- and super-solar metallicities on the compositions of solid planetary building blocks
• Plausible constraints on the range of bulk terrestrial exoplanet compositions in the Solar neighbourhood
• How the origin of stars in the Galaxy impacts the composition of planetary building blocks
• Chemical Composition of Bright Stars in the Continuous Viewing Zone of the TESS Space Mission
• Exoplanets Across Galactic Stellar Populations with PLATO: Estimating Exoplanet Yields Around FGK Stars for the Thin Disk, Thick Disk and Stellar Halo
• Towards a fully consistent Milky Way disk model -- IV. The impact of Gaia DR2 and APOGEE
• Predicting the water content of interstellar objects from galactic star formation histories
• Planetary mass-radius relations across the galaxy
• Generating metal-polluting debris in white dwarf planetary systems from small-impact crater ejecta
• Revealing Short-period Exoplanets and Brown Dwarfs in the Galactic Bulge using the Microlensing Xallarap Effect with the \textit{Nancy Grace Roman Space Telescope}