Connections between Planetary Populations and the Chemical Characteristics of their Host Stars
arxiv(2024)
摘要
Chemical anomalies in planet-hosting stars (PHSs) are studied in order to
assess how the planetary nature and multiplicity affect the atmospheric
chemical abundances of their host stars. We employ APOGEE DR17 to select
thin-disk stars of the Milky Way, and cross-match them with the Kepler Input
Catalog to identify confirmed PHSs, which results in 227 PHSs with available
chemical-abundance ratios for six refractory elements. We also examine an
ensemble of stars without planet signals, which are equivalent to the selected
PHSs in terms of evolutionary stage and stellar parameters, to correct for
Galactic chemical-evolution effects, and derive the abundance gradient of
refractory elements over the condensation temperature for the PHSs. Using the
Galactic chemical-evolution corrected abundances, we found that PHSs do not
show a significant difference in abundance slope from the stars without
planets. Furthermore, we examine the depletion trends of refractory elements of
PHSs depending on total number of planets and their types, and find that the
PHSs with giant planets are more depleted in refractory elements than those
with rocky planets. Among the PHSs with rocky planets, the refractory-depletion
trends are potentially correlated with the terrestrial planets' radii and
multiplicity. In the cases of PHSs with giant planets, sub-Jovian PHSs
demonstrated more depleted refractory trends than stars hosting Jovian-mass
planets, raising questions on different planetary-formation processes for
Neptune-like and Jupiter-like planets.
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