No statistically significant evidence for a correlation between stellar and planetary composition

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ID: 328742
2026
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Abstract
Abstract The chemical compositions of planets and their hosts stars are intrinsically linked, having formed from the same protostellar material. Characterising this relationship provides key constraints on the processes governing planetary formation and evolution. Focusing on host stars with near-solar chemical abundances limits our understanding of how planetary composition varies across a broader chemical parameter space. Expanding the sample to include stars with compositions markedly different from the Sun is therefore essential for building a complete picture of star–planet compositional connections. Here, we focus specifically on iron-poor hosts since they are more likely to be alpha-enhanced and represent some of the most chemically distinct stars relative to the Sun (i.e., thick disc stars). We present a sample of 45 stars hosting 64 planets across the super-Earth and sub-Neptune regimes, for which we homogeneously obtain new stellar parameters including abundances, re-derive planetary mass and radius, and model the bulk interior compositions of their planetary companions. No statistically significant evidence for a correlation between stellar and planetary composition was found in our sample. We suggest that this null result is primarily driven by the large uncertainties inherent to both compositional proxies, which may obscure an underlying relationship. Quantifying these uncertainties is therefore a critical step that previous studies have not fully addressed. Furthermore, even with improved precision, uncovering such a relation may require a higher-dimensional treatment that accounts for additional parameters such as planetary equilibrium temperature.
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openalex_W7213419160 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Daisy A. Turner, Annelies Mortier, James G. Rogers, Jo Ann Egger, Alix Violet Freckelton, Tim Lichtenberg, Anjali A A Piette
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1756
URL
https://doi.org/10.1093/mnras/stag1756
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