Exoplanet hosts reveal lithium depletion: Results from a homogeneous statistical analysis
P. Figueira, J. P. Faria, E. Delgado-Mena, V. Zh. Adibekyan, S. G., Sousa, N. C. Santos, G. Israelian

TL;DR
This study uses a homogeneous statistical approach to show that stars hosting exoplanets tend to have lower lithium abundances than similar stars without planets, indicating a possible link between planet presence and stellar lithium depletion.
Contribution
The paper introduces a multivariable regression method to analyze lithium abundance differences between planet-hosting and non-hosting stars, explicitly accounting for stellar parameters and confirming lithium depletion in hosts.
Findings
Planet-host stars show significant lithium depletion compared to non-hosts.
The lithium depletion offset remains significant under various dataset constraints.
A large increase in lithium uncertainty estimates is needed to nullify the observed depletion.
Abstract
Aims. We study the impact of the presence of planets on the lithium abundance of host stars and evaluate the previous claim that planet hosts exhibit lithium depletion when compared to their non-host counterparts. Methods. Using previously published lithium abundances, we remove the confounding effect of the different fundamental stellar parameters by applying a multivariable regression on our dataset. In doing so, we explicitly make an assumption made implicitly by different authors: that lithium abundance depends linearly on fundamental stellar parameters. Using a moderator variable to distinguish stars with planets from those without, we evaluate the existence of an offset in lithium abundances between the two groups. We perform this analysis first for stars that present a clear lithium detection exclusively and include in a second analysis upper lithium measurements. Results.…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomical and nuclear sciences · Economic Growth and Productivity
