TOI-1408: A Metal-rich Star with Lithium Overabundance Hosting a Multi-planet System.

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ID: 332613
2026
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Abstract
Abstract TOI-1408 is recognised as a star hosting at least two planets: the hot Jupiter TOI-1408b and the inner sub-Neptune TOI-1408c. Using high-resolution spectra with a high signal-to-noise ratio (S/N ∼ 350) and resolving power ranging from λ/Δλ = 52, 000 to 115,000, we refined the star’s fundamental parameters. The derived values are Teff = 6340 ± 40 K, log g = 4.3 ± 0.1, vturb = 1.4 ± 0.1 km s−1, and [Fe/H] = +0.26 ± 0.10 dex. We determined the abundances of 12 chemical elements in the stellar atmosphere, accounting for deviations from local thermodynamic equilibrium. For most elements, the abundance excess relative to the solar value is comparable, except for copper and particularly lithium, which show significantly higher excesses of +0.38 dex and +1.46 dex, respectively. The latter corresponds to an absolute abundance A(Li)=2.44, roughly 30 times the solar value adopted in this study (A(Li)⊙ = 0.98). This combination of high metallicity and extreme lithium overabundance is rare among planet-hosting stars with Teff > ∼6200 K. We found no evidence of accretion of a rocky planet’s material onto the central star based on the correlation of abundance with the condensation temperature of chemical elements. The structural modelling reveals a shallow, cool convective envelope that preserves lithium from destruction, providing a natural explanation for the observed overabundance.
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Authors Gazinur A. Galazutdinov, Sergey A. Korotin, Dmitry B. Poklad, E I Kazanina, Gennady G. Valyavin
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1918
URL
https://doi.org/10.1093/mnras/stag1918
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