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Peer-reviewedCC BY 4.0Monthly Notices of the Royal Astronomical Society

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

  • G A Galazutdinov1,2
  • S A Korotin1
  • D B Poklad1
  • E I Kazanina1
  • G G Valyavin2
  1. 1Crimean Astrophysical Observatory of RAS , Nauchny 298409, Crimea
  2. 2Special Astrophysical Observatory, Russian Academy of Sciences , Nizhnii Arkhyz, 369167 ,
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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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Cite

BibTeXRIS
BibTeX
@article{galazutdinov2026toi1408,
  title = {{TOI-1408: A Metal-rich Star with Lithium Overabundance Hosting a Multi-planet System.}},
  author = {G A Galazutdinov and S A Korotin and D B Poklad and E I Kazanina and G G Valyavin},
  journal = {Monthly Notices of the Royal Astronomical Society},
  year = {2026},
  month = oct,
  doi = {10.1093/mnras/stag1918},
  url = {https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag1918/8931751},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - TOI-1408: A Metal-rich Star with Lithium Overabundance Hosting a Multi-planet System.
AU  - G A Galazutdinov
AU  - S A Korotin
AU  - D B Poklad
AU  - E I Kazanina
AU  - G G Valyavin
PY  - 2026
DA  - 2026/10/16
JO  - Monthly Notices of the Royal Astronomical Society
DO  - 10.1093/mnras/stag1918
UR  - https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag1918/8931751
AB  - 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.
SN  - 0035-8711
SN  - 1365-2966
ER  -