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Metal-rich stars are less suitable for the evolution of life on their planets.

ABSTRACT: Atmospheric ozone and oxygen protect the terrestrial biosphere against harmful ultraviolet (UV) radiation. Here, we model atmospheres of Earth-like planets hosted by stars with near-solar effective temperatures (5300 to 6300 K) and a broad range of metallicities covering known exoplanet host stars. We show that paradoxically, although metal-rich stars emit substantially less ultraviolet radiation than metal-poor stars, the surface of their planets is exposed to more intense ultraviolet radiation. For the stellar types considered, metallicity has a larger impact than stellar temperature. During the evolution of the universe, newly formed stars have progressively become more metal-rich, exposing organisms to increasingly intense ultraviolet radiation. Our findings imply that planets hosted by stars with low metallicity are the best targets to search for complex life on land.

SUBMITTER: Shapiro AV

PROVIDER: S-EPMC10113254 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature

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Metal-rich stars are less suitable for the evolution of life on their planets.

Shapiro Anna V AV Brühl Christoph C Klingmüller Klaus K Steil Benedikt B Shapiro Alexander I AI Witzke Veronika V Kostogryz Nadiia N Gizon Laurent L Solanki Sami K SK Lelieveld Jos J

Nature communications 20230418 1

Atmospheric ozone and oxygen protect the terrestrial biosphere against harmful ultraviolet (UV) radiation. Here, we model atmospheres of Earth-like planets hosted by stars with near-solar effective temperatures (5300 to 6300 K) and a broad range of metallicities covering known exoplanet host stars. We show that paradoxically, although metal-rich stars emit substantially less ultraviolet radiation than metal-poor stars, the surface of their planets is exposed to more intense ultraviolet radiation ...[more]

PMID: 37072387

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