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Atmospheres, Climate, Weather

Distinguishing N2-Dominated from O2-Dominated Atmospheres on Terrestrial Exoplanets with Reflected-Light Spectroscopy

[astro-ph.EP] Reflected-light spectra of Earth-sized exoplanets promise to probe habitability and biosignatures, but interpreting atmospheric oxygen can be challenging because O2 can arise from both biological and abiotic processes. In addition, reflected-light retrievals exhibit degeneracies among atmospheric composition, clouds, surface reflectance, and gravity. We use the Bayesian retrieval framework ExoReLℜ, leveraging recent model developments that…

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Imaging & Spectroscopy

Biosignatures & Paleobiology

Hidden In Plain Sight In Ryugu And Meteorites

[Kanazawa University] Asteroid Ryugu and some carbonaceous meteorites, which are thought to have similar origins in the early Solar System, are known as chemically “primitive”…

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