Different UV spectra for TRAPPIST-1 produce order-of-magnitude variations in CH4, CO, O2, and O3 abundances for Archean-analog TRAPPIST-1 e atmospheres, generating photochemical degeneracies and potential false-positive biosignatures.
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In 1D N2-CO2-H2O model atmospheres, increasing background N2 pressure warms the climate under low CO2 via H2O dilution and under high CO2 via H2O loading, while high N2 induces cooling via Rayleigh scattering that can be overwhelmed by enhanced H2O absorption.
citing papers explorer
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Ultraviolet-Driven Atmospheric Degeneracies Challenge Conventional Biosignature Frameworks for Terrestrial Planets with Ultracool M Dwarf Hosts: An Archean-Analog TRAPPIST-1 e Case Study
Different UV spectra for TRAPPIST-1 produce order-of-magnitude variations in CH4, CO, O2, and O3 abundances for Archean-analog TRAPPIST-1 e atmospheres, generating photochemical degeneracies and potential false-positive biosignatures.
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Revisiting the greenhouse effect of non-greenhouse gases in the atmospheres of Earth-like planets
In 1D N2-CO2-H2O model atmospheres, increasing background N2 pressure warms the climate under low CO2 via H2O dilution and under high CO2 via H2O loading, while high N2 induces cooling via Rayleigh scattering that can be overwhelmed by enhanced H2O absorption.