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Observability of ultraviolet NI lines in the atmosphere of transiting Earth-like planets

France, Kevin; Cubillos, Patricio E.; Fossati, Luca +5 more

Nitrogen is a biosignature gas that cannot be maintained in its Earth-like ratio with CO₂ under abiotic conditions. It has also been proven to be notoriously hard to detect at optical and infrared wavelengths. Fortunately, the ultraviolet region, which has only recently started being explored for terrestrial exoplanets, may provide new …