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A stringent upper limit to SO₂ in the Martian atmosphere

Forget, F.; Encrenaz, T.; Atreya, S. K. +6 more

Surfur-bearing molecules have been found at the surface of Mars by the Viking lander, the Spirit and Opportunity rovers, and the OMEGA infrared spectrometer aboard Mars Express. However, no gaseous sulfur-bearing species have ever been detected in the Martian atmosphere. We search for SO₂ signatures in the thermal spectrum of Mars at 7.…