SUBMILLIMETER OBSERVATION OF JUPITER’S STRATOSPHERIC COMPOSITION: DETECTION OF CARBON MONOSULFIDE (J = 7 − 6) 19 YEARS AFTER THE COMETARY IMPACT

Abstract

ABSTRACT In Jupiter's stratosphere, gaseous carbon monosulfide (CS) was first discovered in 1994 by millimeter and ultraviolet observations as a product induced by the collision of comet Shoemaker–Levy 9 (SL9). To constrain sulfur chemistry, in 2013, 19 years after the SL9 event, we observed Jupiter's stratospheric CS J = 7 − 6 rotational transition at 0.8 mm wavelength by using the Atacama Submillimeter Telescope Experiment 10 m single-dish telescope. The CS molecular line was successfully detected with 120 mK intensity in the antenna temperature scale. The obtained CS total mass shows ∼90% decrease relative to that observed in 1998. From the line shape analysis, CS is suggested to be present above the mbar pressure level, which is comparable to that determined in 1998.