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Gas-phase sulphur bearing volatiles appear to be severely depleted inprotoplanetary disks. The detection of CS and non-detections of SO and SO2 inmany disks have shown that the gas in the warm molecular layer, where giantplanets accrete their atmospheres, has a high C/O ratio. In this letter, wereport the detection of SO and SO2 in the Oph-IRS 48 disk using ALMA. This isthe first case of prominent SO2 emission detected from a protoplanetary disk.The molecular emissions of both molecules is spatially correlated with theasymmetric dust trap. We propose that this is due to the sublimation of ices atthe edge of the dust cavity and that the bulk of the ice reservoir iscoincident with the millimetre dust grains. Depending on the partition ofelemental sulphur between refractory and volatile materials the observedmolecules can account for 15-100% of the total sulphur budget in the disk. Instrong contrast to previous results, we constrain the C/O ratio from the CS/SOratio to be < 1 and potentially solar. This has important implications for theelemental composition of planets forming within the cavities of warm transitiondisks.

A major asymmetric ice trap in a planet-forming disk: II. prominent SO and SO2 pointing to C/O < 1