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Identification of iron sulphide grains in protoplanetary disks

Waters, L. B. F. M.; Mutschke, H.; Henning, T. +8 more

Sulphur is depleted in cold dense molecular clouds with embedded young stellar objects, indicating that most of it probably resides in solid grains. Iron sulphide grains are the main sulphur species in cometary dust particles, but there has been no direct evidence for FeS in astronomical sources, which poses a considerable problem, because sulphur…