Document Detail

Identification of iron sulphide grains in protoplanetary disks.
MedLine Citation:
PMID:  12000914     Owner:  NLM     Status:  PubMed-not-MEDLINE    
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 is a cosmically abundant element. Here we report laboratory infrared spectra of FeS grains from primitive meteorites, as well as from pyrrhotite ([Fe, Ni](1-x)S) grains in interplanetary dust, which show a broad FeS feature centred at approximately 23.5 micrometres. A similar broad feature is seen in the infrared spectra of young stellar objects, implying that FeS grains are an important but previously unrecognized component of circumstellar dust. The feature had previously been attributed to FeO. The observed astronomical line strengths are generally consistent with the depletion of sulphur from the gas phase, and with the average Galactic sulphur/silicon abundance ratio. We conclude that the missing sulphur has been found.
L P Keller; S Hony; J P Bradley; F J Molster; L B F M Waters; J Bouwman; A De Koter; D E Brownlee; G J Flynn; T Henning; H Mutschke
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature     Volume:  417     ISSN:  0028-0836     ISO Abbreviation:  Nature     Publication Date:  2002 May 
Date Detail:
Created Date:  2002-05-09     Completed Date:  2002-05-23     Revised Date:  2003-11-03    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  England    
Other Details:
Languages:  eng     Pagination:  148-50     Citation Subset:  -    
Mail Code SR, NASA Johnson Space Center, Houston, Texas 77058, USA.
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