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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 50806.0, MPI für Astronomie / Publikationen_mpia
Identification of Iron Sulfide Grains in Protoplanetary Disks
Authors:Keller, L. P.; Hony, S.; Bradley, J. P.; Molster, F. J.; Waters, L. B. F. M.; Bouwman, J.; de Koter, A.; Brownlee, D. E.; Flynn, G. J.; Henning, T.; Mutschke, H.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Nature
Volume:417
Start Page:148
End Page:150
Review Status:not specified
Audience:Not Specified
Abstract / Description: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-xS) grains in interplanetary dust, which show a broad FeS feature centred at ~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.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Houston, Texas 77058, USA), AB(Astronomical Institute Anton Pannekoek, Amsterdam, Kruislaan 403, NL-1098 SJ, The Netherlands), AC(School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA), AD(ESTEC/ESA, RSSD-ST, Keplerlaan 1, NL-2201 AZ Noordwijk, The Netherlands), AE(Astronomical Institute Anton Pannekoek, Amsterdam, Kruislaan 403, NL-1098 SJ, The Netherlands), AF(CEA, DSM, DAPNIA, Service d'Astrophysique, CEN Saclay, F-91191 Gif-sur-Yvette Cedex, France), AG(Astronomical Institute Anton Pannekoek, Amsterdam, Kruislaan 403, NL-1098 SJ, The Netherlands), AH(Department of Astronomy, University of Washington, Seattle, Washington 98195, USA), AI(Department of Physics, SUNY, Plattsburgh, New York 12901, USA), AJ(Astrophysical Institute and University Observatory,Jena, Germany), AK(Astrophysical Institute and University Observatory, Jena, Germany)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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