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Science 27 February 2004:
Vol. 303. no. 5662, pp. 1355 - 1358
DOI: 10.1126/science.1093283
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Reports

Carbon and Nitrogen Isotopic Anomalies in an Anhydrous Interplanetary Dust Particle

Christine Floss,1* Frank J. Stadermann,1 John Bradley,2 Zu Rong Dai,2 Sasa Bajt,2 Giles Graham2

Because hydrogen and nitrogen isotopic anomalies in interplanetary dust particles have been associated with carbonaceous material, the lack of similar anomalies in carbon has been a major conundrum. We report here the presence of a 13C depletion associated with a 15N enrichment in an anhydrous interplanetary dust particle. Our observations suggest that the anomalies are carried by heteroatomic organic compounds. Theoretical models indicate that low-temperature formation of organic compounds in cold interstellar molecular clouds can produce carbon and nitrogen fractionations, but it remains to be seen whether the specific effects observed here can be reproduced.

1 Laboratory for Space Sciences, Washington University, St. Louis, MO 63130, USA.
2 Institute for Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.

* To whom correspondence should be addressed. E-mail: floss{at}wustl.edu

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