Journal
SCIENCE
Volume 303, Issue 5662, Pages 1355-1358Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1093283
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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 C-13 depletion associated with a N-15 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.
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