Carbon and nitrogen isotopic anomalies in an anhydrous interplanetary dust particle.
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.
Floss
Christine
C
Laboratory for Space Sciences, Washington University, St. Louis, MO 63130, USA. floss@wustl.edu
Stadermann
Frank J
FJ
Bradley
John
J
Dai
Zu Rong
ZR
Bajt
Sasa
S
Graham
Giles
G
D002247:Carbon Isotopes / Q000032:analysis*; D019443:Cosmic Dust / Q000032:analysis*; D006838:Hydrocarbons / Q000737:chemistry; D013058:Mass Spectrometry; D009587:Nitrogen Isotopes / Q000032:analysis*; D009930:Organic Chemicals / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013696:Temperature
D002247:Carbon Isotopes; D019443:Cosmic Dust; D006838:Hydrocarbons; D009587:Nitrogen Isotopes; D009930:Organic Chemicals