Iron 60 evidence for early injection and efficient mixing of stellar debris in the protosolar nebula

Dauphas, N. and Cook, D. L. and Sacarabany, A. and Froehlich, C. and Davis, A. M. and Wadhwa, M. and Pourmand, A. and Rauscher, T. and Gallino, R.. (2008) Iron 60 evidence for early injection and efficient mixing of stellar debris in the protosolar nebula. The astrophysical journal. Part 1, Vol. 686, H. 1. pp. 560-569.

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Official URL: http://edoc.unibas.ch/dok/A5253870

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Among extinct radioactivities present in meteorites, Fe-60 (t(1/2) = 1.49 Myr) plays a key role as a high-resolution chronometer, a heat source in planetesimals, and a fingerprint of the astrophysical setting of solar system formation. A critical issue with 60Fe is that it could have been heterogeneously distributed in the protoplanetary disk, calling into question the efficiency of mixing in the solar nebula or the timing of 60Fe injection relative to planetesimal formation. If this were the case, one would expect meteorites that did not incorporate 60Fe (either because of late injection or incomplete mixing) to show Ni-60 deficits (from lack of 60Fe decay) and collateral effects on other neutron-rich isotopes of Fe and Ni (coproduced with Fe-60 in core-collapse supernovae and AGB stars). Here, we show that measured iron meteorites and chondrites have Fe and Ni isotopic compositions identical to Earth. This demonstrates that 60Fe must have been injected into the protosolar nebula and mixed to less than 10 heterogeneity before formation of planetary bodies.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:University of Chicago Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:27 Mar 2014 13:12
Deposited On:22 Mar 2012 13:56

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