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

N. Dauphas, D. L. Cook, A. Sacarabany, C. Fröhlich, A. M. Davis, Meenakshi Wadhwa, A. Pourmand, T. Rauscher, R. Gallino

Research output: Contribution to journalArticle

80 Scopus citations

Abstract

Among extinct radioactivities present in meteorites, 60Fe (t1/2 = 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 60Ni deficits (from lack of 60Fe decay) and collateral effects on other neutron-rich isotopes of Fe and Ni (coproduced with 60Fe 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.

Original languageEnglish (US)
Pages (from-to)560-569
Number of pages10
JournalAstrophysical Journal
Volume686
Issue number1
DOIs
StatePublished - Oct 10 2008

Keywords

  • Methods: analytical
  • Nuclear reactions, nucleosynthesis, abundances
  • Solar system: formation
  • Supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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