Tungsten nuclear anomalies in planetesimal cores

Liping Qin, Nicolas Dauphas, Meenakshi Wadhwa, Agnès Markowski, Roberto Gallino, Philip E. Janney, Claudia Bouman

Research output: Contribution to journalArticle

67 Scopus citations

Abstract

Use of the extinct 182Hf-182W chronometer to constrain the timing of planetary accretion and differentiation rests on the assumption that the solar nebula had homogeneous tungsten isotopic composition. Here, we report deficiencies of ∼0.1 part in 10,000 in the abundance of 184W in group IVB iron meteorites relative to the silicate Earth. These are most likely due to incomplete mixing at the planetesimal scale (2-4 km radius bodies) of the products of slow (s-) and rapid (r-) neutron-capture nucleosynthesis in the solar nebula. The correction that must be applied to the 182Hf- 82W model age of core formation in IVB irons due to the presence of these nuclear anomalies is ∼0.5 Myr.

Original languageEnglish (US)
Pages (from-to)1234-1241
Number of pages8
JournalAstrophysical Journal
Volume674
Issue number2
DOIs
StatePublished - Feb 20 2008

Keywords

  • Minor planets, asteroids
  • Nuclear reactions, nucleosynthesis, abundances
  • Solar system: formation
  • Stars: abundances

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Qin, L., Dauphas, N., Wadhwa, M., Markowski, A., Gallino, R., Janney, P. E., & Bouman, C. (2008). Tungsten nuclear anomalies in planetesimal cores. Astrophysical Journal, 674(2), 1234-1241. https://doi.org/10.1086/524882