Tungsten nuclear anomalies in planetesimal cores

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

doi:10.1086/524882

Tungsten nuclear anomalies in planetesimal cores

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

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79 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 language	English (US)
Pages (from-to)	1234-1241
Number of pages	8
Journal	Astrophysical Journal
Volume	674
Issue number	2
DOIs	https://doi.org/10.1086/524882
State	Published - 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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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.",

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T1 - Tungsten nuclear anomalies in planetesimal cores

AU - Qin, Liping

AU - Dauphas, Nicolas

AU - Wadhwa, Meenakshi

AU - Markowski, Agnès

AU - Gallino, Roberto

AU - Janney, Philip E.

AU - Bouman, Claudia

PY - 2008/2/20

Y1 - 2008/2/20

N2 - 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.

AB - 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.

KW - Minor planets, asteroids

KW - Nuclear reactions, nucleosynthesis, abundances

KW - Solar system: formation

KW - Stars: abundances

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Tungsten nuclear anomalies in planetesimal cores

Abstract

Keywords

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