Tungsten Nuclear Anomalies in Planetesimal Cores

Citations Over TimeTop 10% of 2008 papers

Abstract

Use of the extinct 182 Hf- 182 W chronometer to constrain the timing of planetary accretion and differentiation rests ontheassumptionthatthesolarnebulahadhomogeneoustungstenisotopiccomposition.Here,wereportdeficiencies of � 0.1 part in 10,000 in the abundance of 184 Win group IVB iron meteorites relative to the silicate Earth. These are mostlikelyduetoincompletemixingattheplanetesimalscale(2Y4kmradiusbodies)oftheproductsof slow(s-)and rapid (r-) neutron-capture nucleosynthesis in the solar nebula. The correction that must be applied to the 182 Hf- 182 W model age of core formation in IVB irons due to the presence of these nuclear anomalies is � 0.5 Myr. Subject headingg minor planets, asteroids — nuclear reactions, nucleosynthesis, abundances — solar system: formation — stars: abundances

Related Papers

• → Scattering of Planetesimals by a Protoplanet: Slowing Down of Runaway Growth(1993)373 cited
• → Planetesimal capture in the disk instability model(2006)65 cited
• → Distribution of Planetesimals around a Protoplanet in the Nebula Gas(1997)62 cited
• → Orbital evolution and accretion of protoplanets tidally interacting with a gas disk(2005)25 cited
• → Orbital evolution and accretion of protoplanets tidally interacting with a gas disk(2006)26 cited