2010ApJ...725..443B

We propose a model for the incorporation of ¹⁰Be within calcium-aluminum inclusions (CAIs) in primitive carbonaceous meteorites. In this model, ¹⁰Be is produced by energetic particle reactions in the proto-solar atmosphere of a more active proto-Sun characterized by energetic particle fluxes higher than contemporary particle fluxes. This ¹⁰Be is incorporated into the solar wind that is then implanted into CAI precursor material. This production mechanism is operational in the contemporary solar system implanting ¹⁰Be in lunar materials. The contemporary production rate of ¹⁰Be at the surface of the Sun is ∼0.1 ¹⁰Be/cm2/s. Scaling up the contemporary ¹⁰Be production in the proto-Sun by a factor of 10⁵ would increase the production rate to 10^4 10^Be/cm2/s. Using this enhanced production value in conjunction with refractory mass inflow rates at 0.06 AU from the proto-Sun we model ¹⁰Be concentrations in CAI precursors. We calculate the content of solar-wind-implanted ¹⁰Be would have been of the order of 10^12 10^Be g^–1 in CAIs, consistent with initial¹⁰Be content found from boron-beryllium isotopic systematics in CAIs.