Energetic Constraints on In Situ Production of Short-Lived Radionuclei in the Early Solar System

Details Energetic Constraints on In Situ Production of Short-Lived Radionuclei in the Early Solar System Energetic Constraints on In Situ Production of Short-Lived Radionuclei in the Early Solar System

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...671l..69d&link_type=abstract

The Astrophysical Journal, Volume 671, Issue 1, pp. L69-L72.

Astronomy and Astrophysics

Astronomy

18

Nuclear Reactions, Nucleosynthesis, Abundances, Solar System: Formation, Stars: Formation

Scientific paper

We calculate upper limits on the amount of short-lived radionuclei that can be produced by nonthermal nucleosynthesis in the early solar system. Using energetic constraints obtained from X-ray observations of young stellar objects, we show that irradiation of bare solids can produce 10Be and 41Ca at levels compatible with a homogeneous distribution over the entire protoplanetary disk up to the comet-forming region. 53Mn and 36Cl cannot be produced at canonical levels together with 10Be and 41Ca, unless we posit a heterogeneous spatial distribution. The high level of 7Be suggested recently is barely compatible with a coproduction of 10Be up to the cometary reservoir and may indicate the irradiation of a gas phase. Finally, we show that the maximum amount of irradiation-induced 26Al can only account for a homogeneous distribution of this radionuclide over a rocky reservoir of 2-3 M⊕ and that the well-defined canonical 26Al/27Al ratio observed in Ca-Al-rich inclusions is probably not compatible with an in situ production in the embedded phase of the Sun. If extinct 26Al is detected in the cometary material from the Stardust mission, the nucleosynthetic process that produced this preeminent high-resolution chronometer should be searched for in stellar events contemporary with the birth of the Sun.

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