Protostellar Cosmic Rays and Extinct Radioactivities in Meteorites

Details Protostellar Cosmic Rays and Extinct Radioactivities in Meteorites Protostellar Cosmic Rays and Extinct Radioactivities in Meteorites

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...506..898l&link_type=abstract

The Astrophysical Journal, Volume 506, Issue 2, pp. 898-912.

Astronomy and Astrophysics

Astronomy

131

Ism: Cosmic Rays, Meteors, Meteroroids, Nuclear Reactions, Nucleosynthesis, Abundances, Solar System: Formation, Sun: Particle Emission

Scientific paper

Calcium-aluminum-rich inclusions (CAIs) and chondrules of chondritic meteorites may originate with the melting of dustballs launched by a magnetically driven bipolar outflow from the inner edge of the primitive solar nebula. Bombardment by protostellar cosmic rays may make the rock precursors of CAIs and chondrules radioactive, producing radionuclides found in meteorites that are difficult to obtain with other mechanisms. Reasonable scalings from the observed hard X-rays for the cosmic-ray protons released by flares in young stellar objects yield the correct amounts of ^41Ca, ^53Mn, and ^138La inferred for meteorites, but proton- and alpha-induced transformations underproduce ^26Al by a factor of about 20. The missing ^26Al may be synthesized by ^3He nuclei accelerated in impulsive flares reacting primarily with ^24Mg, an abundant isotope in the target precursor rocks. The mechanism allows a simple explanation for the very different ratios of ^26Al/^27Al inferred for normal CAIs, CAIs with fractionated and unidentified nuclear (FUN) anomalies, and chondrules. The overproduction of ^41Ca by analogous ^3He reactions and the case of ^60Fe inferred for eucritic meteorites require special interpretations in this picture.

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