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arXiv · 1906.07210

Early Solar System $r$-process Abundances Limit Collapsar Origin

Imre Bartos·Szabolcs Marka
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Abstract

Heavy elements produced exclusively through rapid neutron capture (the '$r$-process') originate from violent cosmic explosions. While neutron star mergers are the primary candidates, another plausible production site are 'collapsars'---collapsing massive stars that form a black hole with an accretion disk. Here we show that collapsars are too rare to be the prime origin of $r$-process elements in the Solar System. By comparing numerical simulations with the early Solar System abundances of actinides produced exclusively through the $r$-process, we exclude higher than 20% contribution from collapsars with 90% confidence. We additionally limit $r$-process ejecta masses from collapsars to less than 10% of the ejecta mass from neutron star mergers, about $10^{-2}$M$_\odot$.

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Imre Bartos, Szabolcs Marka. 2019-06-17. Early Solar System $r$-process Abundances Limit Collapsar Origin. https://doi.org/10.3847/2041-8213/ab3215

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