Early Solar System $r$-process Abundances Limit Collapsar Origin. (arXiv:1906.07210v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Bartos_I/0/1/0/all/0/1">Imre Bartos</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marka_S/0/1/0/all/0/1">Szabolcs Marka</a>
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$_odot$.
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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