3 years ago

On the Origin of Early Solar System Radioactivities: Problems with the Asymptotic Giant Branch and Massive Star Scenarios

Recent improvements in stellar models for intermediate-mass stars and massive stars (MSs) are recalled, together with their expectations for the synthesis of radioactive nuclei of lifetimes τ  ≲ 25 Myr, in order to re-examine the origins of now extinct radioactivities that were alive in the solar nebula. The Galactic inheritance broadly explains most of them, especially if r -process nuclei are produced by neutron star merging, according to recent models. Instead, 26 Al, 41 Ca, 135 Cs, and possibly 60 Fe require nucleosynthetic events close to the solar formation. We outline the persisting difficulties to account for these nuclei by intermediate-mass stars(2 ≲ M / M ⊙ ≲ 7–8). Models of their final stages now predict the ubiquitous formation of a 13 C reservoir as a neutron capture source; hence, even in the presence of 26 Al production from deep mixing or hot bottom burning, the ratio...

Publisher URL: http://iopscience.iop.org/0004-637X/863/2/115

DOI: 10.3847/1538-4357/aad191

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