129I and 247Cm in meteorites constrain the last astrophysical source of solar r-process elements

Côté, Benoit; Eichler, Marius; Yagüe, Andrés; Vassh, Nicole; Mumpower, Matthew R.; Világos, Blanka; Soós, Benjámin; Arcones, Almudena; Sprouse, Trevor M.; Surman, Rebecca; Pignatari, Marco; Pető, Mária K.; Wehmeyer, Benjamin; Rauscher, Thomas; Lugaro, Maria

Abstract

The composition of the early Solar System can be inferred from meteorites. Many elements heavier than iron were formed by the rapid neutron capture process (r-process), but the astrophysical sources where this occurred remain poorly understood. We demonstrate that the near-identical half-lives (−~15:6 million years) of the radioactive r-process nuclei iodine-129 and curium-247 preserve their ratio, irrespective of the time between production and incorporation into the Solar System. We constrain the last r-process source by comparing the measured meteoritic ratio 129I/247Cm = 438 ± 184 with nucleosynthesis calculations based on neutron star merger and magneto-rotational supernova simulations. Moderately neutron-rich conditions, often found in merger disk ejecta simulations, are most consistent with the meteoritic value. Uncertain nuclear physics data limit our confidence in this conclusion.

Citation

Côté, B., Eichler, M., Yagüe, A., Vassh, N., Mumpower, M. R., Világos, B., Soós, B., Arcones, A., Sprouse, T. M., Surman, R., Pignatari, M., Pető, M. K., Wehmeyer, B., Rauscher, T., & Lugaro, M. (2021). 129I and 247Cm in meteorites constrain the last astrophysical source of solar r-process elements. Science, 371(6532), 945-948. https://doi.org/10.1126/science.aba1111

• Journal Article Type: Article
• Acceptance Date: Jan 25, 2021
• Online Publication Date: Feb 26, 2021
• Publication Date: Feb 26, 2021
• Deposit Date: Dec 17, 2020
• Publicly Available Date: Mar 22, 2021
• Journal: Science
• Print ISSN: 0036-8075
• Publisher: American Association for the Advancement of Science
• Peer Reviewed: Peer Reviewed
• Volume: 371
• Issue: 6532
• Pages: 945-948
• DOI: https://doi.org/10.1126/science.aba1111
• Keywords: Solar and Stellar Astrophysics; High Energy Astrophysical Phenomena; Nuclear Theory
• Public URL: https://hull-repository.worktribe.com/output/3523740