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The Link Between the Local Bubble and Radioisotopic Signatures on Earth

Feige, J.; Breitschwerdt, D.; Wallner, A.; Schulreich, M. M.; Kinoshita, N.; Paul, M.; Dettbarn, C.; Fifield, K. L.; Golser, R.; Honda, M.; Linnemann, U.; Matsuzaki, H.; Merchel, S.; Rugel, G.; Steier, P.; Tims, S. G.; Winkler, S. R.; Yamagata, T.

Abstract

Traces of 2-3 Myr old 60Fe were recently discovered in a manganese crust and in lunar samples. We have found that this signal is extended in time and is present in globally distributed deep-sea archives. A second 6.5-8.7 Myr old signature was revealed in a manganese crust. The existence of the Local Bubble hints to a recent nearby supernova-activity starting 13 Myr ago. With analytical and numerical models generating the Local Bubble, we explain the younger 60Fe-signature and thus link the evolution of the solar neighborhood to terrestrial anomalies.

Keywords: supernova; AMS; radionuclide; local bubble; deep-sea samples; interstellar medium; accelerator mass spectrometry

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    14th International Symposium on Nuclei in the Cosmos XIV, 19.-24.06.2016, Toki Messe, Niigata, Japan
    Proceedings of the 14th International Symposium on Nuclei in the Cosmos XIV, JPS Conf. Proc. 14 (2017): JPS (Japan Physical Society) Conference Proceeding, 010304
    DOI: 10.7566/JPSCP.14.010304

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