Could Failed Supernovae Explain the High r-process Abundances in Some Low Metallicity Stars?

JPS Conf. Proc. 31, 011063 (2020) [5 pages]

Proceedings of the 15th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG15)

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Benjamin Wehmeyer¹^,²^,*, Carla Fröhlich³, Benoit Côté¹^,⁷^,⁸, Marco Pignatari¹^,⁴^,⁷^,⁸, and Friedrich-Karl Thielemann⁵^,⁶

¹Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences Centre of Excellence, Konkoly-Thege Miklós út 15-17, H-1121 Budapest, Hungary

²Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, U.K.

³Department of Physics, North Carolina State University, 2401 Stinson Dr, Raleigh, NC 27695-8202, U.S.A.

⁴E.A. Milne Centre for Astrophysics, Dept. of Physics & Mathematics, University of Hull, HU6 7RX, U.K.

⁵Univ. Basel, Dept. Phys., Klingelbergstr. 82, CH-4056 Basel, Switzerland

⁶GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany

⁷Joint Institute for Nuclear Astrophysics - Center for the Evolution of the Elements

⁸NuGrid Collaboration, http://nugridstars.org

Received September 16, 2019

Rapid neutron capture process (r-process) elements have been detected in a large number of metal-poor halo stars. The observed large abundance scatter in these stars suggests that r-process elements have been produced in a site that is rare compared to core-collapse supernovae (CCSNe). Although being rare, neutron star mergers (NSM) alone have difficulties explaining the observations, especially at low metallicities. In this paper, we present a complementary scenario: Using black hole - neutron star mergers (BHNSMs) as additional r-process site. We show that both sites together are able to explain the observed r-process abundances in the Galaxy.

The Author(s)

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https://doi.org/10.7566/JPSCP.31.011063

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