Production of Heavy Elements during the Explosion of a Low-Mass Neutron Star in a Close Binary

Abstract

The nucleosynthesis of heavy elements in the scenario for the evolution of a close binary of neutron stars differing greatly in mass is considered. In contrast to the scenario for the merger of two neutron stars of comparable masses considered repeatedly in the literature, the evolution of such a binary at the final stage consists in a rapid mass transfer to the more massive star and an explosive disruption of the low-mass component. We provide the details of the explosion and calculate the abundances of the heavy elements produced in this process for various initial conditions.

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ACKNOWLEDGMENTS

We are grateful to S.I. Blinnikov and D.K. Nadyozhin for the discussion of physical processes at the final evolutionary stages of a NS binary and the equation of state for superdense matter and to N.I. Kramarev for his participation in the discussion and his interest in the work.

Funding

This work was supported by the Russian Foundation for Basic Research (project no. 18-29-21019 mk).

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Correspondence to I. V. Panov.

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Translated by V. Astakhov

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Panov, I.V., Yudin, A.V. Production of Heavy Elements during the Explosion of a Low-Mass Neutron Star in a Close Binary. Astron. Lett. 46, 518–527 (2020). https://doi.org/10.1134/S1063773720080034

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Keywords:

  • neutron stars
  • close binaries
  • nucleosynthesis
  • nuclear reactions
  • beta decay