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  Fallback Accretion Halted by R-process Heating in Neutron Star Mergers and Gamma-Ray Bursts

Ishizaki, W., Kiuchi, K., Ioka, K., & Wanajo, S. (2021). Fallback Accretion Halted by R-process Heating in Neutron Star Mergers and Gamma-Ray Bursts. The Astrophysical Journal, 922(2): 185. doi:10.3847/1538-4357/ac23d9.

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2104.04708.pdf (Preprint), 2MB
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Ishizaki, Wataru, Author
Kiuchi, Kenta1, Author              
Ioka , Kunihito, Author
Wanajo, Shinya1, Author              
Affiliations:
1Computational Relativistic Astrophysics, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_2541714              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR
 Abstract: The gravitational wave event GW170817 with a macronova/kilonova shows that a merger of two neutron stars ejects matter with radioactivity including $r$-process nucleosynthesis. A part of the ejecta inevitably falls back to the central object, possibly powering long-lasting activities of a short gamma-ray burst (sGRB), such as extended and plateau emissions. We investigate the fallback accretion with the $r$-process heating by performing one-dimensional hydrodynamic simulations and developing a semi-analytical model. We show that the usual fallback rate $dM/dt \propto t^{-5/3}$ is halted by the heating because pressure gradients accelerate ejecta beyond an escape velocity. The suppression is steeper than Chevalier's power-law model through Bondi accretion within a turn-around radius. The characteristic halting timescale is $\sim 10^5$--$10^9$ sec for the GW170817-like $r$-process heating, which is long enough to continue the long-lasting emission of sGRBs. The halting timescale is sensitive to the uncertainty of the $r$-process. Future observation of fallback halting could constrain the $r$-process heating on the year scale.

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 Dates: 2021-04-102021-09-032021
 Publication Status: Published in print
 Pages: 22 pages, 15 figures
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 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2104.04708
DOI: 10.3847/1538-4357/ac23d9
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 922 (2) Sequence Number: 185 Start / End Page: - Identifier: -