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• W2921880212 endingPage "5776" @default.
• W2921880212 startingPage "5773" @default.
• W2921880212 abstract "GRB 170817A, detected by Fermi Gamma-ray Burst Monitor 1.7 s after the merger of a neutron star (NS) binary, provides the first direct evidence for a link between such a merger and a short-duration gamma-ray burst. The X-ray observations after GRB 170817A indicate a possible X-ray flare with a peak luminosity |$L_{rm peak} sim 2times 10^{39}, {rm erg, s}^{-1}$| near day 156. Here we show that this X-ray flare may be understood based on a slim disc around a compact object. On the one hand, there exists the maximal accretion rate |$dot{M}_{rm max}$| for the slim disc, above which an optically thick outflow is significant and radiation from the disc is obscured. Based on the energy balance analysis, we find that |$dot{M}_{rm max}$| is in the range of |${sim } 4dot{M}_{rm Edd}$| and |${sim } 21dot{M}_{rm Edd}$| when the angular velocity of the slim disc is between |$rm (1/5)^{1/2}Omega _K$| and |$rm Omega _K$| (where |$dot{M}_{rm Edd}$| is the Eddington accretion rate and ΩK is the Keplerian angular velocity). With |$dot{M}_{rm max}$|⁠, the slim disc can provide a luminosity ∼Lpeak for a compact object of |$2.5 , mathrm{M}_{odot }$|⁠. On the other hand, if the merger of two NSs forms a typical neutrino-dominated accretion disc whose accretion rate |$dot{M}$| follows a power-law decline with an index −1.8, then the system must pass through the outflow regime and enter the slim disc in ∼11–355 d. These results imply that a post-merger slim accretion disc could account for the observed late-time Lpeak." @default.
• W2921880212 created "2019-03-22" @default.
• W2921880212 creator A5037376616 @default.
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• W2921880212 date "2019-03-27" @default.
• W2921880212 modified "2023-10-10" @default.
• W2921880212 title "Could an X-ray flare after GRB 170817A originate from a post-merger slim accretion disc?" @default.
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• W2921880212 doi "https://doi.org/10.1093/mnras/stz840" @default.
• W2921880212 hasPublicationYear "2019" @default.
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