2021
DOI: 10.1093/mnras/stab2004
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Dynamical ejecta synchrotron emission as a possible contributor to the changing behaviour of GRB170817A afterglow

Abstract: Over the past three years, the fading non-thermal emission from the GW170817 remained generally consistent with the afterglow powered by synchrotron radiation produced by the interaction of the structured jet with the ambient medium. Recent observations by Hajela et al. 2021 indicate the change in temporal and spectral behaviour in the X-ray band. We show that the new observations are compatible with the emergence of a new component due to non-thermal emission from the fast tail of the dynamical ejecta of ab-i… Show more

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Cited by 36 publications
(35 citation statements)
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“…Still, in the case of the 1.35-1.35M models, they predict masses of fast ejecta with M v 0.6c ej = 1.7 × 10 −6 and 3.3 × 10 −5 M for the DD2 and SFHo EoSs, respectively, which are about 50 and 5 times lower than those given in Table 2. Similarly, the recent calculations of Nedora et al (2021b) (see their Table 1) give masses about 90 and 5 times lower than our results for the fast ejecta of the DD2 and SFHo EoSs, respectively. These difference are likely to be connected to limitations in the affordable numerical resolution in both our SPH models as well as the grid-based models of Radice et al (2018a), such that details of the numerical methods have a strong impact.…”
Section: Comparison To Other Studiessupporting
confidence: 74%
“…Still, in the case of the 1.35-1.35M models, they predict masses of fast ejecta with M v 0.6c ej = 1.7 × 10 −6 and 3.3 × 10 −5 M for the DD2 and SFHo EoSs, respectively, which are about 50 and 5 times lower than those given in Table 2. Similarly, the recent calculations of Nedora et al (2021b) (see their Table 1) give masses about 90 and 5 times lower than our results for the fast ejecta of the DD2 and SFHo EoSs, respectively. These difference are likely to be connected to limitations in the affordable numerical resolution in both our SPH models as well as the grid-based models of Radice et al (2018a), such that details of the numerical methods have a strong impact.…”
Section: Comparison To Other Studiessupporting
confidence: 74%
“…A rather similar evolution of the heating rate is found for the SFHo-135135 model, and the asymmetric models. We note that the high-velocity tail is discussed as a possible source of the late-time synchrotron emission that was recently observed in GW170817 (Hajela et al 2021 ;Nedora et al 2021b ).…”
Section: A N G U L a R A N D V E L O C I T Y D E P E N D E N C E O F T H E E J E C Tamentioning
confidence: 55%
“…However, since neutrino sources do not switch on abruptly, a sharp preservation of the radiation front is not a critical modeling requirement for our applications. Being able to handle transport through fast moving media is, instead, critical for NS merger applications, since the outflows produced in these events can be mildly relativistic (𝑊 2) (Hotokezaka et al 2018;Nedora et al 2021a). This test demonstrates that THC_M1 meets this requirement.…”
Section: Optically Thin Advection Through a Velocity Jumpmentioning
confidence: 89%