TY  - JOUR
A1  - Nedora, Vsevolod
A1  - Radice, David
A1  - Bernuzzi, Sebastiano
A1  - Perego, Albino
A1  - Daszuta, Boris
A1  - Endrizzi, Andrea
A1  - Prakash, Aviral
A1  - Schianchi, Federico
T1  - Dynamical ejecta synchrotron emission as a possible contributor to the changing behaviour of GRB170817A afterglow
JF  - Monthly notices of the Royal Astronomical Society
N2  - Over the past 3 yr, 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. 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-initio binary neutron star merger simulations. This provides a new avenue to constrain binary parameters. Specifically, we find that equal mass models with soft equations of state (EOSs) and high-mass ratio models with stiff EOSs are disfavoured as they typically predict afterglows that peak too early to explain the recent observations. Moderate stiffness and mass ratio models, instead, tend to be in good overall agreement with the data.
KW  - equation of state
KW  - gravitational waves
KW  - neutron star mergers
Y1  - 2021
U6  - https://doi.org/10.1093/mnras/stab2004
SN  - 0035-8711
SN  - 1365-2966
VL  - 506
IS  - 4
SP  - 5908
EP  - 5915
PB  - Oxford Univ. Press
CY  - Oxford
ER  -