Afterglow light curves of the non-relativistic ejecta mass in a stratified circumstellar medium

N. Fraija; B. Betancourt Kamenetskaia; M. G. Dainotti; R. Barniol Duran; A. Gálvan Gámez; S. Dichiara; Pedreira A. C. Caligula do E. S

doi:10.3847/1538-4357/abcaf6

paper

Afterglow light curves of the non-relativistic ejecta mass in a stratified circumstellar medium

arXiv:2006.04049 · doi:10.3847/1538-4357/abcaf6

Abstract

We present the afterglow light curves produced by the deceleration of the non-relativistic ejecta mass in a stratified circumstellar medium with a density profile $n (r) \propto r^{- k}$ with $k = 0$ , $1$ , $1.5$ , $2$ and $2.5$ . Once the ejecta mass is launched with equivalent kinetic energy parametrized by $E (> β) \propto β^{- α}$ (where beta is the ejecta velocity) and propagates into the surrounding circumstellar medium, it first moves with constant velocity (the free-coasting phase), and later it decelerates (the Sedov-Taylor expansion). We present the predicted synchrotron and synchrotron-self Compton light curves during the free-coasting phase, and the subsequent Sedov-Taylor expansion. In particular cases, we show the corresponding light curves generated by the deceleration of several ejecta masses with different velocities launched during the coalescence of binary compact objects and the core-collapse of dying massive stars which will contribute at distinct timescales, frequencies, and intensities. Finally, using the multi-wavelength observations and upper limits collected by a large campaign of orbiting satellites and ground telescopes, we constrain the parameter space of both the KN afterglow in GW170817 and the possibly generated KN afterglow in S190814bv. Further observations on timescales of years post-merger are needed to derive tighter constraints.

arXiv comment30 pages, 11 figures. Accepted for publication in ApJ. The synchrotron break frequencies in the self-absorption regime were added

Afterglow light curves of the non-relativistic ejecta mass in a stratified circumstellar medium

Abstract

References in corpus (154)

Cited by in corpus (8)