Multi-messenger Extended Emission from the Compact Remnant in GW170817

Journal
Date Issued
2019
Author(s)
van Putten, Maurice H. P. M.
•
•
Levinson, Amir
DOI
Abstract
GW170817/GRB 170817A probably marks a double neutron star (NS) coalescence. Extended emission {t}s≃ (0.67+/- 0.03) s post-merger shows an estimated energy output { \mathcal E }≃ (3.5+/- 1) % {M}☉ {c}2 determined by response curves to power-law signal injections, where c is the velocity of light. It provides calorimetric evidence for a rotating black hole of ∼ 3{M}☉ , inheriting the angular momentum J of the merged hyper-massive NS in the immediate aftermath of GW170817 following core-collapse about or prior to t s . Core-collapse greatly increases the central energy reservoir to {E}J≲ 1{M}☉ {c}2, accounting for { \mathcal E } even at modest efficiencies in radiating gravitational waves through a non-axisymmetric thick torus. The associated multi-messenger output in ultra-relativistic outflows and sub-relativistic mass-ejecta is consistent with observational constraints from the gamma-ray burst afterglow emission of GRB 170817A and accompanying kilonova.
Volume
876
Issue
1
Start page
L2
Uri
Url
Issn Identifier
2041-8205
Ads BibCode
2019ApJ...876L...2V
Rights
open.access
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