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Title: Jet Dynamics in Compact Object Mergers: GW170817 Likely Had a Successful Jet

Abstract

Here, we use relativistic hydrodynamic numerical calculations to study the interaction between a jet and a homologous outflow produced dynamically during binary neutron star mergers. We quantify how the thermal energy imparted by the jet and the ability of the jet to escape the ejecta depend on the parameters of the jet engine and the ejecta. Under our assumptions, a collimated jet initiated at early times compared to the engine duration, we show that successful breakout of the forward cocoon shock necessitates a jet that successfully escapes the ejecta. This is because the ejecta is expanding, and the forward shock from a failed jet stalls before it reaches the edge of the ejecta. This conclusion can be circumvented only for very energetic wide angle jets, with parameters that are uncomfortable given short-duration GRB observations. For successful jets, we find two regimes of jet breakout from the ejecta: early breakout on timescales shorter than the engine duration, and late breakout well after the engine shuts off. A late breakout can explain the observed delay between gravitational waves and gamma rays in GW170817. We show that for the entire parameter space of jet parameters surveyed here (covering energies ~1048–1051 erg and openingmore » angles θ j ~ 0.07–0.4) the thermal energy deposited by the jet is less than that produced by r-process heating on second timescales by at least an order of magnitude. Shock heating is thus energetically subdominant in setting the luminosity of thermally powered transients coincident with neutron star mergers (kilonovae).« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1]
  1. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Krell Institute, Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Gordon and Betty Moore Foundation
OSTI Identifier:
1610354
Grant/Contract Number:  
FG02-97ER25308; GBMF5076
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 866; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; astronomy & astrophysics; gamma-ray burst; gravitational waves; hydrodynamics; ISM; jets and outflows; relativistic processes; shock waves

Citation Formats

Duffell, Paul C., Quataert, Eliot, Kasen, Daniel, and Klion, Hannah. Jet Dynamics in Compact Object Mergers: GW170817 Likely Had a Successful Jet. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aae084.
Duffell, Paul C., Quataert, Eliot, Kasen, Daniel, & Klion, Hannah. Jet Dynamics in Compact Object Mergers: GW170817 Likely Had a Successful Jet. United States. https://doi.org/10.3847/1538-4357/aae084
Duffell, Paul C., Quataert, Eliot, Kasen, Daniel, and Klion, Hannah. Fri . "Jet Dynamics in Compact Object Mergers: GW170817 Likely Had a Successful Jet". United States. https://doi.org/10.3847/1538-4357/aae084. https://www.osti.gov/servlets/purl/1610354.
@article{osti_1610354,
title = {Jet Dynamics in Compact Object Mergers: GW170817 Likely Had a Successful Jet},
author = {Duffell, Paul C. and Quataert, Eliot and Kasen, Daniel and Klion, Hannah},
abstractNote = {Here, we use relativistic hydrodynamic numerical calculations to study the interaction between a jet and a homologous outflow produced dynamically during binary neutron star mergers. We quantify how the thermal energy imparted by the jet and the ability of the jet to escape the ejecta depend on the parameters of the jet engine and the ejecta. Under our assumptions, a collimated jet initiated at early times compared to the engine duration, we show that successful breakout of the forward cocoon shock necessitates a jet that successfully escapes the ejecta. This is because the ejecta is expanding, and the forward shock from a failed jet stalls before it reaches the edge of the ejecta. This conclusion can be circumvented only for very energetic wide angle jets, with parameters that are uncomfortable given short-duration GRB observations. For successful jets, we find two regimes of jet breakout from the ejecta: early breakout on timescales shorter than the engine duration, and late breakout well after the engine shuts off. A late breakout can explain the observed delay between gravitational waves and gamma rays in GW170817. We show that for the entire parameter space of jet parameters surveyed here (covering energies ~1048–1051 erg and opening angles θ j ~ 0.07–0.4) the thermal energy deposited by the jet is less than that produced by r-process heating on second timescales by at least an order of magnitude. Shock heating is thus energetically subdominant in setting the luminosity of thermally powered transients coincident with neutron star mergers (kilonovae).},
doi = {10.3847/1538-4357/aae084},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 866,
place = {United States},
year = {Fri Oct 05 00:00:00 EDT 2018},
month = {Fri Oct 05 00:00:00 EDT 2018}
}

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Works referencing / citing this record:

A lesson from GW170817: most neutron star mergers result in tightly collimated successful GRB jets
journal, November 2018

  • Beniamini, Paz; Petropoulou, Maria; Barniol Duran, Rodolfo
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Spiral-wave Wind for the Blue Kilonova
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An unusual transient following the short GRB 071227
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Kilonovae
journal, December 2019


A Radio Source Coincident with the Superluminous Supernova PTF10hgi: Evidence for a Central Engine and an Analog of the Repeating FRB 121102?
journal, April 2019


A lesson from GW170817: most neutron star mergers result in tightly collimated successful GRB jets
text, January 2018


Kilonovae
journal, December 2019


Short Duration Gamma-Ray Bursts and Their Outflows in Light of GW170817
journal, November 2020


Plug Disintegration in GRB Jet Eruption
text, January 2022