GW170817: The Energy Extraction Process of the Off-axis Relativistic Outflow and the Constraint on the Equation of State of Neutron Stars

As revealed recently by the modeling of the multiwavelength data of the emission following GW170817/GRB 170817A, there was an off-axis energetic relativistic outflow component launched by this historic double neutron star merger event. In this work we use the results of this model to examine the ene...

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Bibliographic Details
Published in:The Astrophysical journal 2019-05, Vol.877 (1), p.2
Main Authors: Wang, Yuan-Zhu, Shao, Dong-Sheng, Jiang, Jin-Liang, Tang, Shao-Peng, Ren, Xiao-Xiao, Zhang, Fu-Wen, Jin, Zhi-Ping, Fan, Yi-Zhong, Wei, Da-Ming
Format: Article
Language:English
Subjects:
Accretion disks
Astrophysics
binaries: close
Equations of state
gamma-ray burst: individual (GRB 170817A)
gravitational waves
Mass distribution
Neutrinos
Neutron stars
Neutrons
Outflow
Relativism
Relativistic effects
Star mergers
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Summary:As revealed recently by the modeling of the multiwavelength data of the emission following GW170817/GRB 170817A, there was an off-axis energetic relativistic outflow component launched by this historic double neutron star merger event. In this work we use the results of this model to examine the energy extraction process of the central engine. We show that the magnetic process (i.e., the Blandford-Znajek mechanism) is favored, while the neutrino process usually requires an accretion disk that is too massive if the duration of the central engine activity Tact is comparable to the observed T90 of GRB 170817A. If Tact is less than ∼0.2 s, the two models are indistinguishable. We propose that the GRB observations are helpful to constrain the combined tidal parameter , and by adopting the accretion disk mass distribution estimated in the BZ mechanism, the 90% credible interval of for the progenitor of GW170817 is inferred as 309 − 954.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab1914