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dc.contributor.authorIoka, Kunihito
dc.contributor.authorNakamura, Takashi
dc.contributor.alternative井岡, 邦仁
dc.contributor.alternative中村, 卓史
dc.description.abstractGravitational waves from a merger of two neutron stars (NSs) were discovered for the first time in GW170817, together with diverse electromagnetic (EM) counterparts. To make constraints on a relativistic jet from the NS merger, we calculate the EM signals in (1) the short gamma-ray burst sGRB 170817A from an off-axis jet, (2) the optical–infrared macronova (or kilonova), especially the blue macronova, from a jet-powered cocoon, and (3) the X-ray and radio afterglows from the interaction between the jet and interstellar medium. We find that a typical sGRB jet is consistent with these observations, and there is a parameter space to explain all the observations in a unified fashion with an isotropic energy ~ 10⁵¹ - 10⁵² erg, opening angle ~ 20°, and viewing angle ~ 30°. The off-axis emission is less de-beamed than the point-source case because the viewing angle is comparable to the opening angle. We also analytically show that the jet energy accelerates a fair fraction of the merger ejecta to a sub-relativistic velocity ~0.3 - 0.4c as a cocoon in a wide parameter range. The ambient density might be low ~ 10⁻³ - 10⁻⁶ cm⁻³, which can be tested by future observations of radio flares and X-ray remnants.
dc.publisherPhysical Society of Japan
dc.rights© The Author(s) 2018. Published by Oxford University Press on behalf of the Physical Society of Japan. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.titleCan an off-axis gamma-ray burst jet in GW170817 explain all the electromagnetic counterparts?
dc.type.niitypeJournal Article
dc.identifier.jtitleProgress of Theoretical and Experimental Physics
dc.addressCenter for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University
dc.addressenter for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University・JapanDepartment of Physics, Kyoto University
dc.identifier.kaken24103006 / 26287051 / 26247042 / 17H01126 / 17H06131 / 17H06362 / 17H06357
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