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HEP: Interpreting GW170817 and the Electromagnetic Counterparts as a Short Gamma-Ray Burst

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Kunihito Ioka, Kyoto University
When
09 February 2018 from 2:00 PM to 3:00 PM
Where
339 Davey Lab
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Gravitational waves from a merger of two neutron stars (NSs) were discovered for the first time in GW170817, together with diverse electromagnetic (EM) counterparts. In this talk, we first discuss a relativistic jet from the NS merger viewed off-axis for explaining the short gamma-ray burst sGRB 170817A and the associated afterglows. Currently a typical sGRB jet is consistent with the EM observations. We also note that a different scenario with a chocked jet and the cocoon shock breakout is also consistent with the observations. This scenario requires the fast tail of the merger ejecta, which is produced at the onset of the merger. Next we discuss a possible contribution of energy from the jet and the central engine of the sGRB to the optical-infrared macronova (or kilonova). We can construct a model in which the energy source is the sGRB central engine, not the decay of r-process elements, allowing much broader parameter spaces, in particular smaller ejecta mass than the r-process model.

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