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Astronomy Colloquium - "Electromagnetic counterparts to GW170817 and astrophysical implications"

Event Type
Seminar/Symposium
Sponsor
Astronomy Department
Location
134 Astronomy
Date
Dec 11, 2018   3:45 pm  
Speaker
Kenta Hotokezaka, Princeton University
Contact
Rebecca Bare
E-Mail
rsbare@illinois.edu
Phone
217-265-8226
Views
20
Originating Calendar
Astronomy Colloquium Speaker Calendar
The neutron star merger GW170817 is the first gravitational-wave (GW) event
accompanied by electromagnetic radiation: prompt gamma-rays, uv/optical/IR kilonova, and broadband non-thermal afterglow. The signatures of kilonova in GW170817 are consistent with the picture that a substantial amount of material is ejected at merger and the ejecta is  composed of  r-process nuclei. In particular, the light curve from 0.5 to 70 days after the merger can be explained well with the radioactive power of r-process nuclei. I will discuss what we can learn from this observation about the composition of the ejecta and also discuss the nebular emission of kilonvoae. The second part of my talk, I will focus on the superluminal jet in GW170817 observed by VLBI. Using the afterglow light curve data and VLBI images, the jet's Lorentz factor, kinetic energy, and viewing angle are determined. I will discuss the implication of this jet  to short gamma-ray bursts and how these observations can improve the GW distance measurement, which leads to the improvement of the local Hubble constant measurement from the GW-only analysis.

 

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