Events Calendar
Radio Observations of Binary Neutron Star Mergers: Constraining Geometry, Energetics, Environment and Cosmology
Friday November 22, 2019
3:30 pm
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Presenter: | David Kaplan, UWM |
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Series: | Physics and Astronomy Colloquium | |
Abstract: |
I will discuss the major uncertainties regarding the geometry,
energetics, and environment of the first EM/GW binary neutron star merger GW170817. In particular I will look at the origin of the radio emission, how it differs from the early-time optical/infrared emission, and what that tells us about how the explosion proceeded. I will show how constraints from the radio lightcurve, polarization, and Very Long Baseline Interferometry helped provide evidence for a broad, mildly relativistic "cocoon" along with a narrow jet. This broke degeneracies in the gravitational wave data analysis to provide inclination constraints and improved measurements of the Hubble Constant. Finally, I will talk about new events from LIGO's latest observing run, and prospects for the future. |
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Host: | Gregory Taylor | |
Location: | PAIS-1100, PAIS | |