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Swift and NuSTAR observations of GW170817: detection of a blue kilonova

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arxiv 1710.05437 v1 pith:6FFKRS5D submitted 2017-10-16 astro-ph.HE

classification astro-ph.HE
keywords detectionapprox0counterpartdirectgw170817nustarobservationsorbital
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

With the first direct detection of merging black holes in 2015, the era of gravitational wave (GW) astrophysics began. A complete picture of compact object mergers, however, requires the detection of an electromagnetic (EM) counterpart. We report ultraviolet (UV) and X-ray observations by Swift and the Nuclear Spectroscopic Telescope ARray (NuSTAR) of the EM counterpart of the binary neutron star merger GW170817. The bright, rapidly fading ultraviolet emission indicates a high mass ($\approx0.03$ solar masses) wind-driven outflow with moderate electron fraction ($Y_{e}\approx0.27$). Combined with the X-ray limits, we favor an observer viewing angle of $\approx 30^{\circ}$ away from the orbital rotation axis, which avoids both obscuration from the heaviest elements in the orbital plane and a direct view of any ultra-relativistic, highly collimated ejecta (a gamma-ray burst afterglow).

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Cited by 7 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. 3D Binary Neutron Star Merger Ejecta Evolution up to Seconds Timescale: Dynamics, Element Distribution, and Light Curves

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  5. Unequal Mass Binary Neutron Star Simulations with Neutrino Transport: Ejecta and Neutrino Emission

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    astro-ph.HE 2026-05 unverdicted novelty 5.0 of 10

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  7. Science Case for the Einstein Telescope

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