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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

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

P.A. Evans , S.B. Cenko , J.A. Kennea , S.W.K. Emery , N.P.M. Kuin , O. Korobkin , R.T. Wollaeger , C.L. Fryer
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K.K. Madsen F.A. Harrison Y. Xu E. Nakar K. Hotokezaka A. Lien S. Campana S.R. Oates E. Troja A.A. Breeveld F. E. Marshall S.D. Barthelmy A. P. Beardmore D.N. Burrows G. Cusumano A. D'Ai P. D'Avanzo V. D'Elia M. de Pasquale W.P. Even C.J. Fontes K. Forster J. Garcia P. Giommi B. Grefenstette C. Gronwall D.H. Hartmann M. Heida A.L. Hungerford M.M. Kasliwal H.A. Krimm A.J. Levan D. Malesani A. Melandri H. Miyasaka J.A. Nousek P.T. O'Brien J.P. Osborne C. Pagani K.L. Page D.M. Palmer M. Perri S. Pike J.L. Racusin S. Rosswog M.H. Siegel T. Sakamoto B. Sbarufatti G. Tagliaferri N.R. Tanvir A. Tohuvavohu
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keywords detectionapprox0counterpartdirectgw170817nustarobservationsorbital
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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 4 Pith papers

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

  1. Rapid and robust simulation-based inference for kilonovae

    astro-ph.IM 2026-05 unverdicted novelty 6.0

    Simulation-based inference with a Gaussian process emulator trained on ~1300 POSSIS simulations enables rapid, robust kilonova parameter estimation that avoids MCMC biases from likelihood misspecification.

  2. Rapid and robust simulation-based inference for kilonovae

    astro-ph.IM 2026-05 unverdicted novelty 6.0

    A simulation-based inference method with Gaussian process emulators trained on 1300 kilonova simulations recovers parameters accurately and rapidly while avoiding MCMC biases from likelihood misspecification.

  3. Magnetic Eruption and Nucleosynthesis in GR{\nu}MHD Simulations of Spinning Neutron Star Mergers

    astro-ph.HE 2026-05 unverdicted novelty 5.0

    3D GRMHD simulations with second-moment neutrino transport show aligned spins produce more collimated polar outflows and 2.4e-3 solar masses of proton-rich material yielding light r-process elements like 56Ni, while a...

  4. Science Case for the Einstein Telescope

    astro-ph.CO 2019-12 unverdicted novelty 3.0

    The Einstein Telescope will enable gravitational-wave observations up to cosmological distances, opening avenues for discoveries in astrophysics, cosmology, and fundamental physics.