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arXiv · 1710.06426

Improved constraints on H0 from a combined analysis of gravitational-wave and electromagnetic emission from GW170817

C. Guidorzi·R. Margutti·D. Brout·D. Scolnic·W. Fong·K. D. Alexander·P. S. Cowperthwaite·J. Annis·E. Berger·P. K. Blanchard·R. Chornock·D. L. Coppejans·T. Eftekhari·J. A. Frieman·D. Huterer·M. Nicholl·M. Soares-Santos·G. Terreran·V. A. Villar·P. K. G. Williams
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Abstract

The luminosity distance measurement of GW170817 derived from GW analysis in Abbott et al. 2017 (here, A17:H0) is highly correlated with the measured inclination of the NS-NS system. To improve the precision of the distance measurement, we attempt to constrain the inclination by modeling the broad-band X-ray-to-radio emission from GW170817, which is dominated by the interaction of the jet with the environment. We update our previous analysis and we consider the radio and X-ray data obtained at $t<40$ days since merger. We find that the afterglow emission from GW170817 is consistent with an off-axis relativistic jet with energy $10^{48}\,\rm{erg} 100$ days of the X-ray and radio emission will lead to tighter constraints.

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C. Guidorzi, R. Margutti, D. Brout, D. Scolnic, W. Fong, K. D. Alexander, P. S. Cowperthwaite, J. Annis, E. Berger, P. K. Blanchard, R. Chornock, D. L. Coppejans, T. Eftekhari, J. A. Frieman, D. Huterer, M. Nicholl, M. Soares-Santos, G. Terreran, V. A. Villar, P. K. G. Williams. 2017-10-17. Improved constraints on H0 from a combined analysis of gravitational-wave and electromagnetic emission from GW170817. https://doi.org/10.3847/2041-8213%2Faaa009

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