The late afterglow of GW170817/GRB170817A: a large viewing angle and the shift of the Hubble constant to a value more consistent with the local measurements

Abstract

The multi-messenger data of neutron star merger events are promising for constraining the Hubble constant. So far, GW170817 is still the unique gravitational wave event with multi-wavelength electromagnetic counterparts. In particular, its radio and X-ray emission have been measured in the past $\sim 3-5$ years. In this work, we fit the long-lasting X-ray, optical, and radio afterglow light curves of GW170817/GRB 170817A, including the forward shock radiation from both the decelerating relativistic GRB outflow and the sub-relativistic kilonova outflow (though whether the second component contributes significantly is still uncertain), and find out a relatively large viewing angle ($\sim 0.5\mathrm{rad}$). Such a viewing angle has been taken as a prior in the gravitational wave data analysis, and the degeneracy between the viewing angle and the luminosity distance is broken. Finally, we have a Hubble constant $H_0=72.57_{-4.17}^{+4.09}\mathrm{km}{\mathrm{s}}^{-1}\mathrm{Mp}{\mathrm{c}}^{-1}$, which is more consistent with that obtained by other local measurements. If rather similar values are inferred from multi-messenger data of future neutron star merger events, it will provide critical support to the existence of the Hubble tension.

12 pages, 5 figures, and 2 tables. Accepted for publication in ApJ

References in corpus (18)

• Multi-messenger Observations of a Binary Neutron Star Merger
• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• A gravitational-wave standard siren measurement of the Hubble constant
• The X-ray counterpart to the gravitational wave event GW 170817
• A Radio Counterpart to a Neutron Star Merger
• On the Hubble constant tension in the SNe Ia Pantheon sample
• On the evolution of the Hubble constant with the SNe Ia Pantheon Sample and Baryon Acoustic Oscillations: a feasibility study for GRB-cosmology in 2030
• The optical afterglow of GW170817 at one year post-merger
• A thousand days after the merger: continued X-ray emission from GW170817
• Evidence for X-ray Emission in Excess to the Jet Afterglow Decay 3.5 yrs After the Binary Neutron Star Merger GW 170817: A New Emission Component
• 3D magnetised jet break-out from neutron-star binary merger ejecta: afterglow emission from the jet and the ejecta
• Observable Features of GW170817 Kilonova Afterglow
• Dynamical ejecta synchrotron emission as possible contributor to the changing behaviour of GRB170817A
• On the diversity of magnetar-driven kilonovae
• Prospects for multi-messenger detection of binary neutron star mergers in the fourth LIGO-Virgo-KAGRA observing run
• Multimessenger parameter estimation of GW170817: from jet structure to the Hubble constant
• Prospects of calibrating afterglow modeling of short GRBs with gravitational wave inclination angle measurements and resolving the Hubble tension with a GW-GRB association event
• Late afterglow emission statistics: a clear link between GW170817 and bright short GRBs

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