RT Journal Article
T1 Mapping the Universe Expansion: Enabling Percent-level Measurements of the Hubble Constant with a Single Binary Neutron-star Merger Detection
A1 Calderón Bustillo, Juan
A1 Leong, Samson H. W.
A1 Dietrich, Tim
A1 Lasky, Paul D.
AB The joint observation of the gravitational-wave (GW) and electromagnetic (EM) signal from the binary neutron-star merger GW170817 allowed for a new independent measurement of the Hubble constant H0, albeit with an uncertainty of about 15% at 1σ. Observations of similar sources with a network of future detectors will allow for more precise measurements of H0. These, however, are currently largely limited by the intrinsic degeneracy between the luminosity distance and the inclination of the source in the GW signal. We show that the higher-order modes in gravitational waves can be used to break this degeneracy in astrophysical parameter estimation in both the inspiral and post-merger phases of a neutron star merger. We show that for systems at distances similar to GW170817, this method enables percent-level measurements of H0 with a single detection. This would permit the study of time variations and spatial anisotropies of H0 with unprecedented precision. We investigate how different network configurations affect measurements of H0, and discuss the implications in terms of science drivers for the proposed 2.5- and third-generation GW detectors. Finally, we show that the precision of H0 measured with these future observatories will be solely limited by redshift measurements of EM counterparts.
PB American Astronomical Society | IOP Publishing
YR 2021
FD 2021-04-30
LK https://hdl.handle.net/10347/45833
UL https://hdl.handle.net/10347/45833
LA eng
NO Juan Calderón Bustillo et al 2021 ApJL 912 L10
NO This is the Accepted Manuscript version of an article accepted for publication in The Astrophysical Journal Letters.  IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it.  The Version of Record is available online at https://doi.org/10.3847/2041-8213/abf502
NO J.C.B. acknowledges support by the Australian Research Council (ARC) Discovery Project DP180103155 and the Direct Grant, Project 4053406, from the Research Committee of the Chinese University of Hong Kong. The project that gave rise to these results also received the support of a fellowship from the “la Caixa” Foundation (ID 100010434) and from the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No. 847648. The fellowship code is LCF/BQ/PI20/11760016. P.D.L. is supported through ARC Future Fellowship FT160100112, ARC Discovery Project DP180103155, and ARC Centre of Excellence CE170100004. The authors acknowledge computational resources provided by the LIGO Laboratory and supported by National Science Foundation Grants PHY-0757058 and PHY0823459; and the support of the NSF CIT cluster for the provision of computational resources for our parameter inference runs, and the support of the CUHK Central High Performance Computing Cluster, on which our runs using Parallel Bilby were performed. Part of the work described in this paper was supported by a grant from the Croucher Foundation of Hong Kong. This document has LIGO DCC number LIGO-P2000160.
DS Minerva
RD 25 may 2026