Evaluating KAGRA upgrade scenarios for multimessenger observations of binary neutron stars
Abstract
Binary neutron star mergers are key targets for multimessenger astronomy, motivating future upgrades of gravitational-wave detectors. For KAGRA, both broadband sensitivity improvements that increase the binary neutron star detection range, and high-frequency optimizations targeting neutron-star physics are under consideration. We present a computationally efficient framework to evaluate the multimessenger performance of detector upgrades by combining Fisher-matrix estimates of localization area and localization volume with detector duty factors and binary neutron star merger rates. We apply this framework to proposed KAGRA upgrade scenarios within the LIGO-Virgo-KAGRA network. For identical sources, the high-frequency upgrade improves sky localization by about 20% compared with the broadband option. However, when detection rates are taken into account, the broadband upgrade yields a larger number of well-localized events. Despite its shorter binary neutron star range than the other detectors, the inclusion of KAGRA increases the number of events localized within 103 Mpc3 volume by about 60%. These results provide a quantitative framework for evaluating future detector upgrades from the perspective of multimessenger observations.
Versions
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BibTeX
@misc{michimura2026evaluating,
title = {{Evaluating KAGRA upgrade scenarios for multimessenger observations of binary neutron stars}},
author = {Yuta Michimura and Soichiro Morisaki and Kenta Hotokezaka and Masaomi Tanaka},
howpublished = {arXiv},
year = {2026},
month = jul,
doi = {10.48550/arxiv.2607.12769},
eprint = {2607.12769},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.12769},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Evaluating KAGRA upgrade scenarios for multimessenger observations of binary neutron stars
AU - Yuta Michimura
AU - Soichiro Morisaki
AU - Kenta Hotokezaka
AU - Masaomi Tanaka
PY - 2026
DA - 2026/07/14
PB - arXiv
DO - 10.48550/arxiv.2607.12769
UR - https://arxiv.org/abs/2607.12769
AB - Binary neutron star mergers are key targets for multimessenger astronomy, motivating future upgrades of gravitational-wave detectors. For KAGRA, both broadband sensitivity improvements that increase the binary neutron star detection range, and high-frequency optimizations targeting neutron-star physics are under consideration. We present a computationally efficient framework to evaluate the multimessenger performance of detector upgrades by combining Fisher-matrix estimates of localization area and localization volume with detector duty factors and binary neutron star merger rates. We apply this framework to proposed KAGRA upgrade scenarios within the LIGO-Virgo-KAGRA network. For identical sources, the high-frequency upgrade improves sky localization by about 20% compared with the broadband option. However, when detection rates are taken into account, the broadband upgrade yields a larger number of well-localized events. Despite its shorter binary neutron star range than the other detectors, the inclusion of KAGRA increases the number of events localized within 10^3 Mpc^3 volume by about 60%. These results provide a quantitative framework for evaluating future detector upgrades from the perspective of multimessenger observations.
ER -