Multiband gravitational-wave astronomy: Observing binary inspirals with a decihertz detector, B-DECIGO

Abstract

An evolving Japanese gravitational-wave (GW) mission in the deci-Hz band: B-DECIGO (DECihertz laser Interferometer Gravitational wave Observatory) will enable us to detect GW150914-like binary black holes, GW170817-like binary neutron stars, and intermediate-mass binary black holes out to cosmological distances. The B-DECIGO band slots in between the aLIGO-Virgo-KAGRA-IndIGO (hecto-Hz) and LISA (milli-Hz) bands for broader bandwidth; the sources described emit GWs for weeks to years across the multiband to accumulate high signal-to-noise ratios. This suggests the possibility that joint detection would greatly improve the parameter estimation of the binaries. We examine B-DECIGO's ability to measure binary parameters and assess to what extent multiband analysis could improve such measurement. Using non-precessing post-Newtonian waveforms with the Fisher matrix approach, we find for systems like GW150914 and GW170817 that B-DECIGO can measure the mass ratio to within < 0.1%, the individual black-hole spins to within < 10%, and the coalescence time to within < 5 s about a week before alerting aLIGO and electromagnetic facilities. Prior information from B-DECIGO for aLIGO can further reduce the uncertainty in the measurement of, e.g., certain neutron star tidally-induced deformations by factor of ∼ 6, and potentially determine the spin-induced neutron star quadrupole moment. Joint LISA and B-DECIGO measurement will also be able to recover the masses and spins of intermediate-mass binary black holes at percent-level precision. However, there will be a large systematic bias in these results due to post-Newtonian approximation of exact GW signals.

Modeling Dense Star Clusters in the Milky Way and Beyond with the CMC Cluster Catalog

“…In a typical cluster, "single-single capture mergers" constitute roughly 5% of all BBH mergers. All of the above dynamical channels produce BBHs with unique and potentially distinguishable properties that should, in principle, be detectable as GW sources by LIGO/Virgo, as well as lower frequency thirdgeneration GW detectors such as LISA (Amaro-Seoane et al 2017), DECIGO (Kawamura et al 2011;Isoyama et al 2018), and Tian Qin (Luo et al 2016). We list the total number of BBH mergers catalyzed by each of these channels in Table A5 in the Appendix.…”

Parametrized and inspiral-merger-ringdown consistency tests of gravity with multiband gravitational wave observations

“…In particular, this paper is a follow-up of [44], which studied two theory-agnostic ways of testing GR with GWs: (i) parameterized waveform tests [12,13,46], and (ii) inspiral-merger-ringdown (IMR) consistency tests [12,13,47,48]. We extend [44] by explaining our analysis in more detail and studying a variety of example theories of gravity, including 1 Multi-band GW observations are also possible for more massive binary BHs [33,34] and binary neutron stars [35].…”

Binary white dwarfs and decihertz gravitational wave observations: From the Hubble constant to supernova astrophysics

“…We show how, in a multi-messenger scenario, BWDs are a complementary and independent tool to measure H 0 and are able to provide new insights on the fundamental physics of the SN explosion. Gravitational signals are assumed to be observed by the Japanese decihertz interferometers DECIGO and B-DECIGO [22,57,58]. We focus on the constraints that these detectors will be able to put on the luminosity distance and on the Hubble constant, by exploiting the redshift inferred by the spectrum of SN or its host galaxy.…”