Chirping compact stars: gravitational radiation and detection degeneracy with binary systems A conceptual pathfinder for space-based gravitational-wave observatories

J. F. Rodriguez; J. A. Rueda; R. Ruffini; J. I. Zuluaga; J. M. Blanco-Iglesias; P. Loren-Aguilar

doi:10.1088/1475-7516/2023/10/017

paper

Chirping compact stars: gravitational radiation and detection degeneracy with binary systems A conceptual pathfinder for space-based gravitational-wave observatories

arXiv:1907.10532 · doi:10.1088/1475-7516/2023/10/017

Abstract

Compressible, Riemann S-type ellipsoids can emit gravitational waves (GWs) with a chirp-like behavior (hereafter chirping ellipsoids, CELs). We show that the GW frequency-amplitude evolution of CELs (mass $\sim 1$ ~M $_{⊙}$ , radius $\sim 1 0^{3}$ ~km, polytropic equation of state with index $n \approx 3$ ) is indistinguishable from that emitted by double white dwarfs (DWDs) and by extreme mass-ratio inspirals (EMRIs) composed of an intermediate-mass (e.g.~ $1 0^{3} M_{⊙}$ ) black hole and a planet-like (e.g.~ $1 0^{- 4} M_{⊙}$ ) companion, in a specific frequency interval within the detector sensitivity band in which the GWs of all these systems are quasi-monochromatic. We estimate that for reasonable astrophysical assumptions, the rates in the local Universe of CELs, DWDs and EMRIs in the mass range considered here, are very similar, posing a detection-degeneracy challenge for space-based GW detectors. The astrophysical implications of this CEL-binary detection degeneracy by space-based GW-detection facilities, are outlined.

arXiv commentPublished JCAP

Chirping compact stars: gravitational radiation and detection degeneracy with binary systems A conceptual pathfinder for space-based gravitational-wave observatories

Abstract

References in corpus (47)