Gravitational Wave Peep Contributions to Background Signal Confusion Noise for LISA

Abstract

Two-body gravitational interactions will occasionally lead to a stellar-mass compact object entering a very highly eccentric orbit around a massive black hole at the center of a galaxy. Gravitational radiation damping will subsequently result in an extreme mass ratio inspiral. Much of the inspiral time of these events is spent with the compact object on a long-period orbit, with a brief burst of gravitational wave emission at periapsis firmly in the mHz band. Burst orbits have been previously modeled as parabolic, with a focus on extreme examples that could be detectable by space-based gravitational wave detectors. This work focuses on the recurring bursts called ``peeps". Peeps are not likely to be individually resolvable; however, it is also important to consider them as possible sources of signal confusion noise because they do generate a signal within the LISA band with every pericenter passage. To account for peeps, we must utilize estimates for EMRI capture parameters along with tracking the massive black hole population out to a redshift of 3 using the Illustris Project. Then, this population is combined with an EMRI formation rate to estimate the number of EMRI events per unit volume for LISA. In this study, we model four different assumptions for the gravitational wave background produced by these highly eccentric peeps. We find that with our two most likely backgrounds, the signal may result in a slight rise of the LISA noise floor (SNR $\sim 0.3-2.4$); however, in two more abundant cases, the background generated by these sources would be detectable on their own and likely obscure many potentially detectable sources (SNR $\sim 77-145$).

14 pages, 9 figures

References in corpus (21)

• Array Programming with NumPy
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Properties of galaxies reproduced by a hydrodynamic simulation
• The Illustris simulation: the evolving population of black holes across cosmic time
• Using LISA EMRI sources to test off-Kerr deviations in the geometry of massive black holes
• FastEMRIWaveforms: New tools for millihertz gravitational-wave data analysis
• Rapid generation of fully relativistic extreme-mass-ratio-inspiral waveform templates for LISA data analysis
• Improved reconstruction of a stochastic gravitational wave background with LISA
• Characterization of the stochastic signal originating from compact binaries populations as measured by LISA
• LISA extreme-mass-ratio inspiral events as probes of the black hole mass function
• Gravitational wave bursts from the Galactic massive black hole
• Assessing the data-analysis impact of LISA orbit approximations using a GPU-accelerated response model
• Observing the Galaxy's massive black hole with gravitational wave bursts
• TDI-infinity: time-delay interferometry without delays
• Non-local parameter degeneracy in the intrinsic space of gravitational-wave signals from extreme-mass-ratio inspirals
• Relativistic Effects in Extreme Mass Ratio Gravitational Wave Bursts
• Extreme-mass-ratio burst detection with TianQin
• Gaussianity of LISA's confusion backgrounds
• Gravitational Wave Peeps from EMRIs and their Implication for LISA Signal Confusion Noise
• Gravitational Wave Peep Contributions to Background Signal Confusion Noise for LISA

Cited by in corpus (1)

• Gravitational Wave Peep Contributions to Background Signal Confusion Noise for LISA