AI Insight
This study examines how line-of-sight acceleration (LOSA) effects and orbital eccentricity in gravitational wave signals from merging compact binaries can be mistaken for one another during analysis. The researchers demonstrate that when both effects are properly modeled in waveform templates, they can be distinguished and accurately measured, as shown through simulations of a GW170817-like signal using next-generation detector sensitivity. They derive the frequency-domain phase correction for accelerating eccentric binaries and show that all parameters, including LOSA and eccentricity, can be recovered within 90% credible intervals when both effects are included in the model.
Why it matters
This work is crucial for accurately characterizing the environments surrounding merging compact binaries detected by gravitational wave observatories. Properly accounting for both LOSA and eccentricity will prevent misidentification of environmental effects and improve our understanding of where and how these cosmic collisions occur.
Understand the Science
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Abstract: The line-of-sight acceleration (LOSA) effect, imprinted in the gravitational wave (GW) signal of an inspiralling compact binary by an external gravitational potential, is one of the most promising means of probing the environment of compact binaries on a single-event basis. However, this effect is potentially degenerate with other low-frequency effects, particularly the binary’s orbital eccentricity. LOSA effects and orbital eccentricity can mimic each other if only one or the other (but not both) are accounted for in the waveform template. In this work, we present the (2, 2) mode, leading eccentric harmonic, frequency-domain phase correction incurred by an accelerating eccentric compact binary, and discuss inconsistencies pertaining to this phase correction in the literature. We show that the degeneracy between LOSA and orbital eccentricity can be resolved if both effects are modeled in the template. To demonstrate this, we inject a GW170817-like signal, with eccentricity and LOSA added to it, and recover the parameters of the injected signal assuming an A+ like noise power spectral density (PSD) of the LVK detector network. We find that the true LOSA and eccentricity parameters, along with other binary parameters, are recovered within the $90%$ credible interval (CI). This study highlights the importance of incorporating LOSA in eccentric waveform models to robustly and reliably estimate LOSA and eccentricity.
Source: Line-of-sight Acceleration Driven Effects in Eccentric Compact Binary Coalescences