The White Dwarf -- White Dwarf galactic background in the LISA data
Jeffrey A. Edlund, Massimo Tinto, Andrzej Krolak, and Gijs Nelemans

TL;DR
This paper models the galactic white-dwarf binary background in LISA data, showing it varies periodically and can reveal properties of white-dwarf populations through spectral analysis.
Contribution
It introduces a novel approach using cyclostationary process theory to analyze the time-varying white-dwarf background in LISA data.
Findings
White-dwarf background amplitude modulates annually.
LISA can infer white-dwarf distribution properties.
Background behaves as a cyclostationary process.
Abstract
LISA (Laser Interferometer Space Antenna) is a proposed space mission, which will use coherent laser beams exchanged between three remote spacecraft to detect and study low-frequency cosmic gravitational radiation. In the low-part of its frequency band, the LISA strain sensitivity will be dominated by the incoherent superposition of hundreds of millions of gravitational wave signals radiated by inspiraling white-dwarf binaries present in our own galaxy. In order to estimate the magnitude of the LISA response to this background, we have simulated a synthesized population that recently appeared in the literature. We find the amplitude of the galactic white-dwarf binary background in the LISA data to be modulated in time, reaching a minimum equal to about twice that of the LISA noise for a period of about two months around the time when the Sun-LISA direction is roughly oriented towards…
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