Opportunistic search for continuous gravitational waves from compact objects in long-period binaries

Abstract

Most all-sky searches for continuous gravitational waves assume the source to be isolated. In this paper, we allow for an unknown companion object in a long-period orbit and opportunistically use previous results from an all-sky search for isolated sources to constrain the continuous gravitational wave amplitude over a large and unexplored range of binary orbital parameters without explicitly performing a dedicated search for binary systems. The resulting limits are significantly more constraining than any existing upper limit for unknown binary systems, albeit the latter apply to different orbital parameter ranges that are computationally much costlier to explore.

4 pages, 4 figures, v1: initial submit, v2: correction in figure 4, v3: submitted to ApJ, v4: final accepted version, v5: published version (ApJ)

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• Continuous gravitational waves from Galactic neutron stars: demography, detectability and prospects
• Search for continuous gravitational wave signals from luminous dark photon superradiance clouds with LVK O3 observations
• Search for continuous gravitational waves from unknown neutron stars in binary systems with long orbital periods in O3 data
• Results from an Einstein@Home search for continuous gravitational waves from Cassiopeia A and Vela Jr. using LIGO O2 data