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Searches are under way in Advanced LIGO and Virgo data for persistentgravitational waves from continuous sources, e.g. rapidly rotating galacticneutron stars, and stochastic sources, e.g. relic gravitational waves from theBig Bang or superposition of distant astrophysical events such as mergers ofblack holes or neutron stars. These searches can be degraded by the presence ofnarrow spectral artifacts (lines) due to instrumental or environmentaldisturbances. We describe a variety of methods used for finding, identifyingand mitigating these artifacts, illustrated with particular examples. Resultsare provided in the form of lists of line artifacts that can safely be treatedas non-astrophysical. Such lists are used to improve the efficiencies andsensitivities of continuous and stochastic gravitational wave searches byallowing vetoes of false outliers and permitting data cleaning.

physical review. d/physical review. d.

Identification and mitigation of narrow spectral artifacts that degrade  searches for persistent gravitational waves in the first two observing runs  of Advanced LIGO