LIGO Document T2500220-v1

Investigations of Binary Neutron Star Range Oscillations at LIGO Livingston

Document #:
LIGO-T2500220-v1
Document type:
T - Technical notes
Other Versions:
Abstract:
The Laser Interferometer Gravitational Wave Observatory (LIGO) is composed of two interferometers that detect
gravitational waves from coalescing black hole and binary neutron star mergers. The binary neutron star inspiral
range (BNS) is a metric used to monitor detector sensitivity. Due to the extreme precision of the LIGO detectors, the BNS range must be carefully supervised for potential noise. This project focused on identifying and
characterizing the source of unusual noise that has been occurring since the start of the fourth observing run (O4).
In particular, the BNS range at the LIGO Livingston (LLO) detector frequently oscillates with a 30-minute period
that produces increased noise in the main gravitational wave data channel from 30 to 50 Hz. Many auxiliary sensors have also been exhibiting oscillations, making it difficult to understand the behavior and source of this noise. By generating band-limited root mean square plots, spectrograms, and using cross-correlation analysis for
many days across O4, we have seen that select temperature sensors, accelerometers, seismometers, and microphones are highly correlated with the gravitational wave strain. This suggests that the source of these oscillations could be physically located near one of these sensors.
Keywords:
SURF25
Referenced by:

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