Blip glitches in Advanced LIGO data

Blip glitchesare short noise transients present in data from ground-based gravitational-wave observatories. These glitchesresemble the gravitational-wavesignature of massive binary black holemergers. Hence, the sensitivity of transient gravitational-wavesearches to such high-mass systems and other potential short duration sources is degraded by the presence of blip glitches. The origin and rate of occurrence of this type of glitchhave been largely unknown. In this paper we explore the population of blip glitchesin Advanced LIGOduring its first and second observing runs. On average, we find that Advanced LIGOdata contains approximately two blip glitchesper hour of data. We identify four subsets of blip glitchescorrelated with detector auxiliary or environmental sensor channels, however the physical causes of the majority of blips remain unclear.