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The recent 'Planet Nine' hypothesis has led to many observational andarchival searches for this giant planet proposed to orbit the Sun at hundredsof astronomical units. While trans-Neptunian object searches are typicallyconducted in the optical, models suggest Planet Nine could be self-luminous andpotentially bright enough at ~3-5 microns to be detected by the Wide-fieldInfrared Survey Explorer (WISE). We have previously demonstrated a Planet Ninesearch methodology based on time-resolved WISE coadds, allowing us to detectmoving objects much fainter than would be possible using single-frameextractions. In the present work, we extend our 3.4 micron (W1) search to covermore than three quarters of the sky and incorporate four years of WISEobservations spanning a seven year time period. This represents the deepest andwidest-area WISE search for Planet Nine to date. We characterize the spatialvariation of our survey's sensitivity and rule out the presence of Planet Ninein the parameter space searched at W1 < 16.7 in high Galactic latitude regions(90% completeness).

A 3pi Search for Planet Nine at 3.4 microns with WISE and NEOWISE