  At 7.7 pc, the A-type star Fomalhaut hosts a bright debris disk with multiple
radial components. The disk is eccentric and misaligned, strongly suggesting
that it is sculpted by interaction with one or more planets. Compact sources
are now being detected with JWST, suggesting that new planet detections may be
imminent. However, to confirm such sources as companions, common proper motion
with the star must be established, as with unprecedented sensitivity comes a
high probability that planet candidates are actually background objects. Here,
ALMA and Keck observations of Fomalhaut are found to show significant emission
at the same sky location as multiple compact sources in JWST MIRI coronagraphic
observations, one of which has been dubbed the "Great Dust Cloud" because it
lies within the outer belt. Since the ground-based data were obtained between 6
to 18 years prior to the JWST observations, these compact sources are unlikely
to be common proper motion companions to Fomalhaut. More generally, this work
illustrates that images collected at a range of wavelengths can be valuable for
rejecting planet candidates uncovered via direct imaging with JWST.
