  We report on a search for low mass companions within 10 AU of the star
Fomalhaut, using narrow band observations at 4.05 microns obtained with the
Apodizing Phase Plate (APP) coronagraph on the VLT/NaCo. Our observations place
a model dependent upper mass limit of 12-20 Jupiter masses from 4 to 10 AU,
covering the semi-major axis search space between interferometric imaging
measurements and other direct imaging non-detections. These observations rule
out models where the large semi-major axis for the putative candidate companion
Fomalhaut b is explained by dynamical scattering from a more massive companion
in the inner stellar system, where such giant planets are thought to form.
