  The results of a comprehensive infrared imaging search for the putative 0.06
solar mass astrometric companion to the 4.4 pc white dwarf van Mannen 2 are
reported. Adaptive optics images acquired at 3.8 microns reveal a diffraction
limited core of 0.09" and no direct evidence of a secondary. Models predict
that at 5 Gyr, a 50 jupiter mass brown dwarf would be only 1 magnitude fainter
than van Maanen 2 at this wavelength and the astrometric analysis suggested a
separation of 0.2". In the case of a chance alignment along the line of sight,
a 0.4 mag excess should be measured. An independent photometric observation at
the same wavelength reveals no excess. In addition, there exist published ISO
observations of van Maanen 2 at 6.8 and 15.0 microns which are consistent with
photospheric flux of a 6750 K white dwarf. If recent brown dwarf models are
correct, there is no substellar companion with T > 500 K.
