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HD 11112 is an old, Sun-like star that has a long-term radial velocity (RV)trend indicative of a massive companion on a wide orbit. Here we present directimages of the source responsible for the trend using the Magellan AdaptiveOptics system. We detect the object (HD 11112B) at a separation of 2\fasec 2(100 AU) at multiple wavelengths spanning 0.6-4 \microns ~and show that it ismost likely a gravitationally-bound cool white dwarf. Modeling its spectralenergy distribution (SED) suggests that its mass is 0.9-1.1 \msun, whichcorresponds to very high-eccentricity, near edge-on orbits from Markov chainMonte Carlo analysis of the RV and imaging data together. The total age of thewhite dwarf is $>2\sigma$ discrepant with that of the primary star under mostassumptions. The problem can be resolved if the white dwarf progenitor wasinitially a double white dwarf binary that then merged into the observedhigh-mass white dwarf. HD 11112B is a unique and intriguing benchmark objectthat can be used to calibrate atmospheric and evolutionary models of cool whitedwarfs and should thus continue to be monitored by RV and direct imaging overthe coming years.

MagAO Imaging of Long-period Objects (MILO). II. A Puzzling White Dwarf around the Sun-like Star HD 11112