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We present new observations of the faint "Sirius-like" companion discoveredto orbit HD 114174. Previous attempts to image HD 114174 B at mid-infraredwavelengths using NIRC2 at Keck have resulted in a non-detection. Our newL'-band observations taken with the Large Binocular Telescope and LMIRCamrecover the companion ($\Delta L$ = 10.15 $\pm$ 0.15 mag, $\rho$ = 0.675''$\pm$ 0.016'') with a high signal-to-noise ratio (10 $\sigma$). Thismeasurement represents the deepest L' high-contrast imaging detection atsub-arcsecond separations to date, including extrasolar planets. We confirmthat HD 114174 B has near-infrared colors consistent with the interpretation ofa cool white dwarf ($J-L'$ = 0.76 $\pm$ 0.19 mag, $K-L'$ = 0.64 $\pm$ 0.20).New model fits to the object's spectral energy distribution indicate atemperature $T_{\rm eff}$ = 4260 $\pm$ 360 K, surface gravity log g = 7.94$\pm$ 0.03, a cooling age t$_{c} \approx$ 7.8 Gyr, and mass $M$ = 0.54 $\pm$0.01 $M_{\odot}$. We find that the cooling age given by theoretical atmosphericmodels do not agree with the age of HD 114174 A derived from bothisochronological and gyrochronological analyses. We speculate on possiblescenarios to explain the apparent age discrepancy between the primary andsecondary. HD 114174 B is a nearby benchmark white dwarf that will ultimatelyenable a dynamical mass estimate through continued Doppler and astrometricmonitoring. Efforts to characterize its physical properties in detail will testtheoretical atmospheric models and improve our understanding of white dwarfevolution, cooling, and progenitor masses.

Mid-Infrared High-Contrast Imaging of HD 114174 B : An Apparent Age Discrepancy in a "Sirius-Like" Binary System