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The young (50-400 Myr) A3V star $\beta$ Leo is a primary target to study theformation history and evolution of extrasolar planetary systems as one of thefew stars with known hot ($\sim$1600$^\circ$K), warm ($\sim$600$^\circ$K), andcold ($\sim$120$^\circ$K) dust belt components. In this paper, we present deepmid-infrared measurements of the warm dust brightness obtained with the LargeBinocular Telescope Interferometer (LBTI) as part of its exozodiacal dustsurvey (HOSTS). The measured excess is 0.47\%$\pm$0.050\% within the central1.5 au, rising to 0.81\%$\pm$0.026\% within 4.5 au, outside the habitable zoneof $\beta$~Leo. This dust level is 50 $\pm$ 10 times greater than in the solarsystem's zodiacal cloud. Poynting-Robertson drag on the cold dust detected bySpitzer and Herschel under-predicts the dust present in the habitable zone of$\beta$~Leo, suggesting an additional delivery mechanism (e.g.,~comets) or anadditional belt at $\sim$5.5 au. A model of these dust components is providedwhich implies the absence of planets more than a few Saturn masses between$\sim$5 au and the outer belt at $\sim$40 au. We also observationally constraingiant planets with the LBTI imaging channel at 3.8~$\mu$m wavelength. Assumingan age of 50 Myr, any planet in the system between approximately 5 au to 50 aumust be less than a few Jupiter masses, consistent with our dust model. Takentogether, these observations showcase the deep contrasts and detectioncapabilities attainable by the LBTI for both warm exozodiacal dust and giantexoplanets in or near the habitable zone of nearby stars.

The HOSTS survey: evidence for an extended dust disk and constraints on the presence of giant planets in the Habitable Zone of $\beta$ Leo