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We present new mid-infrared interferometric observations of the massive youngstellar object IRAS 13481-6124, using VLTI/MIDI for spectrally-resolved,long-baseline measurements (projected baselines up to $\sim120$ m) andGSO/T-ReCS for aperture-masking interferometry in five narrow-band filters(projected baselines of $\sim1.8-6.4$ m) in the wavelength range of $7.5-13$$\mu$m. We combine these measurements with previously-published interferometricobservations in the $K$ and $N$ bands in order to assemble the largestcollection of infrared interferometric observations for a massive YSO to date.Using a combination of geometric and radiative-transfer models, we confirm thedetection at mid-infrared wavelengths of the disk previously inferred fromnear-infrared observations. We show that the outflow cavity is also detected atboth near- and mid-infrared wavelengths, and in fact dominates the mid-infraredemission in terms of total flux. For the disk, we derive the inner radius($\sim1.8$ mas or $\sim6.5$ AU at 3.6 kpc), temperature at the inner rim($\sim1760$ K), inclination ($\sim48$ deg) and position angle ($\sim107$ deg).We determine that the mass of the disk cannot be constrained withouthigh-resolution observations in the (sub-)millimeter regime or observations ofthe disk kinematics, and could be anywhere from $\sim10^{-3}$ to $20$M$_\odot$. Finally, we discuss the prospects of interpreting the spectralenergy distributions of deeply-embedded massive YSOs, and warn againstattempting to infer disk properties from the SED.

A multi-wavelength interferometric study of the massive young stellar object IRAS 13481-6124