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We present the first high spatial and spectral observations of thecircumstellar envelope (CSE) of a B[e] supergiant (CPD$-57 2874$), performedwith the Very Large Telescope Interferometer (VLTI). Spectra, visibilities, andclosure phase, were obtained using the beam-combiner instruments AMBER (near-IRinterferometry with three 8.3 m Unit Telescopes or UTs) and MIDI (mid-IRinterferometry with two UTs). The interferometric observations of the CSE arewell fitted by an elliptical Gaussian model with FWHM diameters varyinglinearly with wavelength. Typical diameters measured are $\simeq1.8\times3.4$mas or $\simeq4.5\times8.5$ AU (adopting a distance of 2.5 kpc) at$2.2\micron$, and $\simeq12\times15$ mas or $\simeq30\times38$ AU at$12\micron$. The size of the region emitting the Br$\gamma$ flux is$\simeq2.8\times5.2$ mas or $\simeq7.0\times13.0$ AU. The major-axis positionangle of the elongated CSE in the mid-IR ($\simeq144\degr$) agrees well withprevious polarimetric data, hinting that the hot-dust emission originates in adisk-like structure. In addition to the interferometric observations we alsopresent new optical ($UBVR_{c}I_{c}$) and near-IR ($JHKL$) broadbandphotometric observations of CPD$-57 2874$. Our spectro-interferometric VLTIobservations and data analysis support the non-spherical CSE paradigm for B[e]supergiants.Comment: Accepted by A&

AMBER/VLTI and MIDI/VLTI spectro-interferometric observations of the B[e] supergiant CPD$-57\mathrm{^\circ}\,2874$