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Very few debris discs have been imaged in scattered light at wavelengthsbeyond 3 microns because the thermal emission from both the sky and thetelescope is generally too strong with respect to the faint emission of adebris disc. We present here the first analysis of a high angular resolutionimage of the disc of beta Pictoris at 3.8 microns. Our primary objective is toprobe the innermost parts of the beta Pictoris debris disc and describe itsmorphology. We performed extensive forward modelling to correct for the biasesinduced by angular differential imaging on extended objects and derive thephysical parameters of the disc. This work relies on a new analysis of sevenarchival datasets of beta Pictoris observed with VLT/NaCo in the Lp band,associated with disc forward modelling to correct for the biases induced bythat technique. The disc is detected above a 5 sigma level between 0.4" and3.8". The two extensions have a similar brightness within error bars. Weconfirm an asymmetry previously observed at larger distances from the star andat shorter wavelengths: the isophotes are more widely spaced on the north-westside (above the disc apparent midplane) than on the south-east side. This isinterpreted as a small inclination of the disc combined with anisotropicscattering. Our best-fit model has an inclination of 86 degrees with ananisotropic Henyey- Greenstein coefficient of 0.36. This interpretation issupported by a new asymmetry detected in the disc: the disc is significantlybowed towards the north-west within 3" (above the apparent midplane). We alsodetect a possible new asymmetry within 1", but at this stage we cannot discernbetween a real feature and an underlying speckle.

Very deep images of the innermost regions of the beta Pictoris debris disc at Lp