Very deep images of the innermost regions of the beta Pictoris debris disc at Lp
J. Milli, A.-M. Lagrange, D. Mawet, O. Absil, J.-C. Augereau, D., Mouillet, A. Boccaletti, J. H. Girard, G. Chauvin

TL;DR
This study presents the first high-resolution 3.8-micron image of the beta Pictoris debris disc, revealing its inner structure, asymmetries, and bowing, using advanced modeling to correct for observational biases.
Contribution
It provides the first detailed analysis of the innermost regions of the beta Pictoris debris disc at 3.8 microns, including new asymmetry detections and refined physical parameters.
Findings
Disc detected between 0.4" and 3.8" with high significance.
Confirmed asymmetry with wider isophotes on the northwest side.
Detected disc bowing towards the northwest within 3".
Abstract
Very few debris discs have been imaged in scattered light at wavelengths beyond 3 microns because the thermal emission from both the sky and the telescope is generally too strong with respect to the faint emission of a debris disc. We present here the first analysis of a high angular resolution image of the disc of beta Pictoris at 3.8 microns. Our primary objective is to probe the innermost parts of the beta Pictoris debris disc and describe its morphology. We performed extensive forward modelling to correct for the biases induced by angular differential imaging on extended objects and derive the physical parameters of the disc. This work relies on a new analysis of seven archival datasets of beta Pictoris observed with VLT/NaCo in the Lp band, associated with disc forward modelling to correct for the biases induced by that technique. The disc is detected above a 5 sigma level between…
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