The far reaches of the beta Pictoris debris disk
Markus Janson, Alexis Brandeker, G\"oran Olofsson, Rene Liseau

TL;DR
This study reveals the complex and asymmetric structure of the outer beta Pictoris debris disk using deep archival imaging, indicating a highly eccentric and dynamically disturbed outer disk region.
Contribution
The paper provides the deepest imaging analysis of the outer beta Pictoris debris disk, uncovering significant asymmetries and morphological features not previously observed.
Findings
Pronounced brightness asymmetry between the two arms at large separations.
Detection of a tilt angle asymmetry increasing with distance.
Evidence suggesting a highly eccentric and disturbed outer disk component.
Abstract
The nearby young star beta Pictoris hosts a rich and complex planetary system, with at least two giant planets and a nearly edge-on debris disk that contains several dynamical subpopulations of planetesimals. While the inner ranges of the debris disk have been studied extensively, less information is known about the outer, fainter parts of the disk. Here we present an analysis of archival FORS V-band imaging data from 2003-2004, which have previously not been explored scientifically because the halo substructure of the bright stellar point spread function is complex. Through a high-contrast scheme based on angular differential imaging, with a forward-modelling approach to mitigate self-subtraction, we produced the deepest imaging yet for the outer range of the beta Pic disk, and extracted its morphological characteristics. A brightness asymmetry between the two arms of the edge-on disk,…
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