Context. The wind-driven halo is a feature that is observed in images that were delivered by
the latest generation of ground-based instruments that are equipped with an extreme …

Observations of circumstellar environments that look for the direct signal of exoplanets and
the scattered light from disks have significant instrumental implications. In the past 15 years …

Aims. Using the direct-imaging technique, we searched for low-mass companions around
the star AF Lep, which presents a significant proper-motion anomaly (PMa) signal obtained …

Adaptive optics (AO) has become an indispensable tool at ground-based solar telescopes.
AO enables the ground-based observer to overcome the adverse effects of atmospheric …

Context. The study of dynamical processes in protoplanetary disks is essential to understand
planet formation. In this context, transition disks are prime targets because they are at an …

Context. Understanding the diversity of planets requires studying the morphology and
physical conditions in the protoplanetary disks in which they form. Aims. We aim to study the …

Context. Circumstellar disks and self-luminous giant exoplanets or companion brown dwarfs
can be characterized through direct-imaging polarimetry at near-infrared wavelengths …

Context. Polarimetric imaging is one of the most effective techniques for high-contrast
imaging and for the characterization of protoplanetary disks, and it has the potential of …

Context. The protoplanetary disk around the F-type star HD 135344B (SAO 206462) is in a
transition stage and shows many intriguing structures both in scattered light and thermal …

Context. The direct imaging of potentially habitable exoplanets is one prime science case for
the next generation of high contrast imaging instruments on ground-based, extremely large …