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 …

Direct imaging of gas giant exoplanets provides information on their atmospheres and the
architectures of planetary systems. However, few planets have been detected in blind …

Photonic technologies offer numerous functionalities that can be used to realize
astrophotonic instruments. The most spectacular example to date is the ESO Gravity …

Context. Direct imaging of extrasolar giant planets demands the highest possible contrasts
(ΔH≳ 10 mag) at the smallest angular separations (∼ 0.1 ″) from the star. We present an …

Adaptive optics (AO) is critical in astronomy, optical communications and remote sensing to
deal with the rapid blurring caused by the Earth's turbulent atmosphere. But current AO …

Context. The pyramid was proven to be a highly sensitive and versatile wave-front sensor
(WFS) and has been selected to be installed on the single conjugate adaptive optics (AO) …

Astrophotonics represents a cutting-edge approach in observational astronomy. This paper
explores the significant advancements and potential applications of astrophotonics …

Context. The scattering properties of the dust originating from debris discs are still poorly
known. The analysis of scattered light is however a powerful remote-sensing tool to …

Second-generation exoplanet imagers using extreme adaptive optics (ExAO) and
coronagraphy have demonstrated their great potential for studying close circumstellar …