Over the last two decades, several thousand exoplanets have been identified, and their
study has become a high scientific priority. Direct imaging of nearby exoplanets and the …

We present a statistical analysis of the first 300 stars observed by the Gemini Planet Imager
Exoplanet Survey. This subsample includes six detected planets and three brown dwarfs; …

Directly detecting thermal emission from young extrasolar planets allows measurement of
their atmospheric compositions and luminosities, which are influenced by their formation …

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 …

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 …

Angular differential imaging is a high-contrast imaging technique that reduces quasistatic
speckle noise and facilitates the detection of nearby companions. A sequence of images is …

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 exoplanets is limited by bright quasi-static speckles in the point-spread
function (PSF) of the central star. This limitation can be reduced by subtraction of reference …

Context. Ground-based high-dispersion (R~ 100 000) spectroscopy (HDS) is proving to be a
powerful technique with which to characterize extrasolar planets. The planet signal is …

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 …