We review recent advances in our understanding of the innermost regions of the
circumstellar environment around young stars, made possible by the technique of long …

ABSTRACT We describe the Keck Interferometer nuller theory of operation, data reduction,
and on-sky performance, particularly as it applies to the nuller exozodiacal dust key science …

ABSTRACT The Keck Interferometer Nuller (KIN), the first operational separated-aperture
infrared nulling interferometer, was designed to null the mid-infrared emission from nearby …

Nulling interferometry, a powerful technique for high-resolution imaging of the close
neighbourhood of bright astrophysical objets, is currently considered for future space …

Achromatic coronagraphs are the subject of intensive research since they will be mandatory
for many programs which aim at detecting and characterizing exoplanets. We report a …

The detection of faint companions to bright stars requires the development of very-high-
contrast-ratio detection techniques such as nulling interferometry. Here we present, to our …

Circumstellar imaging across the electromagnetic spectrum allows us to derive fundamental
diagnostics for the physics of mass loss in the Asymptotic Giant Branch (AGB) phase. I …

The paper describes the measurement and control algorithms of the near-infrared fringe
trackers of the Keck Interferometer (KI). The fringe trackers provide fringe amplitude …

Phase shifters are a key component of nulling interferometry, one of the potential routes to
enabling the measurement of faint exoplanet spectra. Here, three different achromatic phase …

The study of planets beyond the solar system and the search for other habitable planets and
life is just beginning. Ground-based (radial velocity and transits) and space-based surveys …