The discovery of large numbers of young low-mass stars and brown dwarfs over the past
decade has made it possible to investigate star formation and early evolution in a previously …

Abstract The Near-Infrared Imager and Slitless Spectrograph (NIRISS) is the science module
of the Canadian-built Fine Guidance Sensor onboard the James Webb Space Telescope …

We present the results of a comprehensive assessment of companions to solar-type stars. A
sample of 454 stars, including the Sun, was selected from the Hipparcos catalog with π> 40 …

While the strong anticorrelation between chromospheric activity and age has led to the
common use of the Ca ii H and K emission index (R^{\prime} _ {\mathrm {HK}\,}= L …

We present the full results of our decade-long astrometric monitoring programs targeting 31
ultracool binaries with component spectral types M7–T5. Joint analysis of resolved imaging …

We report new VLT/NACO imaging observations of the young, nearby brown dwarf
2MASSW J1207334-393254 and its suggested planetary mass companion (2M1207 b) …

We report results of a direct imaging survey for giant planets around 80 members of the β
Pic, TW Hya, Tucana-Horologium, AB Dor, and Hercules-Lyra moving groups, observed as …

We report deep imaging observations of the young, nearby star AB Pic, a member of the
large Tucana-Horologium association. We have detected a faint, red source South of the star …

We utilized the new high-order 585 actuator Magellan Adaptive Optics system (MagAO) to
obtain very high-resolution visible light images of HD 142527 with MagAO's VisAO science …

A significant population of stars with ages younger than the Pleiades exists in the solar
neighborhood. They are grouped in loose young associations, sharing similar kinematical …