The Sun, stars similar to it, and many rather dissimilar to it, have chromospheres, regions
classically viewed as lying above the brilliant photosphere and characterized by a positive …

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; …

BANYAN Σ is a new Bayesian algorithm to identify members of young stellar associations
within 150 pc of the Sun. It includes 27 young associations with ages in the range∼ 1–800 …

We present an analysis of the intrinsic colors and temperatures of 5–30 Myr old pre-main-
sequence (pre-MS) stars using the F0-through M9-type members of nearby, negligibly …

Context. The relevance of M dwarfs in the search for potentially habitable Earth-sized
planets has grown significantly in the last years. Aims. In our on-going effort to …

We present a self-consistent, absolute isochronal age scale for young (≲ 200 Myr), nearby
(≲ 100 pc) moving groups in the solar neighbourhood based on homogeneous fitting of …

We present results of a spectroscopic survey for new K-and M-type members of Scorpius–
Centaurus (Sco–Cen), the nearest OB Association (∼ 100–200 pc). Using an X-ray, proper …

We present a sample of 824 solar and late-type stars with X-ray luminosities and rotation
periods. This is used to study the relationship between rotation and stellar activity and derive …

It is critical for James Webb Space Telescope (JWST) science that instrumental units are
converted to physical units. We detail the design of the JWST absolute flux calibration …

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 …