ABSTRACT The second Gaia Data Release (DR2) contains astrometric and photometric
data for more than 1.6 billion objects with mean Gaia G magnitude< 20.7, including many …

Observations of debris disks, the products of the collisional evolution of rocky planetesimals,
can be used to trace planetary activity across a wide range of stellar types. The most …

The search for extraterrestrial intelligence is currently being pursued using multiple
techniques and in different wavelength bands. Dyson spheres, megastructures that could be …

We report the discovery of a circumstellar debris disk viewed nearly edge-on and associated
with the young, K1 star BD+ 45 598 using high-contrast imaging at 2.2 μm obtained at the …

Stars with excess infrared radiation from circumstellar dust are invaluable for studies of
exoplanetary systems, informing our understanding of processes of planet formation and …

Wide-field searches for young stellar objects (YSOs) can place useful constraints on the
prevalence of clustered versus distributed star formation. The Spitzer/IRAC Candidate YSO …

Exozodiacal dust, warm debris from comets and asteroids in and near the habitable zone of
stellar systems, reveals the physical processes that shape planetary systems. Scattered light …

The GALEX Nearby Young Star Search (GALNYSS) yielded the identification of more than
2000 late-type stars that, based on their ultraviolet and infrared colors and pre-Gaia proper …

Abstract The Disk Detective citizen science project recently released a new catalog of disk
candidates found by visual inspection of images from NASA's Wide-field Infrared Survey …

Empirically, the estimated lifetime of a typical protoplanetary disk is< 5–10 Myr. However, the
disk lifetimes required to produce a variety of observed exoplanetary systems may exceed …