In this chapter we will discuss the evolution of dust in protoplanetary disks, focusing on the
processes of grain growth and the observational consequences of this process. In the …

Circumstellar dust exists around several hundred main sequence stars. For the youngest
stars, that dust could be a remnant of the protoplanetary disk. Mostly it is inferred to be …

▪ Abstract Until the late 1990s the rich Hyades and the sparse UMa clusters were the only
coeval, comoving concentrations of stars known within 60 pc of Earth. Both are hundreds of …

The direct characterization of exoplanetary systems with high-contrast imaging is among the
highest priorities for the broader exoplanet community. As large space missions will be …

The Sun and> 15 per cent of nearby stars are surrounded by dusty disks that must be
collisionally replenished by asteroids and comets, as the dust would otherwise be depleted …

Spatially resolved scattered-light images of circumstellar debris in exoplanetary systems
constrain the physical properties and orbits of the dust particles in these systems. They also …

We analyze the gas accretion flow through a planet-produced gap in a protoplanetary disk.
We adopt the α-disk model and ignore effects of planetary migration. We develop a …

Context. Planet formation is expected to take place in the first million years of a planetary
system through various processes, which remain to be tested through observations. Aims …

This paper confronts a simple analytical model for the steady state evolution of debris disks
due to collisions with Spitzer observations of dust around main-sequence A stars. It is …

Circumstellar disks are exposed to intense ultraviolet (UV) radiation from the young star. In
the inner disks, the UV radiation can be enhanced by more than seven orders of magnitude …