Transitional disks are objects whose inner disk regions have undergone substantial
clearing. The Spitzer Space Telescope produced detailed spectral energy distributions …

Abstract Herbig Ae/Be stars (HAeBes) span a key mass range that links low-and high-mass
stars, and thus provide an ideal window from which to explore their formation. This paper …

Molecular line observations are powerful tracers of the physical and chemical conditions
across the different evolutionary stages of star, disk, and planet formation. The high angular …

Aims. The composition of planetary solids and gases is largely rooted in the processing of
volatile elements in protoplanetary disks. To shed light on the key processes, we carry out a …

Context. With the Herschel Space Observatory, lines of simple molecules (C+, O, and high-J
lines of CO, J up≳ 14) have been observed in the atmosphere of protoplanetary disks. When …

Isolated Herbig Ae stars can be divided into two groups (Meeus et al. 2001): those with an
almost flat spectral energy distribution in the mid-infrared (“group I”), and those with a strong …

We present H-and K s-band polarized differential images of the Herbig Ae/Be star
HD142527, revealing its optically thick outer disk and the nearly empty gap. The very small …

Context. Transitional disks represent a short stage of the evolution of circumstellar material.
Studies of dust grains in these objects can provide pivotal information on the mechanisms of …

We present new numerical simulations in the thin disk approximation that characterize the
burst mode of protostellar accretion. The burst mode begins upon the formation of a …

We present high-contrast observations of the circumstellar environment of the Herbig Ae/Be
star HD 100546. The final 3.8 μm image reveals an emission source at a projected …