Planets form in disks of gas and dust around young stars. The disk molecular reservoirs and
their chemical evolution affect all aspects of planet formation, from the coagulation of dust …

An observational review is provided of the properties of accretion disks around young stars.
It concerns the primordial disks of intermediate-and high-mass young stellar objects in …

Context. Understanding the diversity of planets requires studying the morphology and
physical conditions in the protoplanetary disks in which they form. Aims. We aim to study the …

Aims. Photodissociation by UV light is an important destruction mechanism for carbon
monoxide (CO) in many astrophysical environments, ranging from interstellar clouds to …

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

Context. Emission lines from protoplanetary disks originate mainly in the irradiated surface
layers, where the gas is generally warmer than the dust. Therefore, interpreting emission …

Context. Planet formation is closely related to the structure and dispersal of protoplanetary
disks. A certain class of disks, called transition disks, exhibit cavities in dust images at scales …

We present an overview and first results from a M-band spectroscopic survey of planet-
forming disks performed with iSHELL on the Infrared Telescope Facility, using two slits that …

ABSTRACT We present a Spitzer InfraRed Spectrometer search for 10–36 μm molecular
emission from a large sample of protoplanetary disks, including lines from H 2 O, OH, C 2 H …

Abstract Herbig Ae/Be stars are young contracting stars on the radiative track in the HR
diagram on their way to the main sequence. These stars provide a valuable link between …