The interstellar medium is characterized by a rich and diverse chemistry. Many of its
complex organic molecules are proposed to form through radical chemistry in icy grain …

▪ 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 …

We present VLT/X-shooter observations of a sample of 36 accreting low-mass stellar and
substellar objects (YSOs) in the Lupus star-forming region, spanning a range in mass from …

We report observations of resolved C 2 H emission rings within the gas-rich protoplanetary
disks of TW Hya and DM Tau using the Atacama Large Millimeter Array. In each case the …

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 …

The spatial distribution of gas and solids in protoplanetary disks determines the composition
and formation efficiency of planetary systems. A number of disks show starkly different …

Abstract We present Hubble Space Telescope ultraviolet spectra and supporting ground-
based data for a sample of nine intermediate-mass T Tauri stars (IMTTSs; 1.5–4 M⊙). The …

Protoplanetary disks are the sites of planet formation, and the evolution and eventual
dispersal of these disks strongly influences the formation of planetary systems. Disk …

Since the discovery of the first extrasolar planet around a solartype star, 1 more than 900
such planets outside of our solar system have been detected by ground-and space-based …

We present an observational and theoretical study of the primary ionizing agents (cosmic
rays (CRs) and X-rays) in the TW Hya protoplanetary disk. We use a set of resolved and …