ABSTRACT A key problem in protoplanetary disc evolution is understanding the efficiency of
dust radial drift. This process makes the observed dust disc sizes shrink on relatively short …

We present an ACA search for [C i] 1–0 emission at 492 GHz toward large T Tauri disks (gas
radii≳ 200 au) in the∼ 1–3 Myr-old Lupus star-forming region. Combined with Atacama …

Context. Linking atmospheric characteristics of planets to their formation pathways is a
central theme in the study of extrasolar planets. Although the 12 C/13 C isotope ratio shows …

It is still unclear whether the evolution of protoplanetary disks, a key ingredient in the theory
of planet formation, is driven by viscous turbulence or magnetic disk winds. As viscously …

Context. The composition of planets may be largely determined by the chemical processing
and accretion of icy pebbles in protoplanetary disks. Recent observations of protoplanetary …

Context. To understand how planets form in protoplanetary disks, it is necessary to
characterize their gas and dust distribution and masses. This requires a combination of high …

We present molecular line observations of 13 CO and C 18 OJ= 3− 2, CN N= 3− 2, and CS
J= 7− 6 lines in the protoplanetary disk around TW Hya at a high spatial resolution of∼ 9 au …

Many astrochemical models of observed CO isotopologue line emission, earlier considered
a good proxy measure of H 2 and hence disk gas mass, favor large deviations in the carbon …

CO is one of the most abundant molecules in protoplanetary disks, and optically thin
emission from its isotopologues has been detected in many of them. However, several past …

Context. Recent observations of protoplanetary disks suggest that they are depleted in gas-
phase CO up to a factor of 100 with respect to predictions from physical-chemical (or thermo …