Imaging of Protoplanetary disks at mm/submm wavelengths

Planetary formation, which is expected to occur in protoplanetary
disks orbiting around young low-mass stars, is a major challenge of
modern astrophysics. Since the last ten years, the gas and dust
content of protoplanetary disks have been intensively observed using
mm/submm arrays. The analysis of these observations revealed the
complexity of the disk physics and chemistry. In 2011, ALMA started to
operate and opened a new era, thanks to its high sensitivity and
resolving power.  In this evolving context, I will present some recent
high angular, high sensitivity observations obtained with the IRAM
array and ALMA. I will discuss the gas (mostly CO) and dust properties
on a few prototypical objects such as DM Tauri, GG Tauri or AB Auriga.