Enlightening the chemistry of infalling envelopes and accretion disks
  around Sun-like protostars: the ALMA FAUST project
  The huge variety of planetary systems discovered in recent decades likely
depends on the early history of their formation. In this contribution we
introduce the FAUST Large Program, which focuses specifically on the early
history of Solar-like protostars and their chemical diversity at scales of
$\sim$ 50 au, where planets are expected to form. In particular, the goal of
the project is to reveal and quantify the variety of chemical composition of
the envelope/disk system at scales of 50 au in a sample of Class 0 and I
protostars representative of the chemical diversity observed at larger scales.
For each source, we propose a set of molecules able to: (1) disentangle the
components of the 50-2000 au envelope/disk system; (2) characterise the organic
complexity in each of them; (3) probe their ionization structure; (4) measure
their molecular deuteration. The output will be a homogeneous database of
thousands of images from different lines and species, i.e., an unprecedented
source-survey of the chemical diversity of Solar-like protostars. FAUST will
provide the community with a legacy dataset that will be a milestone for
astrochemistry and star formation studies.
