The time evolution of dusty protoplanetary disc radii: Observed and physical radii differ
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Peer-reviewed
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Abstract
Proto-planetary disc surveys conducted with ALMA are measuring disc radii in
multiple star forming regions. The disc radius is a fundamental quantity to
diagnose whether discs undergo viscous spreading, discriminating between
viscosity or angular momentum removal by winds as drivers of disc evolution.
Observationally, however, the sub-mm continuum emission is dominated by the
dust, which also drifts inwards, complicating the picture. In this paper we
investigate, using theoretical models of dust grain growth and radial drift,
how the radii of dusty viscous proto-planetary discs evolve with time. Despite
the existence of a sharp outer edge in the dust distribution, we find that the
radius enclosing most of the dust
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1365-2966
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European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (823823)
Science and Technology Facilities Council (ST/N000927/1)
Science and Technology Facilities Council (ST/S000623/1)