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Table A.1

Distribution of PPD sources over the host star type.

Type Sources KS

Herbig Ae or Be 15 3
T-Tauri 39 21
Unknown central star (ONC) 36 35
Young stellar object 11 8

Notes. “Unknown central star” indicates systems in which the central body has either not been detected or classified yet (mostly proplyd silhouettes in the ONC). Young stellar objects are classified as such if their enhanced envelope emission suggests a younger age than T-Tauri or Herbig Ae/Be. The “KS” column shows the sample after applying density and radius cuts for the KS test of Fig. 1.

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