Polarized contrast as a function of dust mass in the system, the accretion lifetime and the system age. Left: polarized contrast vs. dust mass in the system as measured from ALMA continuum photometry. Middle: polarized contrast vs. accretion lifetime of the systems as calculated from the accretion rate measured by Manara et al. (2019), normalized by the dust mass in each system. Right: polarized contrast vs. system age.