In Taurus (age 1 to 2 Myr) these data suggested that primary discs are generally brighter than secondary and supported the evidence for an increasing trend of continuum emission with binary separation: discs in pairs wider than a ≈ 300 au are as luminous as singles, those with separations between 30 and 300 au have five time less flux, and those closer than a ≈ 30 au are fainter by an additional factor of five. 1 Instead, no clear relation between continuum flux and binary mass ratio was found [ 40 ].
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