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We address the effects of bar-driven secular evolution in discs by comparingtheir properties in a sample of nearly 700 unbarred and barred (42 +- 3 percent of the population) massive disc galaxies (M* > 10^10 Msun). We make use ofaccurate structural parameters derived from i-band bulge/disc/bardecompositions to show that, as a population, barred discs tend to have faintercentral surface brightness (Delta mu_0 ~ 0.25 mag), and disc scale lengths thatare ~15 per cent larger than those of unbarred galaxies of the same stellarmass. The corresponding distributions of mu_0 and h are statisticallyinconsistent at the 5.2 sigma and 3.8 sigma levels, respectively. Bars rarelyoccur in high-surface brightness discs, with less than 5 per cent of the barredpopulation having mu_0 < 19.5 mag arcsec^-2 -- compared to 20 per cent forunbarred galaxies. They tend to reside in moderately blue discs, with a barfraction that peaks at (g-i)_disc ~ 0.95 mag and mildly declines for both bluerand redder colours. These results demonstrate noticeable structural differencesbetween the discs of barred and unbarred galaxies, which we argue are theresult of bar-driven evolution -- in qualitative agreement with longstandingtheoretical expectations.

Evidence for Secular Evolution of Disc Structural Parameters in Massive Barred Galaxies