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We measure the redshift evolution of the bar fraction in a sample of 2380visually selected disc galaxies found in Cosmic Evolution Survey (COSMOS)Hubble Space Telescope (HST) images. The visual classifications used toidentify both the disc sample and to indicate the presence of stellar bars wereprovided by citizen scientists via the Galaxy Zoo: Hubble (GZH) project. Wefind that the overall bar fraction decreases by a factor of two, from 22+/-5%at z=0.4 (tlb = 4.2 Gyr) to 11+/-2% at z=1.0 (tlb = 7.8 Gyr), consistent withprevious analysis. We show that this decrease, of the strong bar fraction in avolume limited sample of massive disc galaxies [stellar mass limit oflog(Mstar/Msun) > 10.0], cannot be due to redshift dependent biases hidingeither bars or disc galaxies at higher redshifts. Splitting our sample intothree bins of mass we find that the decrease in bar fraction is most prominentin the highest mass bin, while the lower mass discs in our sample show a moremodest evolution. We also include a sample of 98 red disc galaxies. Thesegalaxies have a high bar fraction (45+/-5%), and are missing from other COSMOSsamples which used SED fitting or colours to identify high redshift discs. Ourresults are consistent with a picture in which the evolution of massive discgalaxies begins to be affected by slow (secular) internal process at z~1. Wediscuss possible connections of the decrease in bar fraction to the redshift,including the growth of stable disc galaxies, mass evolution of the gas contentin disc galaxies, as well as the mass dependent effects of tidal interactions.

Galaxy Zoo: An independent look at the evolution of the bar fraction over the last eight billion years from HST-COSMOS