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We present new deep co-adds of data taken within Stripe 82 of the SloanDigital Sky Survey (SDSS), especially stacked to reach the faintest surfacebrightness limits of this data set. Stripe 82 covers 275 square degrees within-50 < RA < +60 and -1.25 < Dec. < +1.25. We discuss the steps of our reductionwhich puts special emphasis on preserving the characteristics of the background(sky + diffuse light) in the input images using a non-aggressive skysubtraction strategy. Our reduction reaches a limit of ~28.5 mag/arcsec^2 (3sigma, 10x10 arcsec^2) in the r band. The effective surface brightness limit(50% completeness for exponential light distribution) lies at <mu_e(r)> ~ 25.5mag/arcsec^2. For point sources, we reach 50% completeness limits (3 sigmalevel) of (24.2,25.2,24.7,24.3,23.0) mag in (u,g,r,i,z). This is between 1.7and 2.0 mag deeper than the single epoch SDSS releases. The co-adds show pointspread functions with median FWHM values ranging between 1 arcsec in i and z to1.3 arcsec in the u band. The imaging data are made publicly available athttp://www.iac.es/proyecto/stripe82. The release includes deep co-adds andrepresentations of the PSF for each field. Additionally, we provide objectcatalogues with stars and galaxies confidently separated until g~23 mag. TheIAC Stripe 82 coadds offer a rather unique possibility to study the low surfacebrightness universe, exemplified by the discovery of stellar streams aroundNGC0426 and NGC0936. We also discuss further science cases like stellar haloesand disc truncations, low surface brightness galaxies, the intra-cluster lightin galaxy clusters and the diffuse emission of Galactic dust known as GalacticCirrus.

The IAC Stripe 82 Legacy Project: a wide-area survey for faint surface brightness astronomy