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The spectroscopic catalogue of white dwarf-main sequence (WDMS) binaries fromthe Sloan Digital Sky Survey (SDSS) is the largest and most homogeneous sampleof compact binary stars currently known. However, because of selection effects,the current sample is strongly biased against systems containing cool whitedwarfs and/or early type companions, which are predicted to dominate theintrinsic population. In this study we present colour selection criteria thatcombines optical (ugriz DR8 SDSS) plus infrared (yjhk DR9 UKIRT Infrared SkySurvey (UKIDSS), JHK Two Micron All Sky Survey (2MASS) and/or w1w2 Wide-FieldInfrared Survey Explorer (WISE)) magnitudes to select 3419 photometriccandidates of harbouring cool white dwarfs and/or dominant (M dwarf)companions. We demonstrate that 84 per cent of our selected candidates are verylikely genuine WDMS binaries, and that the white dwarf effective temperaturesand secondary star spectral types of 71 per cent of our selected sources areexpected to be below <~10000-15000K, and concentrated at ~M2-3, respectively.We also present an updated version of the spectroscopic SDSS WDMS binarycatalogue, which incorporates 47 new systems from SDSS DR8. The bulk of the DR8spectroscopy is made up of main-sequence stars and red giants that weretargeted as part of the Sloan Extension for Galactic Understanding andExploration (SEGUE) Survey, therefore the number of new spectroscopic WDMSbinaries in DR8 is very small compared to previous SDSS data releases. Despitetheir low number, DR8 WDMS binaries are found to be dominated by systemscontaining cool white dwarfs and therefore represent an important addition tothe spectroscopic sample. The updated SDSS DR8 spectroscopic catalogue of WDMSbinaries consists of 2316 systems.

White dwarf-main sequence binaries from SDSS DR8: unveiling the cool white dwarf population