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We present the result of the cross-matching between UV-excess sourcesselected from the UV-excess survey of the Northern Galactic Plane (UVEX) andseveral infrared surveys (2MASS, UKIDSS and WISE). From the position in the(J-H) vs. (H-K) colour-colour diagram we select UV-excess candidate whitedwarfs with an M-dwarf type companion, candidates that might have a lower mass,brown-dwarf type companion, and candidates showing an infrared-excess only inthe K-band, which might be due to a debris disk. Grids of reddened DA+dM andsdO+MS/sdB+MS model spectra are fitted to the U,g,r,i,z,J,H,K photometry inorder to determine spectral types and estimate temperatures and reddening. Froma sample of 964 hot candidate white dwarfs with (g-r)<0.2, the spectral energydistribution fitting shows that ~2-4% of the white dwarfs have an M-dwarfcompanion, ~2% have a lower-mass companion, and no clear candidates for havinga debris disk are found. Additionally, from WISE 6 UV-excess sources areselected as candidate Quasi-Stellar Objects (QSOs). Two UV-excess sources havea WISE IR-excess showing up only in the mid-IR W3 band of WISE, making themcandidate Luminous InfraRed Galaxies (LIRGs) or Sbc star-burst galaxies.

UV-excess sources with a red/IR-counterpart: low-mass companions, debris disks and QSO selection