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        Ultraviolet-excess sources with a red/infrared counterpart : Low-mass companions, debris discs and QSO selection

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        Author
        Verbeek, K.
        Groot, Paul J.
        Scaringi, Simone
        Casares, Jorge
        Corral-Santana, Jesus M.
        Deacon, Niall
        Drew, J.E.
        Gänsicke, B.T.
        Gonzalez-Solares, E.
        Greimel, R.
        Heber, U.
        Napiwotzki, R.
        Ostensen, R.H.
        Steeghs, D.
        Wright, N.J.
        Zijlstra, A.
        Attention
        2299/13055
        Abstract
        We present the result of the cross-matching between ultraviolet (UV)-excess sources selected from the UV-Excess Survey of the Northern Galactic Plane (UVEX) and several infrared (IR) surveys (2MASS, UKIDSS and WISE). From the position in the (J - H) versus (H - K) colour-colour diagram, we select UV-excess candidate white dwarfs with an M-dwarf type companion, candidates that might have a lower mass, brown-dwarf type companion and candidates showing an IR-excess only in the K band, which might be due to a debris disc. Grids of reddened DA+dM and sdO+MS/sdB+MS model spectra are fitted to the U, g, r, i, z, J, H, K photometry in order to determine spectral types and estimate temperatures and reddening. From a sample of 964 hot candidate white dwarfs with (g - r) <0.2, the spectral energy distribution fitting shows that ~2-4 per cent of the white dwarfs have an M-dwarf companion, ∼2 per cent have a lower-mass companion, and no clear candidates for having a debris disc are found. Additionally, from WISE six UV-excess sources are selected as candidate quasi-stellar objects (QSOs). Two UV-excess sources have a WISE IR-excess showing up only in the mid-IR W3 band of WISE, making them candidate luminous infrared galaxies (LIRGs) or Sbc starburst galaxies.
        Publication date
        2014-02
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stt1492
        Other links
        http://hdl.handle.net/2299/13055
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