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

Kars Verbeek, Paul J. Groot, Simone Scaringi, Jorge Casares, Jesus M. Corral-Santana, Niall Deacon, Janet E. Drew, Boris T. Gänsicke, Eduardo González-Solares, Robert Greimel, Ulrich Heber, Ralf Napiwotzki, Roy H. østensen, Danny Steeghs, Nicholas J. Wright, Albert Zijlstra

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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.

Original languageEnglish
Article numberstt1492
Pages (from-to)2-13
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume438
Issue number1
DOIs
StatePublished - Feb 1 2014

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Keywords

  • Binaries: general
  • Galaxy: stellar content
  • ISM: general
  • Infrared: stars
  • Surveys
  • White dwarfs

Cite this

Verbeek, K., Groot, P. J., Scaringi, S., Casares, J., Corral-Santana, J. M., Deacon, N., Drew, J. E., Gänsicke, B. T., González-Solares, E., Greimel, R., Heber, U., Napiwotzki, R., østensen, R. H., Steeghs, D., Wright, N. J., & Zijlstra, A. (2014). Ultraviolet-excess sources with a red/infrared counterpart: Low-mass companions, debris discs and QSO selection. Monthly Notices of the Royal Astronomical Society, 438(1), 2-13. [stt1492]. https://doi.org/10.1093/mnras/stt1492