White dwarf-main sequence binaries from LAMOST: the DR5 catalogue
2018
We present the data release (DR) 5 catalogue of white dwarf-main sequence (WDMS) binaries from
the Large Area Multi-Object fiber Spectroscopic Telescope (LAMOST). The catalogue contains
876 WDMS binaries, of which 757 are additions to our previous LAMOST DR1 sample and 357
are systems that have not been published before. We also describe a LAMOST-dedicated survey
that aims at obtaining spectra of photometrically-selected WDMS binaries from the Sloan Digital
Sky Survey (SDSS) that are expected to contain cool white dwarfs and/or early type M dwarf
companions. This is a population under-represented in previous SDSS WDMS binary catalogues. We
determine the stellar parameters (white dwarf effective temperatures, surface gravities and masses,
and M dwarf spectral types) of the LAMOST DR5 WDMS binaries and make use of the parameter
distributions to analyse the properties of the sample. We find that, despite our efforts, systems
containing cool white dwarfs remain under-represented. Moreover, we make use of LAMOST DR5
and SDSS DR14 (when available) spectra to measure the Na I λλ 8183.27, 8194.81 absorption doublet
and/or Hα emission radial velocities of our systems. This allows identifying 128 binaries displaying
significant radial velocity variations, 76 of which are new. Finally, we cross-match our catalogue
with the Catalina Surveys and identify 57 systems displaying light curve variations. These include
16 eclipsing systems, two of which are new, and nine binaries that are new eclipsing candidates. We
calculate periodograms from the photometric data and measure (estimate) the orbital periods of 30
(15) WDMS binaries.
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