A White Dwarf-Main Sequence Binary Unveiled by Time-Domain Observations from LAMOST and TESS

Abstract

We report a single-lined white dwarf-main sequence binary system, LAMOST J172900.17+652952.8, which is discovered by LAMOST's medium resolution time-domain surveys. The radial velocity semi-amplitude and orbital period of the optical visible star are measured by using the Palomar 200-inch telescope follow-up observations and the light curves from TESS. Thus the mass function of the invisible candidate white dwarf is derived, $f(M_2)=0.120\pm 0.003M_{\odot }$. The mass of the visible star is measured based on the spectral energy distribution fitting, $M_1$ = $0.81_{-0.06}^{+0.07}{M}_{\odot }$. Hence, the mass of its invisible companion is $M_2\gtrsim 0.63M_{\odot }$. The companion ought to be a compact object rather than a main-sequence star owing to the mass ratio $q=M_2/M_1\gtrsim 0.78$ and the single-lined spectra. The compact object is likely to be a white dwarf except for small inclination angle, $i\lesssim 40^{\circ }$. By using the GALEX NUV flux, the effective temperature of the white dwarf candidate is constrained as $T_{\mathrm{eff}}^{\mathrm{WD}}\lesssim 12000-13500$ K. It is difficult to detect white dwarfs which are outshone by their bright companions via single-epoch optical spectroscopic surveys. Therefore, the optical time-domain surveys can play an important role in unveiling invisible white dwarfs and other compact objects in binaries.

arXiv comment15 pages, 6 figures, ApJ, 936, 33

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