Bell, Keaton J.; Allende Prieto, C.; Curd, Brandon; Gianninas, A.; Brown, Warren R.; Kilic, M.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 471, Issue 4, p.4218-4227
Fecha de publicación:
11
2017
Número de citas
13
Número de citas referidas
13
Descripción
We present the results from a Gemini snapshot radial-velocity survey of
44 low-mass white-dwarf candidates selected from the Sloan Digital Sky
Survey (SDSS) spectroscopy. To find sub-hour orbital period binary
systems, our time-series spectroscopy had cadences of 2-8 min over a
period of 20-30 min. Through follow-up observations at Gemini and the
MMT, we identify four double-degenerate binary systems with periods
ranging from 53 min to 7 h. The shortest period system, SDSS
J123549.88+154319.3, was recently identified as a sub-hour period
detached binary by Breedt and collaborators. Here, we refine the orbital
and physical parameters of this system. High-speed and time-domain
survey photometry observations do not reveal eclipses or other
photometric effects in any of our targets. We compare the period
distribution of these four systems with the orbital period distribution
of known double white dwarfs; the median period decreases from 0.64 to
0.24 d for M = 0.3-0.5 M⊙ to M < 0.3 M⊙
white dwarfs. However, we do not find a statistically significant
correlation between the orbital period and white-dwarf mass.
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