Bibcode
Green, M. J.; Hermes, J. J.; Marsh, T. R.; Steeghs, D. T. H.; Bell, Keaton J.; Littlefair, S. P.; Parsons, S. G.; Dennihy, E.; Fuchs, J. T.; Reding, J. S.; Kaiser, B. C.; Ashley, R. P.; Breedt, E.; Dhillon, V. S.; Gentile Fusillo, N. P.; Kerry, P.; Sahman, D. I.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 477, Issue 4, p.5646-5656
Fecha de publicación:
7
2018
Número de citas
20
Número de citas referidas
19
Descripción
We present the discovery of SDSS J135154.46-064309.0, a short-period
variable observed using 30-mincadence photometry in K2 Campaign 6.
Follow-up spectroscopy and high-speed photometry support a
classification as a new member of the rare class of ultracompact
accreting binaries known as AM CVn stars. The spectroscopic orbital
period of 15.65 ± 0.12 min makes this system the
fourth-shortest-period AM CVn known, and the second system of this type
to be discovered by the Kepler spacecraft. The K2 data show photometric
periods at 15.7306 ± 0.0003 min, 16.1121 ± 0.0004 min, and
664.82 ± 0.06 min, which we identify as the orbital period,
superhump period, and disc precession period, respectively. From the
superhump and orbital periods we estimate the binary mass ratio q =
M2/M1= 0.111 ± 0.005, though this method of
mass ratio determination may not be well calibrated for helium-dominated
binaries. This system is likely to be a bright foreground source of
gravitational waves in the frequency range detectable by Laser
Interferometer Space Antenna, and may be of use as a calibration source
if future studies are able to constrain the masses of its stellar
components.
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