Bibcode
Pala, A. F.; Gänsicke, B. T.; Marsh, T. R.; Breedt, E.; Hermes, J. J.; Landstreet, J. D.; Schreiber, M. R.; Townsley, D. M.; Wang, L.; Aungwerojwit, A.; Hambsch, F.-J.; Monard, B.; Myers, G.; Nelson, P.; Pickard, R.; Poyner, G.; Reichart, D. E.; Stubbings, R.; Godon, P.; Szkody, P.; De Martino, D.; Dhillon, V. S.; Knigge, C.; Parsons, S. G.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 1, p.1080-1103
Advertised on:
2
2019
Número de citas
17
Número de citas referidas
16
Descripción
We present high-time-resolution photometry and phase-resolved
spectroscopy of the short-period ({P_orb}= 80.52 min) cataclysmic
variable SDSS J123813.73-033933.0, observed with the Hubble Space
Telescope (HST), the Kepler/K2 mission, and the Very Large Telescope
(VLT). We also report observations of the first detected superoutburst.
SDSS J1238-0339 shows two types of variability: quasi-regular
brightenings recurring every ≃8.5 h during which the system
increases in brightness by {˜eq } 0.5 mag, and a double-hump
quasi-sinusoidal modulation at the orbital period. The detailed K2 light
curve reveals that the amplitude of the double-humps increases during
the brightenings and that their phase undergoes a ≃90° phase
shift with respect to the quiescent intervals. The HST data
unambiguously demonstrate that these phenomena both arise from the
heating and cooling of two relatively large regions on the white dwarf.
We suggest that the double-hump modulation is related to spiral shocks
in the accretion disc resulting in an enhanced accretion rate heating
two localized regions on the white dwarf, with the structure of the
shocks fixed in the binary frame explaining the period of the double
humps. The physical origin of the 8.5 h brightenings is less clear.
However, the correlation between the observed variations of the
amplitude and phase of the double-humps with the occurrence of the
brightenings is supportive of an origin in thermal instabilities in the
accretion disc.
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