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Aims. The transiting planet WASP-12 b was identified as a potential
target for transit-timing studies because a departure from a linear ephemeris has been
reported in the literature. Such deviations could be caused by an additional planet in the
system. We attempt to confirm the claimed variations in transit timing and interpret their
origin.
Methods. We organised a multi-site campaign to observe transits by
WASP-12 b in three observing seasons, using 0.5–2.6-metre telescopes.
Results. We obtained 61 transit light curves, many of them with
sub-millimagnitude precision. The simultaneous analysis of the best-quality datasets
allowed us to obtain refined system parameters, which agree with values reported in
previous studies. The residuals versus a linear ephemeris reveal a possible periodic
signal that may be approximated by a sinusoid with an amplitude of 0.00068 ± 0.00013 d and
period of 500 ± 20 orbital periods of WASP-12 b. The joint analysis of timing data and
published radial velocity measurements results in a two-planet model that explains
observations better than do single-planet scenarios. We hypothesise that WASP-12 b might
not be the only planet in the system, and there might be the additional 0.1
MJup body on a 3.6-d eccentric orbit. A dynamical analysis
indicates that the proposed two-planet system is stable on long timescales
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