  The discovery of a short-period giant planet (a hot Jupiter) around the
primary component of the triple star system HD 188753 has often been considered
as an important observational evidence and as a serious challenge to
planet-formation theories. Following this discovery, we monitored HD 188753
during one year to better characterize the planetary orbit and the feasibility
of planet searches in close binaries and multiple star systems. We obtained
Doppler measurements of HD 188753 with the ELODIE spectrograph at the
Observatoire de Haute-Provence. We then extracted radial velocities for the two
brightest components of the system using our multi-order, two-dimensional
correlation algorithm, TODCOR. Our observations and analysis do not confirm the
existence of the short-period giant planet previously reported around HD 188753
A. Monte Carlo simulations show that we had both the precision and the temporal
sampling required to detect a planetary signal like the one quoted. From our
failure to detect the presumed planet around HD 188753 A and from the available
data on HD 188753, we conclude that there is currently no convincing evidence
of a close-in giant planet around HD 188753 A.
