No evidence of a hot Jupiter around HD 188753 A

Abstract

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.

8 pages, 3 figures, accepted for publication in A&A. Corrected typos and minor mistakes

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• Gl86B: a white dwarf orbits an exoplanet host star
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• Very Low-Mass Stellar and Substellar Companions to Solar-like Stars From MARVELS VI: A Giant Planet and a Brown Dwarf Candidate in a Close Binary System HD 87646
• Planetary Stability Zones in Hierarchical Triple Star Systems
• An Early Catalog of Planet Hosting Multiple Star Systems of Order Three and Higher
• Searching for Earth-mass planets around $\alpha$ Centauri: precise radial velocities from contaminated spectra