Tight constraints on the existence of additional planets around HD 189733

Details Tight constraints on the existence of additional planets around HD 189733 Tight constraints on the existence of additional planets around HD 189733

2010-01-04

arxiv.org/abs/1001.0501v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

10 pages, 4 figures, accepted by MNRAS

Scientific paper

We report a transit timing study of the transiting exoplanetary system HD 189733. In total we observed ten transits in 2006 and 2008 with the 2.6-m Nordic Optical Telescope, and two transits in 2007 with the 4.2-m William Herschel Telescope. We used Markov-Chain Monte Carlo simulations to derive the system parameters and their uncertainties, and our results are in a good agreement with previously published values. We performed two independent analyses of transit timing residuals to place upper mass limits on putative perturbing planets. The results show no evidence for the presence of planets down to 1 Earth mass near the 1:2 and 2:1 resonance orbits, and planets down to 2.2 Earth masses near the 3:5 and 5:3 resonance orbits with HD 189733b. These are the strongest limits to date on the presence of other planets in this system.

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