论文信息 - Tight constraints on the existence of additional planets around HD 189733 - 字舞流文

Tight constraints on the existence of additional planets around HD 189733

We report a transit timing study of the transiting exoplanetary system HD 189733. In total, we observed 10 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.

Isaac Newton Group of Telescopes | School of Physics | University of Toronto Institute for Aerospace Studies | D. Pollacco | I. Skillen | N. P. Gibson | T. Augusteijn | Thuringer Landessternwarte Tautenburg | S. M. Tulloch | C. R. Benn | S. O. Physics | T. Augusteijn | S. Tulloch | C. Benn | I. Skillen | D. Pollacco | N. Gibson | Q. Belfast | Queen's University Belfast | M. Hrudkov'a | M. Hrudkov'a | D. Nesvorn'y | Y. C. J. A. I. O. T. C. U. Prague | Southwest Research Institute Boulder | Nordic Optical Telescope Aryabhatta Research Institute of Sciences | D. Nesvorn'y | Y. C. Joshi Astronomical Institute of the Charles Uni Prague | University of Exeter Department of Space Studies | Queen's University of Belfast

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