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

• Published in: Monthly Notices of the Royal Astronomical Society
• Main Authors: Hrudková, M., Skillen, I., Benn, C.~R., Gibson, N.~P., Pollacco, D., Nesvorný, D., Augusteijn, T., Tulloch, S.~M., Joshi, Y.~C.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2010
• Subjects: /dk/atira/pure/subjectarea/asjc/1900/1912; Space and Planetary Science; /dk/atira/pure/subjectarea/asjc/3100/3103; Astronomy and Astrophysics; Norway; Observatorio; Iceland
• Online Access: https://pure.qub.ac.uk/en/publications/tight-constraints-on-the-existence-of-additional-planets-around-hd-189733(506bbd66-d2fb-462a-8d73-900050bc1ae6).html; https://doi.org/10.1111/j.1365-2966.2010.16247.x; http://www.scopus.com/inward/record.url?scp=77953054183&partnerID=8YFLogxK

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. Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. ‡