A transit timing analysis of seven RISE light curves of the exoplanet system HAT-P-3

N. P. Gibson, D. L. Pollacco, S. Barros, C. Benn, D. Christian, M. Hrudkova, Y. C. Joshi, F. P. Keenan, E. K. Simpson, I. Skillen, I. A. Steele, I. Todd

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


We present seven light curves of the exoplanet system HAT-P-3, taken as part of a transit timing programme using the rapid imager to search for exoplanets instrument on the Liverpool Telescope. The light curves are analysed using a Markov chain Monte Carlo algorithm to update the parameters of the system. The inclination is found to be i = 86.75+0.22-0.21°, the planet-star radius ratio to be Rp/R* = 0.1098+0.0010-0.0012 and the stellar radius to be R* = 0.834+0.018-0.026Rsolar, consistent with previous results but with a significant improvement in the precision. Central transit times and uncertainties for each light curve are also determined, and a residual permutation algorithm is used as an independent check on the errors. The transit times are found to be consistent with a linear ephemeris, and a new ephemeris is calculated as Tc(0) = 2454856.70118 +/- 0.00018 HJD and P = 2.899738 +/- 0.000007 d. Model timing residuals are fitted to the measured timing residuals to place upper mass limits for a hypothetical perturbing planet as a function of the period ratio. These show that we have probed for planets with masses as low as 0.33 and 1.81 M? in the interior and exterior 2:1 resonances, respectively, assuming the planets are initially in circular orbits.
Original languageEnglish
Pages (from-to)1917-1923
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Publication statusPublished - 21 Jan 2010

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

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