A transit timing analysis of seven RISE light curves of the exoplanet system HATP3
Abstract
We present seven light curves of the exoplanet system HATP3, 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 planetstar radius ratio to be R_{p}/R_{*} = 0.1098^{+0.0010}_{0.0012} and the stellar radius to be R_{*} = 0.834^{+0.018}_{0.026}R_{solar}, 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 T_{c}(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.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 January 2010
 DOI:
 10.1111/j.13652966.2009.15770.x
 arXiv:
 arXiv:0909.4170
 Bibcode:
 2010MNRAS.401.1917G
 Keywords:

 methods: data analysis;
 techniques: photometric;
 stars: individual: HATP3;
 planetary systems;
 Astrophysics  Earth and Planetary Astrophysics
 EPrint:
 8 pages, 5 figures, Accepted for publication in MNRAS