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

作者：Gibson N P^*; Pollacco D L; Barros S; Benn C; Christian D; Hrudkova M; Joshi Y C; Keenan F P; Simpson E K; Skillen I; Steele I A; Todd I

来源：Monthly Notices of the Royal Astronomical Society, 2010, 401(3): 1917-1923.

DOI：10.1111/j.1365-2966.2009.15770.x

• methods: data analysis
• techniques: photometric
• stars: individual: HAT-P-3
• planetary systems

We present seven light curves of the exoplanet systemHAT-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(-0.21)(+0.22)degrees, the planet-star radius ratio to be R(p)/R(*) = 0.1098(-0.0012)(+0.0010) and the stellar radius to be R(*) = 0.834(-0.026)(+0.018) R(circle dot), 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) = 2454856.701 18 +/- 0.000 18 HJD and P = 2.899 738 +/- 0.000 007 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(sic) in the interior and exterior 2: 1 resonances, respectively, assuming the planets are initially in circular orbits.

• 出版日期2010-1-21