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

Gibson, NP and Pollacco, DL and Barros, S and Benn, C and Christian, D and Hrudkova, M and Joshi, YC and Keenan, FP and Simpson, EK and Skillen, I and Steele, IA and Todd, I (2010) A transit timing analysis of seven RISE light curves of the exoplanet system HAT-P-3. Monthly Notices of the Royal Astronomical Society, 401 (3). pp. 1917-1923. ISSN 0035-8711

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Abstract

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+0.018−0.026 R⊙, 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) = 245 4856.701 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⊕ in the interior and exterior 2:1 resonances, respectively, assuming the planets are initially in circular orbits.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2009 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 19 Jan 2017 09:18
Last Modified: 06 Sep 2017 16:52
DOI or Identification number: 10.1111/j.1365-2966.2009.15770.x
URI: http://researchonline.ljmu.ac.uk/id/eprint/5287

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