Six High-Precision Transits of OGLE-TR-113b

Abstract

We present six new transits of the hot Jupiter OGLE-TR-113b observed with MagIC on the Magellan Telescopes between January 2007 and May 2009. We update the system parameters and revise the planetary radius to R_p=1.084 pm 0.029 R_J, where the error is dominated by stellar radius uncertainties. The new transit midtimes reveal no transit timing variations from a constant ephemeris of greater than 13 pm 28 seconds over two years, placing an upper limit of 1-2 M_Earth on the mass of any perturber in a 1:2 or 2:1 mean-motion resonance with OGLE-TR-113b. Combining the new transit epochs with five epochs published between 2002 and 2006, we find hints that the orbital period of the planet may not be constant, with the best fit indicating a decrease of dP/dt=-60 pm 15 milliseconds per year. If real, this change in period could result from either a long-period (more than 8 years) timing variation due to a massive external perturber, or more intriguingly from the orbital decay of the planet. The detection of a changing period is still tentative and requires additional observations, but if confirmed it would enable direct tests of tidal stability and dynamical models of close-in planets.

9 pages, 3 figures; accepted by ApJ

References in corpus (12)

• The effect of red noise on planetary transit detection
• Homogeneous studies of transiting extrasolar planets. I. Light curve analyses
• Falling Transiting Extrasolar Giant Planets
• Stability Limits in Extra-solar Planetary Systems
• High accuracy transit photometry of the planet OGLE-TR-113b with a new deconvolution-based method
• Determination of the size, mass, and density of "exomoons" from photometric transit timing variations
• Using Transit Timing Observations to Search for Trojans of Transiting Extrasolar Planets
• Using long-term transit timing to detect terrestrial planets
• Lack of Transit Timing Variations of OGLE-TR-111b: A re-analysis with six new epochs
• K-band transit and secondary eclipse photometry of exoplanet OGLE-TR-113b
• Millimagnitude Photometry for Transiting Extrasolar Planetary Candidates: II. Transits of OGLE-TR-113-b in the Optical and Near-IR
• Chemical abundances for the transiting planet host stars OGLE-TR-10, 56, 111, 113, 132 and TrES-1. Abundances in different galactic populations