Transit Timing Variation Analysis of OGLE-TR-132b with Seven New Transits

TL;DR

This study conducts a detailed transit timing variation analysis of OGLE-TR-132b over seven years, finding no significant variations and placing constraints on potential planetary perturbers, thereby confirming the planet's orbital stability.

Contribution

First TTV analysis of OGLE-TR-132b using seven new transits, providing refined planetary parameters and constraining possible additional planets.

Findings

No significant transit timing variations detected.

Refined planetary radius of 1.23 R_J.

No evidence of orbital decay or parameter variation.

Abstract

We report the results of the first transit timing variation (TTV) analysis of the very hot Jupiter OGLE-TR-132b, using ten transits collected over a seven-year period. Our analysis combines three previously published transit light curves with seven new transits, which were observed between February 2008 and May 2009 with the new MagIC-e2V instrument on the Magellan Telescopes in Chile. We provide a revised planetary radius of R_p = 1.23+/-0.07 R_J, which is slightly larger than, but consistent within the errors, of the previously published results. Analysis of the planet-to-star radius ratio, orbital separation, inclination and transit duration reveals no apparent variation in any of those parameters during the time span observed. We also find no sign of transit timing variations larger than -108+/-49 s, with most residuals very close to zero. This allows us to place an upper limit of 5-10 M_Earth for a coplanar, low-eccentricity perturber in either the 2:1 or 3:2 mean-motion resonance with OGLE-TR-132b. We similarly find that the data are entirely consistent with a constant orbital period and there is no evidence for orbital decay within the limits of precision of our data.