SIMBAD references

2009ApJ...700.1078G - Astrophys. J., 700, 1078-1085 (2009/August-1)

A transit timing analysis of nine rise light curves of the exoplanet system TrES-3.

GIBSON N.P., POLLACCO D., SIMPSON E.K., BARROS S., JOSHI Y.C., TODD I., KEENAN F.P., SKILLEN I., BENN C., CHRISTIAN D., HRUDKOVA M. and STEELE I.A.

Abstract (from CDS):

We present nine newly observed transits of TrES-3, taken as part of a transit timing program using the RISE instrument on the Liverpool Telescope. A Markov-Chain Monte Carlo analysis was used to determine the planet-star radius ratio and inclination of the system, which were found to be Rp/R {*}= 0.1664+0.0011–0.0018 and i = 81.73+0.13–0.04, respectively, consistent with previous results. The central transit times and uncertainties were also calculated, using a residual-permutation algorithm as an independent check on the errors. A re-analysis of eight previously published TrES-3 light curves was conducted to determine the transit times and uncertainties using consistent techniques. Whilst the transit times were not found to be in agreement with a linear ephemeris, giving χ2 = 35.07 for 15 degrees of freedom, we interpret this to be the result of systematics in the light curves rather than a real transit timing variation. This is because the light curves that show the largest deviation from a constant period either have relatively little out-of-transit coverage or have clear systematics. A new ephemeris was calculated using the transit times and was found to be Tc(0) = 2454632.62610 ±0.00006 HJD and P = 1.3061864±0.0000005 days. The transit times were then used to place upper mass limits as a function of the period ratio of a potential perturbing planet, showing that our data are sufficiently sensitive to have probed sub-Earth mass planets in both interior and exterior 2:1 resonances, assuming that the additional planet is in an initially circular orbit.

Abstract Copyright:

Journal keyword(s): methods: data analysis - planetary systems - stars: individual: TrES-3 - techniques: photometric

Simbad objects: 4

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2023.01.27-18:37:54

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