Detection of orbital parameter changes in the TrES-2 exoplanet ?

Abstract

We report a possible change in the orbit parameters of the TrES-2 exoplanet. With a period of 2.470621 days, the TrES-2 exoplanet exhibits almost "grazing" transits 110.4 minutes duration as measured in 2006 by Holman and collaborators. We observed two transits of TrES-2 in 2008 using the 1.2m Oskar-Luhning telescope (OLT) of Hamburg observatory employing CCD photometry in an i-band and a near to R-band filter. A careful light curve analysis including a re-analysis of the 2006 observations shows that the current transit duration has shortened since 2006 by ~ 3.16 minutes. Although the new observations were taken in a different filter we argue that the observed change in transit duration time cannot be attributed to the treatment of limb darkening. If we assume the stellar and planetary radii to be constant, a change in orbit inclination is the most likely cause of this change in transit duration.

5 pages, 8 figures

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• Improving Stellar and Planetary Parameters of Transiting Planet Systems: The Case of TrES-2
• Using Stellar Limb-Darkening to Refine the Properties of HD 209458b
• TrES-2: The First Transiting Planet in the Kepler Field
• Transiting planets - lightcurve analysis for eccentric orbits
• The Transit Light Curve Project. VI. Three Transits of the Exoplanet TrES-2
• Transit Photometry of the Core-Dominated Planet HD 149026b

Cited by in corpus (16)

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• Homogeneous studies of transiting extrasolar planets. III. Additional planets and stellar models
• TESS Transit Timing of Hundreds of Hot Jupiters
• Photometrically derived masses and radii of the planet and star in the TrES-2 system
• Extrasolar Planet Transits Observed at Kitt Peak National Observatory
• HAT-P-14b: A 2.2 Jupiter-mass exoplanet transiting a bright F star
• Atmosphere and Spectral Models of the Kepler-Field Planets HAT-P-7b and TrES-2
• System parameters, transit times and secondary eclipse constraints of the exoplanet systems HAT-P-4, TrES-2, TrES-3 and WASP-3 from the NASA EPOXI Mission of Opportunity
• Analysis of Kepler's short-cadence photometry for TrES-2b
• Transit timing analysis of the exoplanets TrES-1 and TrES-2
• Characterizing Transiting Extrasolar Planets with Narrow-Band Photometry and GTC/OSIRIS
• Transit timing of TrES-2: a combined analysis of ground- and space-based photometry
• A consistent analysis of three years of ground- and space-based photometry of TrES-2
• Multi-band transit observations of the TrES-2b exoplanet
• Evidence of Long-Term Period Variations in the Exoplanet Transit Database (ETD)
• On the Apparent Orbital Inclination Change of the Extrasolar Transiting Planet TrES-2b