Revisiting the Transit Timing Variations in the TrES-3 and Qatar-1 Systems with TESS Data

We present and analyze 58 transit light curves of TrES-3b and 98 transit light curves of Qatar-1b, observed by the Transiting Exoplanet Survey Satellite, plus two transit light curves of Qatar-1b, observed by us, using a ground-based 1.23 m telescope. These light curves are combined with the best-qu...

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Bibliographic Details
Published in:The Astronomical journal 2022-11, Vol.164 (5), p.198
Main Authors: Mannaday, Vineet Kumar, Thakur, Parijat, Southworth, John, Jiang, Ing-Guey, Sahu, D. K., Mancini, L., Vaňko, M., Kundra, Emil, Gajdoš, Pavol, A-thano, Napaporn, Sariya, Devesh P., Yeh, Li-Chin, Griv, Evgeny, Mkrtichian, David, Shlyapnikov, Aleksey
Format: Article
Language:English
Subjects:
Acceleration
Astronomy
Ephemerides
Exoplanets
Extrasolar planets
Gas giant planets
Hot Jupiters
Light
Light curve
Line of sight
Orbit decay
Planet detection
Radial velocity
Tidal interaction
Transit
Transit photometry
Transit timing variation method
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Summary:We present and analyze 58 transit light curves of TrES-3b and 98 transit light curves of Qatar-1b, observed by the Transiting Exoplanet Survey Satellite, plus two transit light curves of Qatar-1b, observed by us, using a ground-based 1.23 m telescope. These light curves are combined with the best-quality light curves taken from the Exoplanet Transit Database and the literature. The precisely determined midtransit times from these light curves enable us to obtain the refined orbital ephemerides, with improved precision, for both hot Jupiters. From the timing analysis, we find indications of the presence of transit timing variations (TTVs) in both systems. Since the observed TTVs are unlikely to be short-term and periodic, the possibility of additional planets in orbits close to TrES-3b and Qatar-1b is ruled out. The possible causes of long-term TTVs, such as orbital decay, apsidal precession, the Applegate mechanism, and line-of-sight acceleration, are also examined. However, none of these possibilities are found to explain the observed TTV of TrES-3b. In contrast to this, line-of-sight acceleration appears to be a plausible explanation for the observed TTV of Qatar-1b. In order to confirm these findings, further high-precision transit and radial velocity observations of both systems would be worthwhile.
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ac91c2