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

Kumar Mannaday, Vineet; Thakur, Parijat; Southworth, John; Jiang, Ing-Guey; Sahu, D.K.; Mancini, L.; Vaňko, M.; Kundra, Emil; Gajdoš, Pavol; A-thano, Napaporn; Sariya, Devesh P.; Evgeny Griv, Li-Chin Yeh9; Mkrtichian, David; Shlyapnikov, Aleksey

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


Authors

Vineet Kumar Mannaday

Parijat Thakur

Ing-Guey Jiang

D.K. Sahu

L. Mancini

M. Vaňko

Emil Kundra

Pavol Gajdoš

Napaporn A-thano

Devesh P. Sariya

Li-Chin Yeh9 Evgeny Griv

David Mkrtichian

Aleksey Shlyapnikov



Abstract

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.

Journal Article Type Article
Acceptance Date Sep 8, 2022
Online Publication Date Oct 18, 2022
Publication Date Nov 1, 2022
Publicly Available Date Mar 29, 2024
Journal The Astronomical Journal
Print ISSN 0004-6256
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 164
Issue 5
Article Number 198
Pages 1-20
DOI https://doi.org/10.3847/1538-3881/ac91c2
Publisher URL https://iopscience.iop.org/article/10.3847/1538-3881/ac91c2

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