TASTE. III. A homogeneous study of transit time variations in WASP-3b

The TASTE project is searching for low-mass planets with the Transit Timing Variation (TTV) technique, by gathering high-precision, short-cadence light curves for a selected sample of transiting exoplanets. It has been claimed that the "hot Jupiter" WASP-3b could be perturbed by a second p...

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Bibliographic Details
Published in:arXiv.org 2012-10
Main Authors: Nascimbeni, V, Cunial, A, Murabito, S, Sada, P V, Aparicio, A, Piotto, G, Bedin, L R, Milone, A P, Rosenberg, A, Borsato, L, Damasso, M, Granata, V, Malavolta, L
Format: Article
Language:English
Subjects:
Binary stars
Eclipsing binary stars
Extrasolar planets
Gas giant planets
Light curve
Orbits
Periodic variations
Physical properties
Planet detection
Taste
Telescopes
Transit
Transit time
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Summary:The TASTE project is searching for low-mass planets with the Transit Timing Variation (TTV) technique, by gathering high-precision, short-cadence light curves for a selected sample of transiting exoplanets. It has been claimed that the "hot Jupiter" WASP-3b could be perturbed by a second planet. Presenting eleven new light curves (secured at the IAC80 and UDEM telescopes) and re-analyzing thirty-eight archival light curves in a homogeneous way, we show that new data do not confirm the previously claimed TTV signal. However, we bring evidence that measurements are not consistent with a constant orbital period, though no significant periodicity can be detected. Additional dynamical modeling and follow-up observations are planned to constrain the properties of the perturber or to put upper limits to it. We provide a refined ephemeris for WASP-3b and improved orbital/physical parameters. A contact eclipsing binary, serendipitously discovered among field stars, is reported here for the first time.
ISSN:2331-8422
DOI:10.48550/arxiv.1210.3045