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- Title
TASTE IV: Refining ephemeris and orbital parameters for HAT-P-20b and WASP-1b.
- Authors
Granata, V.; Nascimbeni, V.; Piotto, G.; Bedin, L. R.; Borsato, L.; Cunial, A.; Damasso, M.; Malavolta, L.
- Abstract
We present four new light curves of the transiting exoplanets WASP-1b and HAT-P-20b, observed within the TASTE (The Asiago Search for Transit timing variations of Exoplanets) project. We re-analyzed light curves from the literature in a homogeneous way, calculating a refined ephemeris and orbital-physical parameters for both objects. WASP-1b does not show any significant Transit Timing Variation signal at the 120 s level. As for HAT-P-20b, we detected a deviation from our re-estimated linear ephemeris that could be ascribed to the presence of a perturber or, more probably, to a previously unnoticed high level of stellar activity. The rotational period of HAT-P-20 A that we obtained from archival data (Prot ≃14.5 d), combined with its optical variability and strong emission of Ca ii H & K lines, is consistent with a young stellar age (<1 Gyr) and support the hypothesis that stellar activity may be responsible of the measured deviations of the transit times.
- Subjects
EPHEMERIS Time; DETECTION of extrasolar planets; LIGHT curves; ASTRONOMICAL perturbation; STELLAR activity
- Publication
Astronomische Nachrichten, 2014, Vol 335, Issue 8, p797
- ISSN
0004-6337
- Publication type
Article
- DOI
10.1002/asna.201412072