English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Aims: We present 11 high-precision photometric transit observations of thetransiting super-Earth planet GJ1214b. Combining these data with observationsfrom other authors, we investigate the ephemeris for possible signs of transittiming variations (TTVs) using a Bayesian approach.  Methods: The observations were obtained using telescope-defocusingtechniques, and achieve a high precision with random errors in the photometryas low as 1mmag per point. To investigate the possibility of TTVs in the lightcurve, we calculate the overall probability of a TTV signal using Bayesianmethods.  Results: The observations are used to determine the photometric parametersand the physical properties of the GJ1214 system. Our results are in goodagreement with published values. Individual times of mid-transit are measuredwith uncertainties as low as 10s, allowing us to reduce the uncertainty in theorbital period by a factor of two.  Conclusions: A Bayesian analysis reveals that it is highly improbable thatthe observed transit times is explained by TTV, when compared with the simpleralternative of a linear ephemeris.

The Transiting System GJ1214: High-Precision Defocused Transit Observations and a Search for Evidence of Transit Timing Variation