The Transiting System GJ1214: High-Precision Defocused Transit Observations and a Search for Evidence of Transit Timing Variation
| Autor: | Harpsøe, K. B. W., Hardis, S., Hinse, T. C., Jørgensen, U. G., Mancini, L., Southworth, J., Alsubai, K. A., Bozza, V., Browne, P., Burgdorf, M. J., Novati, S. Calchi, Dodds, P., Dominik, M., Fang, X. -S., Finet, F., Gerner, T., Gu, S. -H., Hundertmark, M., Kains, N., Kerins, E., Kjeldsen, H., Liebig, C., Lund, M. N., Lundkvist, M., Mathiasen, M., Nesvorný, D., Nikolov, N., Penny, M. T., Proft, S., Rahvar, S., Ricci, D., Sahu, K. C., Scarpetta, G., Schäfer, S., Schönebeck, F., Snodgrass, C., Skottfelt, J., Surdej, J., Tregloan-Reed, J., Wertz, O. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/201219996 |
| Popis: | Aims: We present 11 high-precision photometric transit observations of the transiting super-Earth planet GJ1214b. Combining these data with observations from other authors, we investigate the ephemeris for possible signs of transit timing variations (TTVs) using a Bayesian approach. Methods: The observations were obtained using telescope-defocusing techniques, and achieve a high precision with random errors in the photometry as low as 1mmag per point. To investigate the possibility of TTVs in the light curve, we calculate the overall probability of a TTV signal using Bayesian methods. Results: The observations are used to determine the photometric parameters and the physical properties of the GJ1214 system. Our results are in good agreement with published values. Individual times of mid-transit are measured with uncertainties as low as 10s, allowing us to reduce the uncertainty in the orbital period by a factor of two. Conclusions: A Bayesian analysis reveals that it is highly improbable that the observed transit times is explained by TTV, when compared with the simpler alternative of a linear ephemeris. Comment: Submitted to A&A |
| Databáze: | arXiv |
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