The transiting system GJ1214: high-precision defocused transit observations and a search for evidence of transit timing variation

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.; Calchi Novati, S.; Dodds, P.; Dominik, M.; Fang, X.-S.; Finet, F.; Gerner, T.; Gu, S.-H.; Hundertmark, M.; Jessen-Hansen, J.; 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.

Abstract

Aims. We present 11 high-precision photometric transitobservations of the transiting super-Earth planet GJ 1214 b. 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 1 mmag 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 GJ 1214 system. Our results are in good agreement with published values. Individual times of mid-transit are measured with uncertainties as low as 10 s, 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 caused by a planet in the nominal habitable zone, when compared with the simpler alternative of a linear ephemeris.

Citation

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., Calchi Novati, S., Dodds, P., Dominik, M., Fang, X.-S., Finet, F., Gerner, T., Gu, S.-H., Hundertmark, M., Jessen-Hansen, J., Kains, N., …Wertz, O. (2013). The transiting system GJ1214: high-precision defocused transit observations and a search for evidence of transit timing variation. Astronomy & Astrophysics, 549, Article A10. https://doi.org/10.1051/0004-6361/201219996

• Journal Article Type: Article
• Acceptance Date: Oct 5, 2012
• Online Publication Date: Dec 6, 2012
• Publication Date: 2013-01
• Deposit Date: Jun 16, 2023
• Journal: Astronomy & Astrophysics
• Print ISSN: 0004-6361
• Electronic ISSN: 1432-0746
• Publisher: EDP Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 549
• Article Number: A10
• DOI: https://doi.org/10.1051/0004-6361/201219996
• Keywords: Space and Planetary Science; Astronomy and Astrophysics; planetary systems; stars: individual: GJ1214; methods: statistical; methods: observational; techniques: photometric
• Public URL: https://keele-repository.worktribe.com/output/473149