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Refined Ephemeris for Four Hot Jupiters Using Ground-Based and TESS Observations

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Abstract

WASP-12 b, WASP-33 b, WASP-36 b, and WASP-46 b are four transiting hot Jupiters, which we have studied. These systems’ light curves were derived from observations made by the Transiting Light Exoplanet Survey Satellite (TESS) and some ground-based telescopes. We used Exofast-v1 to model these light curves and calculate mid-transit times. Also, we plotted TTV diagrams for them using derived mid-transit times and those available within the literature. O–C analysis of these timings enables us to refine the linear ephemeris of four systems. We measured WASP-12’s tidal quality factor based on adding TESS data as \(Q^{\prime}_{*}=(2.13\pm 0.29)\times 10^{5}\) . According to the analysis, the orbital period of the WASP-46 b system is increasing. The WASP-36 b and WASP-33 b systems have not shown any obvious quadratic trend in their TTV diagrams. The increase in their period is most likely due to inaccurate liner ephemeris that has increased over time. So, more observations are needed to evaluate whether or not there is an orbital decay in the WASP-36 b and WASP-33 b systems.

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  1. https://docs.lightkurve.org/.

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ACKNOWLEDGMENTS

This manuscript was prepared to cooperate with the International Occultation Timing Association Middle East section (IOTA/ME) and Tafresh University, Tafresh, Iran. This group activity happened during the Eighth Summer School of Astronomy, held between August 21–26, 2020. We give our special thanks to Dr. Ozgur Basturk for his scientific cooperation. Furthermore, thanks to Dr. Somayeh Khakpash for making some corrections to the text. Authors thanks Tafresh University for the great support of project no. 11/903 that made doing this scientific activity possible.

This study was made possible by the scientific cooperation of the Astronomical Society of the Czech Republic (ETD section) and observational information on its website (http://var2.astro.cz). The Czech Astronomical Society (found in 1924) is an organization coordinating research and observing variable stars and exoplanets in the Czech Republic. Members of this organization are mostly advanced amateur and professional astronomers. We thank the observers (S. Irwin, R. Zambelli, R. Naves, P. Cagas, A. Ayiomamitis, A. Marchini, K. Ivanov, S. Shadic, D. Molina, M. Bretton, N. Esseiva, M. Vrašták, W. Kang, C. Arena, F. Campos, V. Perroud, Y. Jongen, G. Montanari, V. Hentunen, T. Mollier, T. Scarmato, E. Herrero, L. Brát, G. Corfini, J. Gaitan, J. Lopesino, F. Garcia, B. Guvenen, N. Sebastian, P. Benni, J.L. Salto, M. Raetz, A. Wunsche, G. Marino, P. Pintr, Tan TG, F. Emering, M. Zibar, J. Gonzalez, P. Herbert, A. Carreño, F. Scaggiante, D. Zardin, P. Guerra, S. Ferratfiat, I. Curtis, T. Sauer, C. Colazo, R. Melia, M. Schneiter, E. Fernández-Lajús, P. Romina, Di Sisto, M. Mašek, K. Hoňková, J. Juryšek, C. Villarreal, C. Quiñones, P. Evans, CAAT—Centro Astronomico del Alto Turia).

Furthermore, the assistance provided by the TRAPPIST team and EulerCam includes Michael Gillon (University of Liege, Belgium), Laetitia Delrez (University of Liege, Belgium), Monika Lendl (University of Geneva, Switzerland), Emmanuel Jehin (University of Liege, Belgium), Pierre Magain (University of Liege, Belgium), Cyrielle Opitom (University of Edinburgh, UK) was greatly appreciated for their scientific cooperation in this project.

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Authors and Affiliations

  1. The International Occultation Timing Association Middle East Section, Gonbad, Iran

    F. Davoudi, P. MirshafieKhozani, E. Paki, M. Roshana, A. MazidabadiFarahani, F. Ahangarani Farahani, F. Nasrollahzadeh & A. Poro

  2. Astronomy Department of the Raderon Lab., Burnaby, BC, Canada

    F. Davoudi & A. Poro

  3. The Eight IOTA/ME Summer School of Astronomy, Tafresh University, Tafresh, Iran

    F. Davoudi, P. MirshafieKhozani, E. Paki, M. Roshana, F. Hasheminasab, A. MazidabadiFarahani, F. Ahangarani Farahani, T. Farjadnia, F. Nasrollahzadeh, S. Rezvanpanah, S. M. Mousavi, R. Foroughi, A. Poro & A. Ghalee

  4. Department of Physics, Tafresh University, P.O. Box 39518-79611, Tafresh, Iran

    A. Ghalee

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  1. F. Davoudi
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Correspondence to A. Poro.

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Davoudi, F., MirshafieKhozani, P., Paki, E. et al. Refined Ephemeris for Four Hot Jupiters Using Ground-Based and TESS Observations. Astron. Lett. 47, 638–650 (2021). https://doi.org/10.1134/S1063773721090024

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