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Ephemeris Updates for Seven Selected Hatnet Survey Transiting Exoplanets

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We refined the ephemeris of seven transiting exoplanets HAT-P-6b, HAT-P-12b, HAT-P-18b, HAT-P-22b, HAT-P-32b, HAT-P-33b, and HAT-P-52b. We observed 11 transits from eight observatories in different filters for HAT-P-6b and HAT-P-32b. Also, the Exoplanet Transit Database (ETD) observations for each of the seven exoplanets were analyzed, and the light curves of five systems were studied using Transiting Exoplanet Survey Satellite (TESS) data. We used Exofast-v1 to simulate these ground- and space-based light curves and estimate mid-transit times. We obtained a total of 11, 175 and 67 mid-transit times for these seven exoplanets from our observations, ETD and TESS data, respectively, along with 155 midtransit times from the literature. Then, we generated transit timing variation (TTV) diagrams for each using derived mid-transit times as well as those found in the literature. The systems’ linear ephemeris was then refined and improved using the Markov Chain Monte Carlo (MCMC) method. All of the studied exoplanets, with the exception of the HAT-P-12b system, displayed an increasing trend in the orbital period in the TTV diagrams.

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Authors and Affiliations

  1. Astronomy Department of the Raderon AI Lab, Burnaby, BC., Canada

    A. Poro

  2. BSN Project, Transiting Exoplanets Department, Tehran, Iran

    F. A. Farahani, E. Jahangiri, A. Sarostad, M. Gozarandi, M. Haghgou, F. Abolhassani & A. Fakhrabadi

  3. Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran

    M. Haghgou

  4. Observatoire de Vaison-La-Romaine, Departementale 51, 84110, Vaison-La-Romaine, France

    Y. Jongen

  5. Observatoire des Baronnies Provençales, Route de Nyons, F-05150, Moydans, France

    A. Wünsche

  6. Observatorio Montcabrer, Cabrils, Spain

    R Naves

  7. Observatori Astronòmic Albanyà, Camí de Bassegoda S/N, E-17733, Albanyà, Girona, Spain

    P. Guerra

  8. University of Siena - Astronomical Observatory, Via Roma 56, 53100, Siena, Italy

    A. Marchini

  9. British Astronomical Association, 25 Farringdon Street, London, EC4A 4AB, England

    M. Salisbury

  10. Czech Astronomical Society, Frièova 298, 251 65, Ondøejov, Czech Republic

    R. Ehrenberger

  11. Taurus Hill Observatory, 79480, Varkaus, Finland

    V-P. Hentunen

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  1. A. Poro
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Corresponding author

Correspondence to A. Poro.

Additional information

Published in Astrofizika, Vol. 66, No. 3, pp. 353-371 (August 2023).

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Poro, A., Farahani, F.A., Jahangiri, E. et al. Ephemeris Updates for Seven Selected Hatnet Survey Transiting Exoplanets. Astrophysics 66, 324–343 (2023). https://doi.org/10.1007/s10511-023-09794-y

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  • DOI: https://doi.org/10.1007/s10511-023-09794-y

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