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        Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4

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        Author
        Baluev, R. V.
        Sokov, E. N.
        Jones, H. R. A.
        Shaidulin, V. Sh
        Sokova, I. A.
        Nielsen, L. D.
        Benni, P.
        Schneiter, E. M.
        D'Angelo, C. Villarreal
        Fernández-Lajús, E.
        Sisto, R. P. Di
        Baştürk, Ö.
        Bretton, M.
        Wunsche, A.
        Hentunen, V. -P.
        Shadick, S.
        Jongen, Y.
        Kang, W.
        Kim, T.
        Pakštienė, E.
        Qvam, J. K. T.
        Knight, C. R.
        Guerra, P.
        Marchini, A.
        Salvaggio, F.
        Papini, R.
        Evans, P.
        Salisbury, M.
        Garcia, F.
        Molina, D.
        Garlitz, J.
        Esseiva, N.
        Ogmen, Y.
        Karavaev, Yu
        Rusov, S.
        Ibrahimov, M. A.
        Karimov, R. G.
        Attention
        2299/21746
        Abstract
        We homogeneously analyse ∼3.2 × 10 5 photometric measurements for ∼1100 transit light curves belonging to 17 exoplanet hosts. The photometric data cover 16 years (2004–2019) and include amateur and professional observations. Old archival light curves were reprocessed using up-to-date exoplanetary parameters and empirically debiased limb-darkening models. We also derive self-consistent transit and radial-velocity fits for 13 targets. We confirm the nonlinear transit timing variation (TTV) trend in the WASP-12 data at a high significance, and with a consistent magnitude. However, Doppler data reveal hints of a radial acceleration of about −7.5 ± 2.2 m s −1 yr −1, indicating the presence of unseen distant companions, and suggesting that roughly 10 per cent of the observed TTV was induced via the light-travel (or Roemer) effect. For WASP-4, a similar TTV trend suspected after the recent TESS observations appears controversial and model dependent. It is not supported by our homogeneous TTV sample, including 10 ground-based EXPANSION light curves obtained in 2018 simultaneously with TESS. Even if the TTV trend itself does exist in WASP-4, its magnitude and tidal nature are uncertain. Doppler data cannot entirely rule out the Roemer effect induced by possible distant companions.
        Publication date
        2019-11
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stz2620
        Other links
        http://hdl.handle.net/2299/21746
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