University of Hertfordshire

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From the same journal

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  • 1908.04505v1

    Accepted author manuscript, 755 KB, PDF document

  • R. V. Baluev
  • E. N. Sokov
  • V. Sh Shaidulin
  • I. A. Sokova
  • L. D. Nielsen
  • P. Benni
  • E. M. Schneiter
  • C. Villarreal D'Angelo
  • E. Fernández-Lajús
  • R. P. Di Sisto
  • Ö. Baştürk
  • M. Bretton
  • A. Wunsche
  • V. -P. Hentunen
  • S. Shadick
  • Y. Jongen
  • W. Kang
  • T. Kim
  • E. Pakštienė
  • J. K. T. Qvam
  • C. R. Knight
  • P. Guerra
  • A. Marchini
  • F. Salvaggio
  • R. Papini
  • P. Evans
  • M. Salisbury
  • F. Garcia
  • D. Molina
  • J. Garlitz
  • N. Esseiva
  • Y. Ogmen
  • Yu Karavaev
  • S. Rusov
  • M. A. Ibrahimov
  • R. G. Karimov
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Original languageEnglish
Pages (from-to)1294-1312
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume490
Issue1
Early online date19 Sep 2019
DOIs
Publication statusPublished - Nov 2019

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.

Notes

19 pages, 4 figures, 6 tables; revised manuscript submitted to MNRAS; online-only supplements are in the download archive

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