University of Hertfordshire

From the same journal

From the same journal

By the same authors

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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
JournalMonthly Notices of the Royal Astronomical Society
Journal publication date19 Sep 2019
Early online date19 Sep 2019
DOIs
Publication statusE-pub ahead of print - 19 Sep 2019

Abstract

We homogeneously analyse $\sim 3.2\times 10^5$ photometric measurements for $\sim 1100$ transit lightcurves belonging to $17$ exoplanet hosts. The photometric data cover $16$ years 2004--2019 and include amateur and professional observations. Old archival lightcurves 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 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 about $(-7.5\pm 2.2)$~m/s/yr, 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 homogeneus TTV sample, including $10$ ground-based EXPANSION lightcurves 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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