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Journal Articles Monthly Notices of the Royal Astronomical Society: Letters Year : 2019

Transit timing variations in the WASP-4 planetary system

John Southworth
M. Dominik
  • Function : Author
V. Bozza
  • Function : Author
M. J. Burgdorf
  • Function : Author
G. d'Ago
  • Function : Author
R. Figuera Jaimes
  • Function : Author
Y. I. Fujii
  • Function : Author
S. Gill
  • Function : Author
T. C. Hinse
  • Function : Author
M. Hundertmark
  • Function : Author
E. Khalouei
  • Function : Author
H. Korhonen
  • Function : Author
P. Longa-Pena
  • Function : Author
L. Mancini
  • Function : Author
S. Rahvar
  • Function : Author
  • PersonId : 880946
S. Sajadian
  • Function : Author
J. Skottfelt
  • Function : Author
P. Spyratos
  • Function : Author
J. Tregloan-Reed
  • Function : Author
C. von Essen
  • Function : Author

Abstract

Transits in the planetary system WASP-4 were recently found to occur 80s earlier than expected in observations from the TESS satellite. We present 22 new times of mid-transit that confirm the existence of transit timing variations, and are well fitted by a quadratic ephemeris with period decay (-1.95 +/- 0.23) x 10^{-10} d per orbital period. We rule out instrumental issues, stellar activity, the Applegate mechanism and tidal effects as possible causes. The light-time effect is also not favoured. Apsidal precession is plausible but unproven. WASP-4b is only the third transiting hot Jupiter known to show transit timing variations to high confidence.

Dates and versions

hal-02282388 , version 1 (10-09-2019)

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Cite

John Southworth, M. Dominik, U. G. Jørgensen, M. I. Andersen, V. Bozza, et al.. Transit timing variations in the WASP-4 planetary system. Monthly Notices of the Royal Astronomical Society: Letters, 2019, pp.Monthly Notices of the Royal Astronomical Society, Advance Access. ⟨10.1093/mnras/stz2602⟩. ⟨hal-02282388⟩
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