Transit timing variations in the WASP-4 planetary system
SNODGRASS, C.
Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
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Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
Language
en
Article de revue
This item was published in
Monthly Notices of the Royal Astronomical Society: Letters. 2019p. Monthly Notices of the Royal Astronomical Society, Advance Access
Oxford Journals
English 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 ...Read more >
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.Read less <
English Keywords
Astrophysics - Earth and Planetary Astrophysics
Origin
Hal imported