SOUTHWORTH, John; DOMINIK, M.; JØRGENSEN, U. G.; ANDERSEN, M. I.; BOZZA, V.; BURGDORF, M. J.; D'AGO, G.; DIB, Sami; FIGUERA JAIMES, R.; FUJII, Y. I.; GILL, S.; HAIKALA, L. K.; HINSE, T. C.; HUNDERTMARK, M.; KHALOUEI, E.; KORHONEN, H.; LONGA-PENA, P.; MANCINI, L.; PEIXINHO, N.; RABUS, M.; RAHVAR, S.; SAJADIAN, S.; SKOTTFELT, J.; SNODGRASS, C.; SPYRATOS, P.; TREGLOAN-REED, J.; UNDA-SANZANA, E.; VON ESSEN, C.

doi:10.1093/mnras/stz2602

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SOUTHWORTH, John

DOMINIK, M.

JØRGENSEN, U. G.
University of Copenhagen = Københavns Universitet [UCPH]

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Monthly Notices of the Royal Astronomical Society: Letters. 2019p. Monthly Notices of the Royal Astronomical Society, Advance Access

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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.< Leer menos

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Astrophysics - Earth and Planetary Astrophysics

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Transit timing variations in the WASP-4 planetary system

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