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Transit timing variations in the WASP-4 planetary system*

Southworth, John; Dominik, M; Jørgensen, U G; Andersen, M I; Bozza, V; Burgdorf, M J; D’Ago, G; Dib, S; Jaimes, R Figuera; Fujii, Y I; Gill, S; Haikala, L K; Hinse, T C; Hundertmark, M; Khalouei, E; Korhonen, H; Longa-Peña, P; Mancini, L; Peixinho, N; Rabus, M; Rahvar, S; Sajadian, S; Skottfelt, J; Snodgrass, C; Spyratos, P; Tregloan-Reed, J; Unda-Sanzana, E and von Essen, C (2019). Transit timing variations in the WASP-4 planetary system*. Monthly Notices of the Royal Astronomical Society, article no. stz2602.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1093/mnras/stz2602
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Abstract

Abstract Transits in the planetary system WASP-4 were recently found to occur 80 s 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 dP/dt = −9.2 ± 1.1 ms yr−1. We rule out instrumental issues, stellar activity and the Applegate mechanism as possible causes. The light-time effect is also not favoured due to the non-detection of changes in the systemic velocity. Orbital decay and apsidal precession are plausible but unproven. WASP-4 b is only the third hot Jupiter known to show transit timing variations to high confidence. We discuss a variety of observations of this and other planetary systems that would be useful in improving our understanding of WASP-4 in particular and orbital decay in general.

Item Type: Journal Item
Copyright Holders: 2019 The Authors
ISSN: 1365-2966
Keywords: planetary systems, stars: fundamental parameters, stars: activity, stars: individual: WASP-4
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 66973
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 30 Sep 2019 08:53
Last Modified: 13 Oct 2019 09:49
URI: http://oro.open.ac.uk/id/eprint/66973
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