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Southworth, J, Dominik, M, Jorgensen, UG, Andersen, MI, Bozza, V, Burgdorf, MJ, D'Ago, G, Dib, S, Figuera Jaimes, R, Fujii, YI, Gill, S, Haikala, LK, Hinse, TC, 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 and von Essen, C (2019) Transit timing variations in the WASP-4 planetary system. Monthly Notices of the Royal Astronomical Society, 490 (3). 4176 -4182. ISSN 1365-2966
2019MNRAS.490.4230S.pdf - Published Version
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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: | Article |
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Additional Information: | This is the final published version of the article (version of record). It first appeared online via Oxford University Press at https://doi.org/10.1093/mnras/stz2602 - please refer to any applicable terms of use of the publisher. |
Uncontrolled Keywords: | activity, fundamental parameters, individual: WASP-4 |
Subjects: | Q Science > QB Astronomy > QB799 Stars |
Divisions: | Faculty of Natural Sciences > School of Chemical and Physical Sciences |
Related URLs: | |
Depositing User: | Symplectic |
Date Deposited: | 10 Jan 2020 15:18 |
Last Modified: | 31 Jan 2020 12:20 |
URI: | https://eprints.keele.ac.uk/id/eprint/7481 |