2019MNRAS.490.4230S

Query : 2019MNRAS.490.4230S

2019MNRAS.490.4230S - Mon. Not. R. Astron. Soc., 490, 4230-4236 (2019/December-2)

Transit timing variations in the WASP-4 planetary system.

SOUTHWORTH J., DOMINIK M., JORGENSEN U.G., ANDERSEN M.I., BOZZA V., BURGDORF M.J., D'AGO G., DIB S., 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. and VON ESSEN C.

Abstract (from CDS):

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.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: activity - stars: fundamental parameters - stars: individual: WASP-4

VizieR on-line data: <Available at CDS (J/MNRAS/490/4230): wasp4all.dat>

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 WASP-12 EB* 06 30 32.7966092352 +29 40 20.263502460   12.14 11.57     G0V 309 1
2 WASP-64 EB* 06 44 27.6050701128 -32 51 30.179289384           ~ 32 1
3 HATS-2 EB* 11 46 57.3702458424 -22 33 46.817348148   14.53 13.62 13.40   ~ 42 1
4 WASP-47b Pl 22 04 48.7261549272 -12 01 07.998743676           ~ 94 1
5 WASP-4b Pl 23 34 15.0857248317 -42 03 41.047972591           ~ 174 1
6 WASP-4 EB* 23 34 15.0857248317 -42 03 41.047972591   13.51 12.48 11.9   G7V 176 1

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