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.

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

Full paper

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Number of rows : 6

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2023	#notes
1	WASP-12	**	06 30 32.7966092352	+29 40 20.263502460	12.14	11.57		G0V	287	2
2	WASP-64	V*	06 44 27.6050701128	-32 51 30.179289384				~	28	1
3	HATS-2	*	11 46 57.3702458424	-22 33 46.817348148	14.53	13.62	13.40	~	35	1
4	WASP-47b	Pl	22 04 48.7262032385	-12 01 08.000987005				~	81	1
5	WASP-4b	Pl	23 34 15.0857248317	-42 03 41.047972591				~	159	1
6	WASP-4	PM*	23 34 15.0857248317	-42 03 41.047972591	13.51	12.48	11.9	G7V	163	1

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