J/MNRAS/490/4230 Transiting planet WASP-4b (Southworth+, 2019)
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.,
Von Essen C.
<Mon. Not. R. Astron. Soc., 490, 4230-4236 (2019)>
=2019MNRAS.490.4230S 2019MNRAS.490.4230S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets
Keywords: planetary systems - stars: fundamental parameters - stars: activity -
stars: individual: WASP-4
Abstract:
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 dP/dt=-9.2±1.1ms/yr. 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-4b 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.
Description:
Twenty-two high-quality light curves of transits of the extrasolar
planetary system WASP-4 are presented and used to confirm the
existence of transit timing variations in the system. They were
obtained using the 1.54m Danish Telescope at ESO La Silla, Chile, the
3.6m NTT at ESO La Silla, Chile, and the 40-inch telescope at
Sutherland, South Africa. The filters used were Cousins R for the
Danish and Sutherland telescopes, and SDSS r for the NTT. The
errorbars for each transit have been scaled so the best-fitting model
(obtained using the JKTEBOP code) has a reduced chi-squared value of
1.0.
Objects:
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RA (2000) DE Designation(s)
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23 34 15.06 -42 03 41.1 WASP-4 = 1SWASP J233415.06-420341.1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
wasp4all.dat 52 2946 Differential photometry of WASP-4
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See also:
J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009)
J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009)
J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009)
J/MNRAS/408/1680 : Transiting planetary system WASP-2 (Southworth+, 2010)
J/A+A/527/A8 : Transiting planetary system WASP-7 (Southworth+, 2011)
J/MNRAS/420/2580 : Four transits of HAT-P-13 (Southworth+, 2012)
J/MNRAS/422/3099 : Transits of HAT-P-5 (Southworth+, 2012)
J/MNRAS/426/1338 : Transiting planetary system WASP-17 (Southworth+, 2012)
J/MNRAS/434/1300 : Planetary systems WASP-15, WASP-16 (Southworth+, 2013)
J/MNRAS/444/776 : WASP-24, WASP-25 and WASP-26 (Southworth+, 2014)
J/MNRAS/447/711 : Transiting planetary system WASP-103 (Southworth+, 2015)
J/MNRAS/454/3094 : Transiting planetary system WASP-57 (Southworth+, 2016)
J/MNRAS/457/4205 : WASP-22, WASP-41, WASP-42 and WASP-55 (Southworth+, 2016)
J/AJ/153/191 : Transiting planetary system GJ 1132 (Southworth+, 2017)
Byte-by-byte Description of file: wasp4all.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Tel Telescope used for the observation
8- 16 A9 --- Filt Filter used for the observation,
R_Cousins or r_SDSS
18- 31 F14.6 d BJD Barycentric Julian Date for the midpoint of
observation (TDB)
33- 42 F10.7 mag mag Differential magnitude
44- 52 F9.7 mag e_mag Measurement error of the differential magnitude
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Acknowledgements:
John Southworth, astro.js(at)keele.ac.uk
(End) John Southworth [Keele Univ., UK], Patricia Vannier [CDS] 17-Jan-2020