J/MNRAS/457/4205 WASP-22, WASP-41, WASP-42, WASP-55 (Southworth+, 2016)
High-precision photometry by telescope defocussing.
VIII. WASP-22, WASP-41, WASP-42 and WASP-55.
Southworth J., Tregloan-reed J., Andersen M.I., Calchi Novati S.,
Ciceri S., Colque J.P., D'ago G., Dominik M., Evans D.F., Gu S.-H.,
Herrera-Cordova A., Hinse T.C., Jorgensen U.G., Juncher D., Kuffmeier M.,
Mancini L., Peixinho N., Popovas A., Rabus M., Skottfelt J., Tronsgaard R.,
Unda-Sanzana E., Wang X.-B., Wertz O., Alsubai K.A., Andersen J.M.,
Bozza V., Bramich D.M., Burgdorf M., Damerdji Y., Diehl C., Elyiv A.,
Figuera Jaimes R., Haugbolle T., Hundertmark M., Kains N., Kerins E.,
Korhonen H., Liebig C., Mathiasen M., Penny M.T., Rahvar S., Scarpetta G.,
Schmidt R.W., Snodgrass C., Starkey D., Surdej J., Vilela C., Von Essen C.,
Wang Y.
<Mon. Not. R. Astron. Soc., 457, 4205-4217 (2016)>
=2016MNRAS.457.4205S 2016MNRAS.457.4205S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Exoplanets ; Photometry
Keywords: planetary systems - stars: fundamental parameters -
stars: individual: WASP-22, WASP-41, WASP-42
Abstract:
We present 13 high-precision and four additional light curves of four
bright southern-hemisphere transiting planetary systems: WASP-22,
WASP-41, WASP-42 and WASP-55. In the cases of WASP-42 and WASP-55,
these are the first follow-up observations since their discovery
papers. We present refined measurements of the physical properties and
orbital ephemerides of all four systems. No indications of transit
timing variations were seen. All four planets have radii inflated
above those expected from theoretical models of gas-giant planets;
WASP-55 b is the most discrepant with a mass of 0.63MJup and a
radius of 1.34RJup. WASP-41 shows brightness anomalies during
transit due to the planet occulting spots on the stellar surface. Two
anomalies observed 3.1d apart are very likely due to the same spot. We
measure its change in position and determine a rotation period for the
host star of 18.6±1.5d, in good agreement with a published
measurement from spot-induced brightness modulation, and a
sky-projected orbital obliquity of λ=6±11°. We conclude
with a compilation of obliquity measurements from spot-tracking
analyses and a discussion of this technique in the study of the
orbital configurations of hot Jupiters.
Description:
17 light curves of transits of the extrasolar planetary systems
WASP-22, WASP-41, WASP-42 and WASP-55 are presented. 13 of the light
curves were obtained using the Danish 1.54m telescope at ESO La Silla,
Chile, in the Bessell R or Bessell I passbands. The other 4 light
curves were obtained using the 84cm telescope at Observatorio Cerro
Armazones, Chile, using either an R filter or no filter. 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:
----------------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------------
03 31 16.32 -23 49 10.9 WASP-22 = 1SWASP J033116.32-234911.0
12 42 28.50 -30 38 23.5 WASP-41 = 1SWASP J124228.50-303823.5
12 51 55.62 -42 04 25.2 WASP-42 = 1SWASP J125155.62-420425.2
13 35 01.94 -17 30 12.7 WASP-55 = 1SWASP J133501.94-173012.7
----------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
wasp22.dat 47 1252 Photometry of WASP-22
wasp41.dat 47 910 Photometry of WASP-41
wasp42.dat 47 468 Photometry of WASP-42
wasp55.dat 47 540 Photometry of WASP-55
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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)
Byte-by-byte Description of file: wasp22.dat wasp41.dat wasp42.dat wasp55.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Tel Telescope used for the observations
8- 11 A4 --- Filt [I R none] Filter used for the observation
13- 26 F14.6 d BJD Barycentric JD for the midpoint of
observation (TDB)
28- 37 F10.7 mag dmag Differential magnitude in that filter
39- 47 F9.7 mag e_dmag Measurement error of the differential magnitude
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Acknowledgements:
John Southworth, astro.js(at)keele.ac.uk
References:
Southworth et al., Paper I 2009MNRAS.396.1023S 2009MNRAS.396.1023S, Cat. J/MNRAS/396/1023
Southworth et al., Paper II 2009MNRAS.399..287S 2009MNRAS.399..287S, Cat. J/MNRAS/399/287
Southworth et al., Paper III 2010MNRAS.408.1680S 2010MNRAS.408.1680S, Cat. J/MNRAS/408/1680
Southworth et al., Paper IV 2012MNRAS.426.1338S 2012MNRAS.426.1338S, Cat. J/MNRAS/426/1338
Southworth et al., Paper V 2013MNRAS.434.1300S 2013MNRAS.434.1300S, Cat. J/MNRAS/434/1300
Southworth et al., Paper VI 2014MNRAS.444..776S 2014MNRAS.444..776S, Cat. J/MNRAS/444/776
Southworth et al., Paper VII 2015MNRAS.447..711S 2015MNRAS.447..711S, Cat. J/MNRAS/447/711
(End) John Southworth [Keele Univ., UK], Patricia Vannier [CDS] 10-May-2018