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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 (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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
Acknowledgements: John Southworth, astro.js(at)keele.ac.uk References: Southworth et al., Paper I 2009MNRAS.396.1023S, Cat. J/MNRAS/396/1023 Southworth et al., Paper II 2009MNRAS.399..287S, Cat. J/MNRAS/399/287 Southworth et al., Paper III 2010MNRAS.408.1680S, Cat. J/MNRAS/408/1680 Southworth et al., Paper IV 2012MNRAS.426.1338S, Cat. J/MNRAS/426/1338 Southworth et al., Paper V 2013MNRAS.434.1300S, Cat. J/MNRAS/434/1300 Southworth et al., Paper VI 2014MNRAS.444..776S, Cat. J/MNRAS/444/776 Southworth et al., Paper VII 2015MNRAS.447..711S, Cat. J/MNRAS/447/711
(End) John Southworth [Keele Univ., UK], Patricia Vannier [CDS] 10-May-2018
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