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High-precision photometry by telescope defocussing - VIII. WASP-22, WASP-41, WASP-42 and WASP-55

Southworth, John; 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.; Jørgensen, 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.; Haugbølle, 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.

High-precision photometry by telescope defocussing - VIII. WASP-22, WASP-41, WASP-42 and WASP-55 Thumbnail


J. Tregloan-Reed

M.I. Andersen

S. Calchi Novati

S. Ciceri

J.P. Colque

G. D'Ago

M. Dominik

D.F. Evans

S.-H. Gu

A. Herrera-Cordova

T.C. Hinse

U.G. Jørgensen

D. Juncher

M. Kuffmeier

L. Mancini

N. Peixinho

A. Popovas

M. Rabus

J. Skottfelt

R. Tronsgaard

E. Unda-Sanzana

X.-B. Wang

O. Wertz

K.A. Alsubai

J.M. Andersen

V. Bozza

D.M. Bramich

M. Burgdorf

Y. Damerdji

C. Diehl

A. Elyiv

R. Figuera Jaimes

T. Haugbølle

M. Hundertmark

N. Kains

E. Kerins

H. Korhonen

C. Liebig

M. Mathiasen

M.T. Penny

S. Rahvar

G. Scarpetta

R.W. Schmidt

C. Snodgrass

D. Starkey

J. Surdej

C. Vilela

C. von Essen

Y. Wang


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 0.63?MJup and a radius of 1.34?RJup. WASP-41 shows brightness anomalies during transit due to the planet occulting spots on the stellar surface. Two anomalies observed 3.1 d 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 ± 1.5 d, in good agreement with a published measurement from spot-induced brightness modulation, and a sky-projected orbital obliquity of ? = 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.

Journal Article Type Article
Acceptance Date Feb 1, 2016
Online Publication Date Jan 8, 2016
Publication Date Apr 21, 2016
Publicly Available Date May 26, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 457
Issue 4
Pages 4205 - 4217
Keywords stars, fundamental parameters, WASP-22, WASP-41, WASP-42, WASP-55, planetary systems
Publisher URL