Southworth, J, Tregloan-Reed, J, Andersen, MI, Novati, SC, Ciceri, S, Colque, JP, D'Ago, G, Dominik, M, Evans, DF, Gu, S-H, Herrera-Cordova, A, Hinse, TC, Jorgensen, UG, 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, KA, Andersen, JM, Bozza, V, Bramich, DM, Burgdorf, M, Damerdji, Y, Diehl, C, Elyiv, A, Jaimes, RF, Haugbolle, T, Hundertmark, M, Kains, N, Kerins, E, Korhonen, H, Liebig, C, Mathiasen, M, Penny, MT, Rahvar, S, Scarpetta, G, Schmidt, RW, Snodgrass, C, Starkey, D, Surdej, J, Vilela, C, von Essen, C and Wang, Y (2016) High-precision photometry by telescope defocussing - VIII. WASP-22, WASP-41, WASP-42 and WASP-55. Monthly Notices of the Royal Astronomical Society, 457 (4). 4205 - 4217. ISSN 1365-2966

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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 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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: stars, fundamental parameters, WASP-22, WASP-41, WASP-42, WASP-55, planetary systems
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 14 Jun 2016 09:36
Last Modified: 15 Apr 2019 09:10

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