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Orbital alignment and star-spot properties in the WASP-52 planetary system

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We report 13 high-precision light curves of eight transits of the exoplanet WASP-52 b, obtained by using four medium-class telescopes, through different filters, and adopting the defocussing technique. One transit was recorded simultaneously from two different observatories and another one from the...

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Bibliographic Details
Main Authors: Mancini, Luigi (Author) , Schmidt, Robert W. (Author) , Henning, Thomas (Author)
Format: Article (Journal)
Language:English
Published: 2017
In: Monthly notices of the Royal Astronomical Society
Year: 2017, Volume: 465, Issue: 1, Pages: 843-857
ISSN:1365-2966
DOI:10.1093/mnras/stw1987
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1093/mnras/stw1987
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Author Notes:L. Mancini, J. Southworth, G. Raia, J. Tregloan-Reed, P. Mollière, V. Bozza, M. Bretton, I. Bruni, S. Ciceri, G. D'Ago, M. Dominik, T.C. Hinse, M. Hundertmark, U.G. Jørgensen, H. Korhonen, M. Rabus, S. Rahvar, D. Starkey, S. Calchi Novati, R. Figuera Jaimes, Th. Henning, D. Juncher, T. Haugbølle, N. Kains, A. Popovas, R.W. Schmidt, J. Skottfelt, C. Snodgrass, J. Surdej and O. Wertz
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Summary:We report 13 high-precision light curves of eight transits of the exoplanet WASP-52 b, obtained by using four medium-class telescopes, through different filters, and adopting the defocussing technique. One transit was recorded simultaneously from two different observatories and another one from the same site but with two different instruments, including a multiband camera. Anomalies were clearly detected in five light curves and modelled as star-spots occulted by the planet during the transit events. We fitted the clean light curves with the jktebop code, and those with the anomalies with the prism+gemc codes in order to simultaneously model the photometric parameters of the transits and the position, size and contrast of each star-spot. We used these new light curves and some from the literature to revise the physical properties of the WASP-52 system. Star-spots with similar characteristics were detected in four transits over a period of 43 d. In the hypothesis that we are dealing with the same star-spot, periodically occulted by the transiting planet, we estimated the projected orbital obliquity of WASP-52 b to be λ = 3$$_{.}^{\circ}
Item Description:Gesehen am 13.02.2019
Advance access publication 2016 August 9
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stw1987

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