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

• Verfasst von: Mancini, Luigi [VerfasserIn]
• Verfasst von: Schmidt, Robert W. [VerfasserIn]
• Verfasst von: Henning, Thomas [VerfasserIn]
• Titel: Orbital alignment and star-spot properties in the WASP-52 planetary system
• Verf.angabe: 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
• Jahr: 2017
• Umfang: 15 S.
• Fussnoten: Gesehen am 13.02.2019 ; Advance access publication 2016 August 9
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2017
• Band/Heft Quelle: 465(2017), 1, Seite 843-857
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/stw1987
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1564764370

Abstract

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}