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The spin-orbit angles of the transiting exoplanets WASP-1b, WASP-24b, WASP-38b and HAT-P-8b from Rossiter-McLaughlin observations

Simpson, E. K. ; Pollacco, D. ; Cameron, A. Collier ; Hébrard, G. ; Anderson, D. R. ; Barros, S. C. C. ; Boisse, I. ; Bouchy, F. ; Faedi, F. ; Gillon, M. ; Hebb, L. ; Keenan, F. P. ; Miller, G. R. M. ; Moutou, C. ; Queloz, D. ; Skillen, I. ; Sorensen, P. ; Stempels, H. C. ; Triaud, A. ; Watson, C. A. ; Wilson, P. A.

In: Monthly Notices of the Royal Astronomical Society, 2011, vol. 414, no. 4, p. 3023-3035

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    Titre
    • The spin-orbit angles of the transiting exoplanets WASP-1b, WASP-24b, WASP-38b and HAT-P-8b from Rossiter-McLaughlin observations
    Auteur
    • Simpson, E. K.. Astrophysics Research Centre, School of Mathematics & Physics, Queen's University Belfast, Belfast BT7 1NN
    • Pollacco, D.. Astrophysics Research Centre, School of Mathematics & Physics, Queen's University Belfast, Belfast BT7 1NN
    • Cameron, A. Collier. School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS
    • Hébrard, G.. Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, France
    • Anderson, D. R.. Astrophysics Group, Keele University, Staffordshire ST5 5BG
    • Barros, S. C. C.. Astrophysics Research Centre, School of Mathematics & Physics, Queen's University Belfast, Belfast BT7 1NN
    • Boisse, I.. Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, France
    • Bouchy, F.. Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, France
    • Faedi, F.. Astrophysics Research Centre, School of Mathematics & Physics, Queen's University Belfast, Belfast BT7 1NN
    • Gillon, M.. Université de Liège, Allée du 6 août 17, Sart Tilman, Liège 1, Belgium
    • Hebb, L.. Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA
    • Keenan, F. P.. Astrophysics Research Centre, School of Mathematics & Physics, Queen's University Belfast, Belfast BT7 1NN
    • Miller, G. R. M.. School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS
    • Moutou, C.. Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
    • Queloz, D.. Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
    • Skillen, I.. Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Spain
    • Sorensen, P.. Nordic Optical Telescope, Apartado de Correos 474, E-387 00 Santa Cruz de la Palma, Canary Islands, Spain
    • Stempels, H. C.. Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
    • Triaud, A.. Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
    • Watson, C. A.. Astrophysics Research Centre, School of Mathematics & Physics, Queen's University Belfast, Belfast BT7 1NN
    • Wilson, P. A.. Nordic Optical Telescope, Apartado de Correos 474, E-387 00 Santa Cruz de la Palma, Canary Islands, Spain
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2011, vol. 414, no. 4, p. 3023-3035. Blackwell Publishing Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:295010
    Summary
    We present observations of the Rossiter-McLaughlin effect for the transiting exoplanets WASP-1b, WASP-24b, WASP-38b and HAT-P-8b, and deduce the orientations of the planetary orbits with respect to the host stars' rotation axes. The planets WASP-24b, WASP-38b and HAT-P-8b appear to move in prograde orbits and be well aligned, having sky-projected spin-orbit angles consistent with zero: λ=−4°.7 ± 4°.0, 15°+33−43 and , respectively. The host stars have Teff < 6250 K and conform with the trend of cooler stars having low obliquities. WASP-38b is a massive planet on a moderately long period, eccentric orbit so may be expected to have a misaligned orbit given the high obliquities measured in similar systems. However, we find no evidence for a large spin-orbit angle. By contrast, WASP-1b joins the growing number of misaligned systems and has an almost polar orbit, λ=. It is neither very massive, eccentric nor orbiting a hot host star, and therefore does not share the properties of many other misaligned systems