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WASP-44b, WASP-45b and WASP-46b: three short-period, transiting extrasolar planets

Anderson, D. R. ; Collier Cameron, A. ; Gillon, M. ; Hellier, C. ; Jehin, E. ; Lendl, M. ; Maxted, P. F. L. ; Queloz, D. ; Smalley, B. ; Smith, A. M. S. ; Triaud, A. H. M. J. ; West, R. G. ; Pepe, F. ; Pollacco, D. ; Ségransan, D. ; Todd, I. ; Udry, S.

In: Monthly Notices of the Royal Astronomical Society, 2012, vol. 422, no. 3, p. 1988-1998

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    Titre
    • WASP-44b, WASP-45b and WASP-46b: three short-period, transiting extrasolar planets
    Auteur
    • Anderson, D. R.. Astrophysics Group, Keele University, Staffordshire ST5 5BG
    • Collier Cameron, A.. SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, Fife KY16 9SS
    • Gillon, M.. Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 17, Bat. B5C, Liège 1, Belgium
    • Hellier, C.. Astrophysics Group, Keele University, Staffordshire ST5 5BG
    • Jehin, E.. Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 17, Bat. B5C, Liège 1, Belgium
    • Lendl, M.. Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
    • Maxted, P. F. L.. Astrophysics Group, Keele University, Staffordshire ST5 5BG
    • Queloz, D.. Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
    • Smalley, B.. Astrophysics Group, Keele University, Staffordshire ST5 5BG
    • Smith, A. M. S.. Astrophysics Group, Keele University, Staffordshire ST5 5BG
    • Triaud, A. H. M. J.. Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
    • West, R. G.. Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH
    • Pepe, F.. Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
    • Pollacco, D.. Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN
    • Ségransan, D.. Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
    • Todd, I.. Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN
    • Udry, S.. Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2012, vol. 422, no. 3, p. 1988-1998. Blackwell Publishing Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:299533
    Summary
    We report the discovery of three extrasolar planets that transit their moderately bright (mV= 12-13) host stars. WASP-44b is a 0.89-MJup planet in a 2.42-day orbit around a G8V star. WASP-45b is a 1.03-MJup planet which passes in front of the limb of its K2V host star every 3.13 days. Weak Ca ii H&K emission seen in the spectra of WASP-45 suggests that the star is chromospherically active. WASP-46b is a 2.10-MJup planet in a 1.43-day orbit around a G6V star. Rotational modulation of the light curves of WASP-46 and weak Ca ii H&K emission in its spectra show the star to be photospherically and chromospherically active. We imposed circular orbits in our analyses as the radial-velocity data are consistent with (near-)circular orbits, as could be expected from both empirical and tidal-theory perspectives for such short-period, ∼Jupiter-mass planets. We discuss the impact of fitting for eccentric orbits for such planets when not supported by the data. The derived planetary and stellar radii depend on the fitted eccentricity and these parameters inform intense theoretical efforts concerning tidal circularization and heating, bulk planetary composition and the observed systematic errors in planetary and stellar radii. As such, we recommend exercising caution in fitting the orbits of short-period, ∼Jupiter-mass planets with an eccentric model when there is no evidence of non-circularity