WASP-33: The first δ Scuti exoplanet host star

E. Herrero, J. C. Morales, I. Ribas, R. Naves

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    We report the discovery of photometric oscillations in the host star of the exoplanet WASP-33 b (HD 15082). The data were obtained in the R band in both transit and out-of-transit phases from the 0.3-m telescope and the Montcabrer Observatory and the 0.8-m telescope at the Montsec Astronomical Observatory. Proper fitting and subsequent removal of the transit signal reveals stellar photometric variations with a semi-amplitude of about 1 mmag. The detailed analysis of the periodogram yields a structure of significant signals around a frequency of 21 cyc d-1, which is typical of δ Scuti-type variable stars. An accurate study of the power spectrum reveals a possible commensurability with the planet orbital motion with a factor of 26, but this remains to be confirmed with additional time-series data that will permit the identification of the significant frequencies. These findings make WASP-33 the first transiting exoplanet host star with δ Sct variability and a very interesting candidate to search for star-planet interactions. © 2011 ESO.
    Original languageEnglish
    Article numberL10
    JournalAstronomy and Astrophysics
    Issue number17
    Publication statusPublished - 1 Feb 2011


    • asteroseimology
    • stars: oscillations
    • stars: variables: δ Scuti
    • techniques: photometric


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