Volume 526, February 2011
|Number of page(s)||4|
|Published online||12 January 2011|
Letters to the Editor
WASP-33: the first δ Scuti exoplanet host star⋆
Institut de Ciències de l’Espai (CSIC-IEEC), Campus UAB, Facultat de
Torre C5 parell, 2a pl,
e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org
2 Observatori Montcabrer, C/Jaume Balmes, 24, Cabrils, Spain
Received: 5 October 2010
Accepted: 18 December 2010
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.
Key words: stars: variables:δScuti / stars: oscillations / techniques: photometric / asteroseimology
Photometric data is only available in electronic forrm at CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/526/L10
© ESO, 2011
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