J/A+A/526/L10 Transits of WASP-33 (Herrero+, 2011)
WASP-33: the first delta Scuti exoplanet host star.
Herrero E., Morales J.C., Ribas I., Naves R.
<Astron. Astrophys. 526, L10 (2011)>
=2011A&A...526L..10H 2011A&A...526L..10H
ADC_Keywords: Stars, variable ; Planets ; Photometry
Keywords: stars: variables: delta Scuti - stars: oscillations -
techniques: photometric - asteroseimology
Abstract:
We report the discovery of photometric oscillations in the host star
of the exoplanet WASP-33b (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 1mmag.
The detailed analysis of the periodogram yields a structure of
significant signals around a frequency of 21 cyc per day, which is
typical of delta 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 delta Scutt variability and a very
interesting candidate to search for star-planet interactions.
Description:
This tables list the R-band photometric follow-up of WASP-33 from the
Montsec Observatory used in this paper and also the out-of-transit
follow-up photometry taken from Montcabrer Observatory. All the other
data used in the paper (from other authors) is available at the
Exoplanet Transit Database (ETD, http://var2.astro.cz/ETD).
Objects:
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RA (2000) DE Designation(s)
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02 26 51.1 +37 33 02 WASP-33 = HD 15082
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 29 121 Out of transit data on 07/09/2010
table2.dat 29 166 Out of transit data on 14/09/2010
table3.dat 29 368 Out of transit data on 21/09/2010
table4.dat 29 279 In transit data on 28/09/2010
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Byte-by-byte Description of file: table?.dat
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Bytes Format Units Label Explanations
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1- 14 F14.5 d HJD Heliocentric Julian Date
15- 22 F8.4 mag DRmag Differential magnitude on R-band
23- 29 F7.4 mag e_DRmag Differential magnitude error
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Acknowledgements:
Enrique Herrero, eherrero(at)ieec.uab.es
(End) Enrique Herrero (ICE-CSIC, Spain), Patricia Vannier [CDS] 17-Jan-2011