J/MNRAS/396/1023 Transiting planetary system WASP-5 (Southworth+, 2009)
High-precision photometry by telescope defocusing.
I. The transiting planetary system WASP-5.
Southworth J., Hinse T.C., Jorgensen U.G., Dominik M., Ricci D.,
Burgdorf M.J., Hornstrup A., Wheatley P.J., Anguita T., Bozza V.,
Novati S.C., Harpsoe K., Kjaergaard P., Liebig C., Mancini L., Masi G.,
Mathiasen M., Rahvar S., Scarpetta G., Snodgrass C., Surdej J., Thone C.C.,
Zub M.
<Mon. Not. R. Astron. Soc., 396, 1023-1031 (2009)>
=2009MNRAS.396.1023S 2009MNRAS.396.1023S
ADC_Keywords: Planets ; Photometry
Keywords: stars: planetary systems - methods: data analysis -
methods: observational - techniques: photometric
Abstract:
We present high-precision photometry of two transit events of the
extrasolar planetary system WASP-5, obtained with the Danish 1.54m
telescope at ESO La Silla. In order to minimise both random and
flat-fielding errors, we defocussed the telescope so its point spread
function approximated an annulus of diameter 40 pixels (16 arcsec).
Data reduction was undertaken using standard aperture photometry plus
an algorithm for optimally combining the ensemble of comparison stars.
The resulting light curves have point-to- point scatters of 0.50mmag
for the first transit and 0.59mmag for the second. We construct
detailed signal to noise calculations for defocussed photometry, and
apply them to our observations. We model the light curves with the
JKTEBOP code and combine the results with tabulated predictions from
theoretical stellar evolutionary models to derive the physical
properties of the WASP-5 system.
Description:
Light curves of two transit events of the transiting extrasolar
planetary system WASP-5 are presented. The data were obtained using
the Danish 1.5m telescope and DFOSC camera at ESO La Silla in 2008,
with substantial telescope defocussing in order to improve the
photometric precision of the observations. A Cousins R filter and
exposure times of 120s were used.
Objects:
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RA (2000) DE Designation(s)
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23 57 23.8 -41 16 38 WASP-5 = GSC 08018-00199
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
wasp5.dat 37 174 Defocussed photometry of WASP-5 (table2)
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See also:
J/AJ/137/3826 : Two transits of the giant planet WASP-4b (Winn+, 2009)
J/A+A/501/785 : Discovery and characterization of WASP-6b (Gillon+, 2009)
J/A+A/502/391 : WASP-13b photometry and radial velocities (Skillen+, 2009)
Byte-by-byte Description of file: wasp5.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d HJD HJD for the midpoint of observation
17- 26 F10.7 mag Rmag Differential R-band magnitude of WASP-5
29- 37 F9.7 mag e_Rmag Measurement error of the R-band magnitude
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Acknowledgements:
John Southworth, jkt(at)astro.keele.ac.uk
(End) John Southworth [Keele Univ., UK], Patricia Vannier [CDS] 09-Oct-2009