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High-precision photometry by telescope defocusing - I. The transiting planetary system WASP-5

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Southworth, J. (John), Hinse, T. C., Jorgensen, U. G., Dominik, M., Ricci, D., Burgdorf, M. J., Hornstrup, A., Wheatley, P. J., Anguita, T., Bozza, V. et al.
. (2009) High-precision photometry by telescope defocusing - I. The transiting planetary system WASP-5. Monthly Notices of the Royal Astronomical Society, Vol.396 (No.2). pp. 1023-1031. ISSN 0035-8711

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Abstract

We present high-precision photometry of two transit events of the extrasolar planetary system WASP-5, obtained with the Danish 1.54-m telescope at European Southern Obseratory La Silla. In order to minimize both random and flat-fielding errors, we defocused the telescope so its point spread function approximated an annulus of diameter 40 pixel (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 0.50 mmag for the first transit and 0.59 mmag for the second. We construct detailed signal-to-noise ratio calculations for defocused 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. We find that the planet has a mass of M-b = 1.637 +/- 0.075 +/- 0.033 M-Jup, a radius of R-b = 1.171 +/- 0.056 +/- 0.012 R-Jup, a large surface gravity of g(b) = 29.6 +/- 2.8 m s(-2) and a density of rho(b) = 1.02 +/- 0.14 +/- 0.01 rho(Jup) (statistical and systematic uncertainties). The planet's high equilibrium temperature of T-eq = 1732 +/- 80 K makes it a good candidate for detecting secondary eclipses.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Official Date: 21 June 2009
Volume: Vol.396
Number: No.2
Number of Pages: 9
Page Range: pp. 1023-1031
Identification Number: 10.1111/j.1365-2966.2009.14767.x
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: STFC, Northern Ireland Department of Culture, Arts and Leisure, Regione Campania
Grant number: 5/2002
Open Access Version:
URI: http://wrap.warwick.ac.uk/id/eprint/27784

Data sourced from Thomson Reuters' Web of Knowledge

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