Статья

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

J. SouthworthDepartment of Physics, University of Warwick, Coventry CV4 7ALT. C. HinseNiels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen Ø 2100, DenmarkU. G. JørgensenNiels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen 2100, DenmarkM. DominikSUPA, University of St Andrews, School of Physics and Astronomy, North Haugh, St Andrews KY16 9SSD. RicciInstitut d'Astrophysique et de Géophysique, Université de Liège, 4000 Liège, BelgiumM. BurgdorfAstrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LDA. HornstrupNational Space Institute, Technical University of Denmark, Juliane Maries Vej 30, Copenhagen 2100, DenmarkP. J. WheatleyDepartment of Physics, University of Warwick, Coventry CV4 7ALT. AnguitaAstronomisches Rechen-Institut, Zentrum fr Astronomie, Universitt Heidelberg, Mnchhofstrasse 12-14, 69120 Heidelberg, GermanyV. BozzaDipartimento di Fisica 'E. R. Caianiello', Universit di Salerno, Baronissi, ItalyS. Calchi NovatiDipartimento di Fisica 'E. R. Caianiello', Universit di Salerno, Baronissi, ItalyK. HarpsøeNiels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen 2100, DenmarkP. KjærgaardNiels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen 2100, DenmarkC. LiebigAstronomisches Rechen-Institut, Zentrum fr Astronomie, Universitt Heidelberg, Mnchhofstrasse 12-14, 69120 Heidelberg, GermanyL. ManciniDipartimento di Fisica 'E. R. Caianiello', Universit di Salerno, Baronissi, ItalyG. MasiBellatrix Observatory, Centre for Backyard Astrophysics, Ceccano (FR), ItalyM. MathiasenNiels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen 2100, DenmarkS. RahvarSharif University of Technology, Tehran, IranG. ScarpettaDipartimento di Fisica 'E. R. Caianiello', Universit di Salerno, Baronissi, ItalyC. SnodgrassEuropean Southern Observatory, Casilla 19001, Santiago 19, ChileJ. SurdejInstitut d'Astrophysique et de Gophysique, Universit de Lige, 4000 Lige, BelgiumC. C. ThöneINAF, Osservatorio Astronomico di Brera, 23807 Merate, ItalyM. ZubAstronomisches Rechen-Institut, Zentrum fr Astronomie, Universitt Heidelberg, Mnchhofstrasse 12-14, 69120 Heidelberg, Germany

2009en

ABI

Аннотация

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 signalto-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 b = 1.02 0.14 0.01 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.

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Идентификаторы

DOI: 10.1111/j.1365-2966.2009.14767.x

Цитирования и источники

Цитирований: 2Использованных источников: 0

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