Reference : High-precision photometry by telescope defocusing - I. The transiting planetary system W...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/21860
High-precision photometry by telescope defocusing - I. The transiting planetary system WASP-5
English
Southworth, John [Department of Physics, University of Warwick, Coventry CV4 7AL]
Hinse, T. C. [Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen Ø 2100, Denmark; Armagh Observatory, College Hill, Armagh BT61 9DG]
Jørgensen, U. G. [Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen Ø 2100, Denmark]
Dominik, M. [SUPA, University of St Andrews, School of Physics and Astronomy, North Haugh, St Andrews KY16 9SS]
Ricci, Davide mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Burgdorf, M. J. [Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD]
Hornstrup, A. [National Space Institute, Technical University of Denmark, Juliane Maries Vej 30, Copenhagen Ø 2100, Denmark]
Wheatley, P. J. [Department of Physics, University of Warwick, Coventry CV4 7AL]
Anguita, T. [Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstrasse 12-14, 69120 Heidelberg, Germany]
Bozza, V. [Dipartimento di Fisica `E. R. Caianiello', Università di Salerno, Baronissi, Italy; Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Italy]
Novati, S Calchi [Dipartimento di Fisica `E. R. Caianiello', Università di Salerno, Baronissi, Italy; Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Italy]
Harpsøe, K. [Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen Ø 2100, Denmark]
Kjærgaard, P. [Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen Ø 2100, Denmark]
Liebig, C. [Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstrasse 12-14, 69120 Heidelberg, Germany]
Mancini, L. [Dipartimento di Fisica `E. R. Caianiello', Università di Salerno, Baronissi, Italy; Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Italy]
Masi, G. [Bellatrix Observatory, Centre for Backyard Astrophysics, Ceccano (FR), Italy]
Mathiasen, M. [Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen Ø 2100, Denmark]
Rahvar, S. [Sharif University of Technology, Tehran, Iran]
Scarpetta, G. [Dipartimento di Fisica `E. R. Caianiello', Università di Salerno, Baronissi, Italy; Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Italy]
Snodgrass, C. [European Southern Observatory, Casilla 19001, Santiago 19, Chile]
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Thöne, C. C. [Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen Ø 2100, Denmark; INAF, Osservatorio Astronomico di Brera, 23807 Merate, Italy]
Zub, M. [Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstrasse 12-14, 69120 Heidelberg, Germany]
1-Jun-2009
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
396
1023-1031
Yes (verified by ORBi)
International
0035-8711
Oxford
United Kingdom
[en] methods: data analysis ; methods: observational ; techniques: photometric ; binaries: eclipsing ; stars: individual: WASP-5 ; planetary systems
[en] 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 0.50mmag for the first transit and 0.59mmag 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[SUB]b[/SUB] = 1.637 +/- 0.075 +/- 0.033M[SUB]Jup[/SUB], a radius of R[SUB]b[/SUB] = 1.171 +/- 0.056 +/- 0.012R [SUB]Jup[/SUB], a large surface gravity of g[SUB]b[/SUB] = 29.6 +/- 2.8ms[SUP]-2[/SUP] and a density of rho[SUB]b[/SUB] = 1.02 +/- 0.14 +/- 0.01rho[SUB]Jup[/SUB] (statistical and systematic uncertainties). The planet's high equilibrium temperature of T[SUB]eq[/SUB] = 1732 +/- 80K makes it a good candidate for detecting secondary eclipses. Based on data collected by Microlensing Network for the Detection of Small Terrestrial Exoplanets (MiNDSTEp) with the Danish 1.54-m telescope at the ESO La Silla Observatory. E-mail: j.k.taylor@warwick.ac.uk â ¡ Royal Society University Research Fellow.
DR and JS acknowledge support from the Communauté française de Belgique - Actions de recherche concertées - Académie universitaire Wallonie-Europe
Researchers ; Professionals
http://hdl.handle.net/2268/21860
10.1111/j.1365-2966.2009.14767.x
http://esoads.eso.org/abs/2009MNRAS.396.1023S
The authors thank arXiv.org for their deposit authorization and Blackwell Publishing for publication
http://de.arxiv.org/abs/0903.2139

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