Article (Scientific journals)
High-precision photometry by telescope defocusing - I. The transiting planetary system WASP-5
Southworth, John; Hinse, T. C.; Jørgensen, U. G. et al.
2009In Monthly Notices of the Royal Astronomical Society, 396, p. 1023-1031
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Keywords :
methods: data analysis; methods: observational; techniques: photometric; binaries: eclipsing; stars: individual: WASP-5; planetary systems
Abstract :
[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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
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 ;  Université de Liège - ULiège > 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  ;  Université de Liège - ULiège > 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
More authors (13 more) Less
Language :
English
Title :
High-precision photometry by telescope defocusing - I. The transiting planetary system WASP-5
Publication date :
01 June 2009
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Volume :
396
Pages :
1023-1031
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
DR and JS acknowledge support from the Communauté française de Belgique - Actions de recherche concertées - Académie universitaire Wallonie-Europe
Commentary :
http://de.arxiv.org/abs/0903.2139
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