Reference : High-precision photometry by telescope defocussing - II. The transiting planetary system...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/21859
High-precision photometry by telescope defocussing - II. The transiting planetary system WASP-4
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]
Burgdorf, M. J. [Deutsches SOFIA Institut, Universitaet Stuttgart, Pfaffenwaldring 31, 70569 Stuttgart, Germany]
Dominik, M. [SUPA, University of St Andrews, School of Physics & Astronomy, North Haugh, St Andrews KY16 9SS]
Hornstrup, A. [National Space Institute, Technical University of Denmark, Juliane Maries Vej 30, Copenhagen Ø, 2100 Denmark]
Jørgensen, U. G. [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]
Ricci, Davide 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]
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; Instituto Nazionale di Fisica Nucleare, Sezione di Napoli, Italy]
Novati, S Calchi [Dipartimento di Fisica ``E. R. Caianiello'', Università di Salerno, Baronissi, Italy; Instituto Nazionale di Fisica Nucleare, Sezione di Napoli, Italy]
Harpsøe, K. [Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen Ø, 2100 Denmark]
Mancini, L. [Dipartimento di Fisica ``E. R. Caianiello'', Università di Salerno, Baronissi, Italy; Instituto 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. [Department of Physics, Sharif University of Technology, Tehran, Iran]
Scarpetta, G. [Dipartimento di Fisica ``E. R. Caianiello'', Università di Salerno, Baronissi, Italy; Instituto 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) >]
Zub, M. [Astronomisches Rechen-Institut, Zentrum für Astronomie, Universität Heidelberg, Mönchhofstrasse 12-14, 69120 Heidelberg, Germany]
1-Aug-2009
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
1224
Yes (verified by ORBi)
International
0035-8711
Oxford
United Kingdom
[en] binaries: eclipsing ; stars: individual: WASP-4 ; planetary systems
[en] We present and analyse light curves of four transits of the Southern hemisphere extrasolar planetary system WASP-4, obtained with a telescope defocused so the radius of each point spread function was 17 arcsec (44 pixels). This approach minimizes both random and systematic errors, allowing us to achieve scatters of between 0.60 and 0.88 mmag per observation over complete transit events. The light curves are augmented by published observations and analysed using the JKTEBOP code. The results of this process are combined with theoretical stellar model predictions to derive the physical properties of the WASP-4 system. We find that the mass and radius of the planet are M[SUB]b[/SUB] = 1.289[SUP]+0.090[/SUP][SUB]-0.090[/SUB][SUP]+0.039[/SUP][SUB]-0.000[/SUB]M[SUB]Jup[/SUB] and R[SUB]b[/SUB] = 1.371[SUP]+0.032[/SUP][SUB]-0.035[/SUB][SUP]+0.021[/SUP][SUB]-0.000[/SUB]R[SUB]Jup[/SUB], respectively (statistical and systematic uncertainties). These quantities give a surface gravity and density of g[SUB]b[/SUB] = 17.03[SUP]+0.97[/SUP][SUB]-0.54[/SUB]ms[SUP]-2[/SUP] and rho[SUB]b[/SUB] = 0.500[SUP]+0.032[/SUP][SUB]-0.021[/SUB][SUP]+0.000[/SUP][SUB]-0.008[/SUB] rho[SUB]Jup[/SUB], and fit the trends for short-period extrasolar planets to have relatively high masses and surface gravities. WASP-4 is now one of the best-quantified transiting extrasolar planetary systems, and significant further progress requires improvements to our understanding of the physical properties of low-mass stars. Based on data collected by MiNDSTEp with the Danish 1.54m telescope at the ESO La Silla Observatory. E-mail: jkt@astro.keele.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/2268/21859
10.1111/j.1365-2966.2009.15283.x
http://esoads.eso.org/abs/2009MNRAS.tmp.1224S
The authors thank arXiv.org for their deposit authorization and Blackwell Publishing for publication
http://de.arxiv.org/abs/0907.3356

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
Southworth_MNRAS_2009_xxx_xxxx_xxxx.pdfPublisher postprint1.03 MBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.