binaries: eclipsing; stars: individual: WASP-4; planetary systems
Abstract :
[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.
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
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 ; 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
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 ; Université de Liège - ULiège > 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
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