Published in
Hans Publishers, Astronomy & Astrophysics, (527), p. A8
DOI: 10.1051/0004-6361/201016183
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A much lower density for the transiting extrasolar planet WASP-7
,
U~G G. Jorgensen,
S. Rahvar,
C. Snodgrass ,
K. Alsubai,
V. Bozza,
P. Browne,
M. Burgdorf,
S. Calchi Novati,
S. Calchi Novati,
P. Dodds,
S. Dreizler,
François Finet,
T. Gerner
and other authors.
Full text: Download
Abstract
We present the first high-precision photometry of the transiting extrasolar planetary system WASP-7, obtained using telescope defocussing techniques and reaching a scatter of 0.68 mmag per point. We find that the transit depth is greater and that the host star is more evolved than previously thought. The planet has a significantly larger radius (1.330 ± 0.093 R Jup versus ; R Jup ) and much lower density (0.41 ± 0.10 ρ Jup versus ; ρ Jup ) and surface gravity (13.4 ± 2.6 m s -2 versus ; m s -2 ) than previous measurements showed. Based on the revised properties it is no longer an outlier in planetary mass-radius and period-gravity diagrams. We also obtain a more precise transit ephemeris for the WASP-7 system. Based on data collected by MiNDSTEp with the Danish 1.54 m telescope at the ESO La Silla Observatory.Lightcurves data is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/527/A8 ; DOI: 10.1051/0004-6361/201016183; eprintid: arXiv:1012.5181