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 RJup versus RJup) and much lower density (0.41 ± 0.10   ρJup versus   ρJup) 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.

A much lower density for the transiting extrasolar planet WASP-7

BOZZA, Valerio;SCARPETTA, Gaetano;
2011

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 RJup versus RJup) and much lower density (0.41 ± 0.10   ρJup versus   ρJup) 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/3081079
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