A much lower density for the transiting extrasolar planet WASP-7
- Southworth, J.
- Dominik, M.
- Jørgensen, U. G.
- Rahvar, S.
- Snodgrass, C.
- Alsubai, K.
- Bozza, V.
- Browne, P.
- Burgdorf, M.
- Calchi Novati, S.
- Dodds, P.
- Dreizler, S.
- Finet, F.
- Gerner, T.
- Hardis, S.
- Harpsøe, K.
- Hellier, C.
- Hinse, T. C.
- Hundertmark, M.
- Kains, N.
- Kerins, E.
- Liebig, C.
- Mancini, L.
- Mathiasen, M.
- Penny, M. T.
- Proft, S.
- Ricci, D.
- Sahu, K.
- Scarpetta, G.
- Schäfer, S.
- Schönebeck, F.
- Surdej, J.
DOIAbstract
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 0.915+0.046−0.040 RJup) and much lower density (0.41 ± 0.10 ρJup versus 1.26+0.25−0.21 ρJup) and surface gravity (13.4 ± 2.6ms−2 versus 26.4+4.4−4.0 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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