Reference : A much lower density for the transiting extrasolar planet WASP-7 (Research Note)
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/86416
A much lower density for the transiting extrasolar planet WASP-7 (Research Note)
English
Southworth, J. [> > > >]
Dominik, M. [> > > >]
Jorgensen, U~G [> > > >]
Rahvar, S. [> > > >]
Snodgrass, C. [> > > >]
Alsubai, K. [> > > >]
Bozza, V. [> > > >]
Browne, P. [> > > >]
Burgdorf, M. [> > > >]
Calchi Novati, S. [> > > >]
Dodds, P. [> > > >]
Dreizler, S. [> > > >]
Finet, François mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Gerner, T. [> > > >]
Hardis, S. [> > > >]
Harpsoe, K. [> > > >]
Hellier, C. [> > > >]
Hinse, T~C [> > > >]
Hundertmark, M. [> > > >]
Kains, N. [> > > >]
Kerins, E. [> > > >]
Liebig, C. [> > > >]
Mancini, L. [> > > >]
Mathiasen, M. [> > > >]
Penny, M~T [> > > >]
Proft, S. [> > > >]
Ricci, Davide mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Sahu, K. [> > > >]
Scarpetta, G. [> > > >]
Schafer, S. [> > > >]
Schonebeck, F. [> > > >]
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
2011
Astronomy and Astrophysics
EDP Sciences
527
A8.1-A8.5
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] Astrophysics ; Earth and Planetary Astrophysics
[en] 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 rhojup versus 1.26 +0.25 -0.21 rhojup) and surface gravity (13.4 +/- 2.6 m/s2 versus 26.4 +4.4 -4.0 m/s2) 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.
Researchers ; Professionals
http://hdl.handle.net/2268/86416
http://arxiv.org/abs/1012.5181
The authors thank The SAO/NASA Astrophysics Data System for their preprint deposit authorization.

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