A much lower density for the transiting extrasolar planet WASP-7 (Research Note)

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; 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; Sahu, K.; Scarpetta, G.; Schafer, S.; Schonebeck, F.; Surdej, Jean

doi:10.1051/0004-6361/201016183

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Article (Scientific journals)

A much lower density for the transiting extrasolar planet WASP-7 (Research Note)

Southworth, J.; Dominik, M.; Jorgensen, U~G et al.

2011 • In Astronomy and Astrophysics, 527, p. 8.1-A8.5

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https://hdl.handle.net/2268/86416

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10.1051/0004-6361/201016183

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Keywords :

Astrophysics; Earth and Planetary Astrophysics

Abstract :

[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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Southworth, J.

Dominik, M.

Jorgensen, U~G

Rahvar, S.

Snodgrass, C.

Alsubai, K.

Bozza, V.

Browne, P.

Burgdorf, M.

Calchi Novati, S.

More authors (22 more)

Language :

English

Title :

A much lower density for the transiting extrasolar planet WASP-7 (Research Note)

Publication date :

2011

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

527

Pages :

A8.1-A8.5

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://arxiv.org/abs/1012.5181

Available on ORBi :

since 01 March 2011

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