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

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...

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Main Authors: Southworth, John (Author) , Dominik, M. (Author) , Jørgensen, U. G. (Author) , Rahvar, S. (Author) , Snodgrass, C. (Author) , Alsubai, K. (Author) , Bozza, V. (Author) , Browne, P. (Author) , Burgdorf, M. (Author) , Novati, S. Calchi (Author) , Dodds, P. (Author) , Dreizler, S. (Author) , Finet, F. (Author) , Gerner, T. (Author) , Hardis, S. (Author) , Harpsøe, K. (Author) , Hellier, C. (Author) , Hinse, T. C. (Author) , Hundertmark, M. (Author) , Kains, N. (Author) , Kerins, E. (Author) , Liebig, C. (Author) , Mancini, L. (Author) , Mathiasen, M. (Author) , Penny, M. T. (Author) , Proft, Svea (Author) , Ricci, D. (Author) , Sahu, K. (Author) , Scarpetta, G. (Author) , Schäfer, S. (Author) , Schönebeck, Frederik (Author) , Surdej, J. (Author)
Format: Article (Journal)
Language:English
Published: 18 January 2011
In: Astronomy and astrophysics
Year: 2011, Volume: 527, Pages: 1-5
ISSN:1432-0746
DOI:10.1051/0004-6361/201016183
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/201016183
Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2011/03/aa16183-10/aa16183-10.html
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Author Notes:J. Southworth, M. Dominik, U.G. Jørgensen, S. Rahvar, C. Snodgrass, K. Alsubai, V. Bozza, P. Browne, M. Burgdorf, S. Calchi Novati, P. Dodds, S. Dreizler, F. Finet, T. Gerner, S. Hardis, K. Harpsøe, C. Hellier, T.C. Hinse, M. Hundertmark, N. Kains, E. Kerins, C. Liebig, L. Mancini, M. Mathiasen, M.T. Penny, S. Proft, D. Ricci, K. Sahu, G. Scarpetta, S. Schäfer, F. Schönebeck, and J. Surdej
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Summary: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 $\er{0.915}{0.046}{0.040}$ 0.91 5 -0.040 + 0.046 RJup) and much lower density (0.41 ± 0.10 ρJup versus $\er{1.26}{0.25}{0.21}$ 1.2 6 -0.21 + 0.25 ρJup) and surface gravity (13.4 ± 2.6 m s-2 versus $\er{26.4}{4.4}{4.0}$ 26. 4 -4.0 + 4.4 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.
Item Description:Gesehen am 19.10.2022
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/201016183

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