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

(Research Note)

J. Southworth, M. Dominik, U. G. Jørgensen, S. Rahvar, C. Snodgrass, Khalid Al-Subai, 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 & 12 others E. Kerins, C. Liebig, L. Mancini, M. Mathiasen, M. T. Penny, S. Proft, D. Ricci, K. Sahu, G. Scarpetta, S. Schäfer, F. Schönebeck, J. Surdej

Research output: Contribution to journalArticle

13 Citations (Scopus)

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 0.915+0.046 -0.040 RJup) and much lower density (0.41 ± 0.10 pJup versus 1.26+0.25 -0.21 pJup) and surface gravity (13.4 ± 2.6ms-2 versus 26.4+4.4 -4.0 ms-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.

Original languageEnglish
Article numberA8
JournalAstronomy and Astrophysics
Volume527
Issue number1
DOIs
Publication statusPublished - 1 Mar 2011

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extrasolar planets
transit
planet
gravity
gravitation
planetary mass
radii
planetary systems
outlier
photometry
planets
diagram
diagrams
telescopes
stars

Keywords

  • planetary systems
  • planets and satellites: fundamental parameters
  • stars: individual: WASP-7

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Southworth, J., Dominik, M., Jørgensen, U. G., Rahvar, S., Snodgrass, C., Al-Subai, K., ... Surdej, J. (2011). A much lower density for the transiting extrasolar planet WASP-7: (Research Note). Astronomy and Astrophysics, 527(1), [A8]. https://doi.org/10.1051/0004-6361/201016183

A much lower density for the transiting extrasolar planet WASP-7 : (Research Note). / Southworth, J.; Dominik, M.; Jørgensen, U. G.; Rahvar, S.; Snodgrass, C.; Al-Subai, Khalid; Bozza, V.; Browne, P.; Burgdorf, M.; Novati, S. Calchi; 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.

In: Astronomy and Astrophysics, Vol. 527, No. 1, A8, 01.03.2011.

Research output: Contribution to journalArticle

Southworth, J, Dominik, M, Jørgensen, UG, Rahvar, S, Snodgrass, C, Al-Subai, K, Bozza, V, Browne, P, Burgdorf, M, Novati, SC, Dodds, P, Dreizler, S, Finet, F, Gerner, T, Hardis, S, Harpsøe, K, Hellier, C, Hinse, TC, Hundertmark, M, Kains, N, Kerins, E, Liebig, C, Mancini, L, Mathiasen, M, Penny, MT, Proft, S, Ricci, D, Sahu, K, Scarpetta, G, Schäfer, S, Schönebeck, F & Surdej, J 2011, 'A much lower density for the transiting extrasolar planet WASP-7: (Research Note)', Astronomy and Astrophysics, vol. 527, no. 1, A8. https://doi.org/10.1051/0004-6361/201016183
Southworth, J. ; Dominik, M. ; Jørgensen, U. G. ; Rahvar, S. ; Snodgrass, C. ; Al-Subai, Khalid ; Bozza, V. ; Browne, P. ; Burgdorf, M. ; Novati, S. Calchi ; 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. / A much lower density for the transiting extrasolar planet WASP-7 : (Research Note). In: Astronomy and Astrophysics. 2011 ; Vol. 527, No. 1.
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AU - Rahvar, S.

AU - Snodgrass, C.

AU - Al-Subai, Khalid

AU - Bozza, V.

AU - Browne, P.

AU - Burgdorf, M.

AU - Novati, S. Calchi

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AU - Kains, N.

AU - Kerins, E.

AU - Liebig, C.

AU - Mancini, L.

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AU - Penny, M. T.

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AU - Ricci, D.

AU - Sahu, K.

AU - Scarpetta, G.

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