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

Southworth, J ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1051/0004-6361/201016183
  3. Abstract:
  4. 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
  5. Keywords:
  6. Planetary systems ; Planets and satellites: fundamental parameters ; Stars: individual: WASP-7 ; Extra solar planets ; Extrasolar ; High-precision ; Host-stars ; Lower density ; Planetary mass ; Planetary system ; Planets and satellites ; Surface gravity ; Gravitation ; Planets ; Stars ; Satellites
  7. Source: Astronomy and Astrophysics ; Volume 527, Issue 1 , 2011 ; 00046361 (ISSN)
  8. URL: http://www.astro.keele.ac.uk/jkt/pubs/Southworth-WASP7.pdf