TY - JOUR
T1 - A much lower density for the transiting extrasolar planet WASP-7
AU - Southworth...[et al.], J.
AU - Dominik, M.
AU - Jørgensen, Uffe Gråe
AU - Harpsøe, Kennet Bomann West
AU - Hinse, T.C.
AU - Mathiasen, M.
PY - 2011/3/1
Y1 - 2011/3/1
N2 - 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.
AB - 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.
U2 - 10.1051/0004-6361/201016183
DO - 10.1051/0004-6361/201016183
M3 - Journal article
SN - 0004-6361
VL - 527
SP - A8
JO - Astronomy and Astrophysics Supplement Series
JF - Astronomy and Astrophysics Supplement Series
ER -