High-precision photometry by telescope defocussing. I. The transiting planetary system WASP-5

By J. Southworth, T. Hinse, U. G. Joêrgensen, M. Dominik, D. Ricci, M. Burgdorf, A. Hornstrup, P. Wheatley, T. Anguita, V. Bozza and 13 more. 2009

143 citations recorded by the source corpus.

We present high-precision photometry of three transits of the extrasolar planetary system WASP-2, obtained by defocussing the telescope, and achieving point-to-point scatters of between 0.42 and 0.73 mmag. These data are modelled using the JKTEBOP code, and taking into account the light from the recently-discovered faint star close to the system. The physical properties of the WASP-2 system are derived using tabulated predictions from five different sets of stellar evolutionary models, allowing both statistical and systematic errorbars to be specified. We find the mass and radius of the planet to be M_b = 0.847 +/- 0.038 +/- 0.024 Mjup and R_b = 1.044 +/- 0.029 +/- 0.015 Rjup. It has a low equilibrium temperature of 1280 +/- 21 K, in agreement with a recent finding that it does not have an atmospheric temperature inversion. The first of our transit datasets has a scatter of only 0.42 mmag with respect to the best-fitting light curve model, which to our knowledge is a record for ground-based observations of a transiting extrasolar planet.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/f8d2e3d0b4c8f0657344996c75d34fd4b3fb3993

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In Astronomy and Astrophysics

1. J. Southworth
2. D. Sing
3. David Kipping
4. Jingjing Chen
5. J. Winn
6. Roberto Sanchis-Ojeda
7. H. Wakeford

In Instrumentation

1. J. Southworth
2. D. Sing
3. David Kipping
4. Jingjing Chen
5. J. Winn
6. Roberto Sanchis-Ojeda

Citations in the corpus

• Homogeneous studies of transiting extrasolar planets - III. Additional planets and stellar models (2010, methodology): “In many cases I adopt theJKTEBOPresults from Paper I or later works (Southworth et al. 2009a,b,c, 2010).”
• Homogeneous studies of transiting extrasolar planets – IV. Thirty systems with space-based light curves (2011, methodology): “I account for this by adding published constraints on orbital eccentricity (e) and periastron longitude (ω), with the parameter combinationse cosω ande sinω when possible, using the approach outlined in Paper III and Southworth et al. (2009c).”