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

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

2009-03-12

arxiv.org/abs/0903.2139v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

Accepted for publication in MNRAS. 9 pages, 4 figures, quite a few tables

Scientific paper

We present high-precision photometry of two transit events of the extrasolar planetary system WASP-5, obtained with the Danish 1.54m telescope at ESO La Silla. In order to minimise both random and flat-fielding errors, we defocussed the telescope so its point spread function approximated an annulus of diameter 40 pixels (16 arcsec). Data reduction was undertaken using standard aperture photometry plus an algorithm for optimally combining the ensemble of comparison stars. The resulting light curves have point-to-point scatters of 0.50 mmag for the first transit and 0.59 mmag for the second. We construct detailed signal to noise calculations for defocussed photometry, and apply them to our observations. We model the light curves with the JKTEBOP code and combine the results with tabulated predictions from theoretical stellar evolutionary models to derive the physical properties of the WASP-5 system. We find that the planet has a mass of M_b = 1.637 +/- 0.075 +/- 0.033 Mjup, a radius of R_b = 1.171 +/- 0.056 +/- 0.012 Rjup, a large surface gravity of g_b = 29.6 +/- 2.8 m/s2 and a density of rho_b = 1.02 +/- 0.14 +/- 0.01 rhojup (statistical and systematic uncertainties). The planet's high equilibrium temperature of T_eq = 1732 +/- 80 K makes it a good candidate for detecting secondary eclipses.

Affiliated with

Also associated with

No associations

Rating

High-precision photometry by telescope defocussing. I. The transiting planetary system WASP-5 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High-precision photometry by telescope defocussing. I. The transiting planetary system WASP-5, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-precision photometry by telescope defocussing. I. The transiting planetary system WASP-5 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-36256