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High-precision photometry by telescope defocussing. VI. WASP-24, WASP-25 and WASP-26

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arxiv 1407.6253 v1 pith:6APBRXYS submitted 2014-07-23 astro-ph.EP astro-ph.SR

High-precision photometry by telescope defocussing. VI. WASP-24, WASP-25 and WASP-26

classification astro-ph.EP astro-ph.SR
keywords wasp-24wasp-26systemswasp-25eclipsingmeasurementsobservationsorbital
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We present time-series photometric observations of thirteen transits in the planetary systems WASP-24, WASP-25 and WASP-26. All three systems have orbital obliquity measurements, WASP-24 and WASP-26 have been observed with Spitzer, and WASP-25 was previously comparatively neglected. Our light curves were obtained using the telescope-defocussing method and have scatters of 0.5 to 1.2 mmag relative to their best-fitting geometric models. We used these data to measure the physical properties and orbital ephemerides of the systems to high precision, finding that our improved measurements are in good agreement with previous studies. High-resolution Lucky Imaging observations of all three targets show no evidence for faint stars close enough to contaminate our photometry. We confirm the eclipsing nature of the star closest to WASP-24 and present the detection of a detached eclipsing binary within 4.25 arcmin of WASP-26.

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