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arxiv 1903.02800 v1 pith:R7SLLTFO submitted 2019-03-07 astro-ph.EP

Physical properties and transmission spectrum of the WASP-74 planetary system from multi-band photometry

classification astro-ph.EP
keywords opticalplanetarysystemdatahostinfraredjupiternear
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present broad-band photometry of eleven planetary transits of the hot Jupiter WASP-74b, using three medium-class telescopes and employing the telescope-defocussing technique. Most of the transits were monitored through I filters and one was simultaneously observed in five optical (U, g', r', i', z') and three near infrared (J, H, K) passbands, for a total of 18 light curves. We also obtained new high-resolution spectra of the host star. We used these new data to review the orbital and physical properties of the WASP-74 planetary system. We were able to better constrain the main system characteristics, measuring smaller radius and mass for both the hot Jupiter and its host star than previously reported in the literature. Joining our optical data with those taken with the HST in the near infrared, we built up an observational transmission spectrum of the planet, which suggests the presence of strong optical absorbers, as TiO and VO gases, in its atmosphere.

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