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

Mancini, L.; Southworth, J.; Mollière, P.; Tregloan-Reed, J.; Juvan, I. G.; Chen, G.; Sarkis, P.; Bruni, I.; Ciceri, S.; Andersen, M. I.; Bozza, V.; Bramich, D. M.; Burgdorf, M.; D’Ago, G.; Dominik, M.; Evans, D. F.; Figuera Jaimes, R.; Fossati, L.; Henning, Th.; Hinse, T. C.; Hundertmark, M.; Jørgensen, U. G.; Kerins, E.; Korhonen, H.; Küffmeier, M.; Longa, P.; Peixinho, N.; Popovas, A.; Rabus, M.; Rahvar, S.; Skottfelt, J.; Snodgrass, C.; Tronsgaard, R.; Wang, Y. and Wertz, O. (2019). Physical properties and transmission spectrum of the WASP-74 planetary system from multi-band photometry. Monthly Notices of the Royal Astronomical Society, 485(4) pp. 5168–5179.

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We present broad-band photometry of eleven planetary transits of the hot Jupiter WASP-74 b, 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.

Item Type: Journal Item
Copyright Holders: 2019 The Authors
ISSN: 1365-2966
Keywords: stars: planetary systems; stars: fundamental parameters; stars: individual: WASP-74; techniques: photometric
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 60037
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 26 Mar 2019 09:23
Last Modified: 28 Jan 2020 05:06
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