The highly inflated giant planet WASP-174b
L. Mancini, P. Sarkis, Th. Henning, G. A. Bakos, D. Bayliss, J. Bento,, W. Bhatti, R. Brahm, Z. Csubry, N. Espinoza, J. Hartman, A. Jordan, K. Penev,, M. Rabus, V. Suc, M. de Val-Borro, G. Zhou, G. Chen, M. Damasso, J., Southworth, T. G. Tan

TL;DR
This study refines the physical and orbital parameters of the highly-inflated hot giant exoplanet WASP-174b, confirming its grazing transits and extremely low density through combined photometric and radial velocity data analysis.
Contribution
It provides the first precise mass and radius measurements of WASP-174b, confirming its grazing transits and extremely low density, using combined multi-band photometry and radial velocity data.
Findings
WASP-174b has a mass of 0.330 Mj and a radius of 1.435 Rj.
The planet exhibits a very low density of 0.135 g/cm^3.
Transit observations confirm a grazing geometry with >5 sigma confidence.
Abstract
The transiting exoplanetary system WASP-174 was reported to be composed by a main-sequence F star (V=11.8 mag) and a giant planet, WASP-174b (orbital period 4.23 days). However only an upper limit was placed on the planet mass (<1.3 Mj), and a highly uncertain planetary radius (0.7-1.7 Rj) was determined. We aim to better characterise both the star and the planet and precisely measure their orbital and physical parameters. In order to constrain the mass of the planet, we obtained new measurements of the radial velocity of the star and joined them with those from the discovery paper. Photometric data from the HATSouth survey and new multi-band, high-quality (precision reached up to 0.37~mmag) photometric follow-up observations of transit events were acquired and analysed for getting accurate photometric parameters. We fit the model to all the observations, including data from the TESS…
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