Discovery of WASP-174b: Doppler tomography of a near-grazing transit

Abstract

We report the discovery and tomographic detection of WASP-174b, a planet with a near-grazing transit on a 4.23-d orbit around a $V$ = 11.9, F6V star with [Fe/H] = 0.09 $\pm$ 0.09. The planet is in a moderately misaligned orbit with a sky-projected spin-orbit angle of $\lambda$ = 31${}^{\circ }$ $\pm$ 1${}^{\circ }$. This is in agreement with the known tendency for orbits around hotter stars to be misaligned. Owing to the grazing transit the planet's radius is uncertain, with a possible range of 0.8-1.8 R${}_{\mathrm{Jup}}$. The planet's mass has an upper limit of 1.3 M${}_{\mathrm{Jup}}$. WASP-174 is the faintest hot-Jupiter system so far confirmed by tomographic means.

arXiv comment8 pages, 6 figures, accepted by MNRAS

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