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arXiv · 1802.00766

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

L. Y. Temple·C. Hellier·Y. Almleaky·D. R. Anderson·F. Bouchy·D. J. A. Brown·A. Burdanov·A. Collier Cameron·L. Delrez·M. Gillon·R. Hall·E. Jehin·M. Lendl·P. F. L. Maxted·L. D. Nielsen·F. Pepe·D. Pollacco·D. Queloz·D. Ségransan·B. Smalley·S. Sohy·S. Thompson·A. H. M. J. Triaud·O. D. Turner·S. Udry·R. G. West
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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$_{\rm Jup}$. The planet's mass has an upper limit of 1.3 M$_{\rm Jup}$. WASP-174 is the faintest hot-Jupiter system so far confirmed by tomographic means.

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L. Y. Temple, C. Hellier, Y. Almleaky, D. R. Anderson, F. Bouchy, D. J. A. Brown, A. Burdanov, A. Collier Cameron, L. Delrez, M. Gillon, R. Hall, E. Jehin, M. Lendl, P. F. L. Maxted, L. D. Nielsen, F. Pepe, D. Pollacco, D. Queloz, D. Ségransan, B. Smalley, S. Sohy, S. Thompson, A. H. M. J. Triaud, O. D. Turner, S. Udry, R. G. West. 2018-02-02. Discovery of WASP-174b: Doppler tomography of a near-grazing transit. https://doi.org/10.1093/mnras/sty2197

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