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

L. Y. Temple, C. Hellier, Y. Almleaky, 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. SohyS. Thompson, A. H. M. J. Triaud, O. D. Turner, S. Udry, R.G. West

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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 ± 0.09. The planet is
in a moderately misaligned orbit with a sky-projected spin–orbit angle of λ = 31 ± 1. 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 RJup.
The planet’s mass has an upper limit of 1.3 MJup. WASP-174 is the faintest hot-Jupiter system
so far confirmed by tomographic means.
Original languageEnglish
Pages (from-to)5307–5313
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date13 Aug 2018
Publication statusPublished - 11 Nov 2018

Bibliographical note

8 pages, 6 figures, accepted by MNRAS


  • astro-ph.EP
  • techniques: photometric
  • techniques: spectroscopic
  • planetary systems
  • stars: rotation


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