标题：Stellar Obliquities and Planetary Alignments (SOPA). I. Spin–Orbit Measurements of Three Transiting Hot Jupiters: WASP-72b, WASP-100b, and WASP-109b
摘要：We report measurements of the sky-projected spin–orbit angles for three transiting hot Jupiters, two of which are in nearly polar orbits, WASP-100b and WASP-109b, and a third in a low-obliquity orbit, WASP-72b. We obtained these measurements by observing the Rossiter–McLaughlin effect over the course of the transits from high-resolution spectroscopic observations made with the CYCLOPS2 optical fiber bundle system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The resulting sky-projected spin–orbit angles are 7 12 11 l = - - +, 79 10 19 l = - + , and 99 9 10 l = - + for WASP-72b, WASP-100b, and WASP-109b, respectively. These results suggests that WASP-100b and WASP-109b are on highly inclined orbits tilted nearly 90 ◦ from their host star’s equator, while the orbit of WASP-72b appears to be well-aligned. WASP-72b is a typical hot Jupiter orbiting a mid-late F star (F7 with T eff = 6250 ±120 K). WASP-100b and WASP-109b are highly irradiated bloated hot Jupiters orbiting hot early-mid F stars (F2 with T eff = 6900± 120 K and F4 with T eff = 6520± 140 K), making them consistent with the trends observed for the majority of stars hosting planets on high-obliquity orbits.
关键词：planets and satellites: dynamical evolution and stability;stars: individual (WASP-72, WASP-100, WASP-109);techniques: radial velocities
