Astrophys. J., 823, 29-29 (2016/May-3)
Spin-orbit alignment for three transiting hot jupiters: WASP-103b, WASP-87b, and WASP-66b.
ADDISON B.C., TINNEY C.G., WRIGHT D.J. and BAYLISS D.
Abstract (from CDS):
We have measured the sky-projected spin-orbit alignments for three transiting hot Jupiters, WASP-103b, WASP-87b, and WASP-66b, using spectroscopic measurements of the Rossiter-McLaughlin effect, with the CYCLOPS2 optical fiber bundle system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The resulting sky-projected spin-orbit angles of λ=3°±33°, λ=-8°±11°, and λ=-4°±22° for WASP-103b, WASP-87b, and WASP-66b, respectively, suggest that these three planets are likely on nearly aligned orbits with respect to their host star's spin axis. WASP-103 is a particularly interesting system as its orbital distance is only 20% larger than its host star's Roche radius and the planet likely experiences strong tidal effects. WASP-87 and WASP-66 are hot (Teff=6450±120 K and Teff=6600±150 K, respectively) mid-F stars, making them similar to the majority of stars hosting planets on high-obliquity orbits. Moderate spin-orbit misalignments for WASP-103b and WASP-66b are consistent with our data, but polar and retrograde orbits are not favored for these systems.
© 2016. The American Astronomical Society. All rights reserved.
planets and satellites: dynamical evolution and stability - stars: individual: (WASP-103, WASP-87, WASP-66) - techniques: radial velocities
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