Mon. Not. R. Astron. Soc., 460, 3376-3383 (2016/August-2)
Spin-orbit alignment for KELT-7b and HAT-P-56b via Doppler tomography with TRES.
ZHOU G., LATHAM D.W., BIERYLA A., BEATTY T.G., BUCHHAVE L.A., ESQUERDO G.A., BERLIND P. and CALKINS M.L.
Abstract (from CDS):
We present Doppler tomographic analyses for the spectroscopic transits of KELT-7b and HAT-P-56b, two hot-Jupiters orbiting rapidly rotating F-dwarf host stars. These include analyses of archival Tillinghast Reflector Echelle Spectrograph (TRES) observations for KELT-7b, and a new TRES transit observation of HAT-P-56b. We report spin-orbit aligned geometries for KELT-7b (2.○7±0_.^○6) and HAT-P-56b (8deg±2deg). The host stars KELT-7 and HAT-P-56 are among some of the most rapidly rotating planet-hosting stars known. We examine the tidal re-alignment model for the evolution of the spin-orbit angle in the context of the spin rates of these stars. We find no evidence that the rotation rates of KELT-7 and HAT-P-56 have been modified by star-planet tidal interactions, suggesting that the spin-orbit angle of systems around these hot stars may represent their primordial configuration. In fact, KELT-7 and HAT-P-56 are two of three systems in supersynchronous, spin-orbit aligned states, where the rotation periods of the host stars are faster than the orbital periods of the planets.
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
planets and satellites: individual: (KELT-7b, HAT-P-56b) - planetary systems - planetary systems
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