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Two Giant Planets Orbiting Rapidly Rotating Stars

9 May 2016, 22:00 UTC
Two Giant Planets Orbiting Rapidly Rotating Stars
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KELT-7b and HAT-P-56b are two hot-Jupitets that orbit rapidly rotating F-type host stars. KELT-7b has 1.28 ± 0.18 times the mass and 1.53 times the radius of Jupiter, while HAT-P-56b has 2.18 ± 0.25 times the mass and 1.47 times the radius of Jupiter. KELT-7b orbits its host star every 2.73 days and the maximum rotation period of its host star is 1.08 ± 0.03 days. HAT-P-56 orbits its host star every 2.79 days and the maximum rotation period of its host star is 1.8 ± 0.2 days. Both KELT-7b and HAT-P-56b belong to a rare class of super-synchronous hot-Jupiters whose orbital periods are longer than the rotation periods of their host stars.A recent study by Zhou et al. (2016) show that the spin-orbit alignments of KELT-7b and HAT-P-56b are 2.8 ± 0.6 degeees and 8 ± 2 degrees, respectively. This means that the orbital planes of both planets are closely aligned with the equatorial planes of their host stars. Planets found in such well-aligned orbits are believed to have migrated towards their host star in the protoplanetary disk via planet-gas interactions. On the contrary, planets found in highly inclined orbits experienced dynamical interactions such as planet-planet scattering events.In the ...

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