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- W2088890734 abstract "We report the sky-projected orbital obliquity (spin-orbit angle) of WASP-84b, a 0.70-$M_{rm Jup}$ planet in a 8.52-day orbit around a G9V/K0V star, to be $lambda = 0.3 pm 1.7^circ$. We obtain a true obliquity of $psi = 14.8 pm 8.0^circ$ from a measurement of the inclination of the stellar spin axis with respect to the sky plane. Due to the young age and the weak tidal forcing of the system, we suggest that the orbit of WASP-84b is unlikely to have both realigned and circularised from the misaligned and/or eccentric orbit likely to have arisen from high-eccentricity migration. Therefore we conclude that the planet probably migrated via interaction with the protoplanetary disc. This would make it the first short-orbit, giant planet to have been shown to have migrated via this pathway. Further, we argue that the distribution of obliquities for planets orbiting cool stars ($T_{rm eff}$ < 6250 K) suggests that high-eccentricity migration is an important pathway for the formation of short-orbit, giant planets." @default.
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- W2088890734 date "2015-02-09" @default.
- W2088890734 modified "2023-10-01" @default.
- W2088890734 title "THE WELL-ALIGNED ORBIT OF WASP-84b: EVIDENCE FOR DISK MIGRATION OF A HOT JUPITER" @default.
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- W2088890734 doi "https://doi.org/10.1088/2041-8205/800/1/l9" @default.
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