The Aligned Orbit of the Eccentric Warm Jupiter K2-232b
arXiv:2105.12902 · doi:10.3847/1538-3881/ac0626
Abstract
Measuring the obliquity distribution of stars hosting warm Jupiters may help us to understand the formation of close-orbiting gas giants. Few such measurements have been performed due to practical difficulties in scheduling observations of the relatively infrequent and long-duration transits of warm Jupiters. Here, we report a measurement of the Rossiter-McLaughlin effect for K2-232b, a warm Jupiter (M_P=0.39 M_Jup) on an 11.17-day orbit with an eccentricity of 0.26. The data were obtained with the Automated Planet Finder during two separate transits. The planet's orbit appears to be well-aligned with the spin axis of the host star, with a projected spin-orbit angle of lambda = -11.1+/-6.6 deg. Combined with the other available data, we find that high obliquities are almost exclusively associated with planets that either have an orbital separation greater than 10 stellar radii or orbit stars with effective temperatures hotter than 6,000K. This pattern suggests that the obliquities of the closest-orbiting giant planets around cooler stars have been damped by tidal effects.
Accepted for publication in AJ, 8 Pages, 4 Figures
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- Evidence for Hidden Nearby Companions to Hot Jupiters
- A Tendency Toward Alignment in Single-Star Warm Jupiter Systems
- The Spin-Orbit Misalignment of TOI-1842b: The First Measurement of the Rossiter-McLaughlin Effect for a Warm Sub-Saturn around a Massive Star
- A High-Eccentricity Warm Jupiter Orbiting TOI-4127
- Revisiting the Full Sets of Orbital Parameters for the XO-3 System: No evidence for Temporal Variation of the Spin-Orbit Angle
- The Aligned Orbit of a Hot Jupiter around the M Dwarf TOI-4201