The Aligned Orbit of the Eccentric Warm Jupiter K2-232b
Article
Article Title | The Aligned Orbit of the Eccentric Warm Jupiter K2-232b |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Wang, Songhu (Author), Winn, Joshua N. (Author), Addison, Brett C. (Author), Dai, Fei (Author), Rice, Malena (Author), Holden, Bradford (Author), Burt, Jennifer A. (Author), Wang, Xian-Yu (Author), Butler, R. Paul (Author), Vogt, Steven S. (Author) and Laughlin, Gregory (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 162 (2), pp. 1-6 |
Article Number | 50 |
Number of Pages | 6 |
Year | 2021 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ac0626 |
Web Address (URL) | https://iopscience.iop.org/article/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 K2-232 b, a warm Jupiter 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 λ = -11.°1 ± 6.°6. 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 6000 K. This pattern suggests that the obliquities of the closest-orbiting giant planets around cooler stars have been damped by tidal effects. |
Keywords | Extrasolar planets; Spin; Star; Binary; Retrograde; Alignment; Evolution; Rotation; Exoplanets; 498; Astrophysics - Earth and Planetary Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Indiana University Bloomington, United States |
Princeton University, United States | |
Centre for Astrophysics | |
California Institute of Technology (Caltech), United States | |
Yale University, United States | |
University of California, United States | |
Chinese Academy of Sciences, China | |
Carnegie Institution of Washington, United States |
https://research.usq.edu.au/item/q6wv4/the-aligned-orbit-of-the-eccentric-warm-jupiter-k2-232b
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