A High Obliquity Orbit for the Hot-Jupiter HATS-14b Transiting a 5400K Star
Article
Article Title | A High Obliquity Orbit for the Hot-Jupiter HATS-14b Transiting a 5400K Star |
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ERA Journal ID | 45091 |
Article Category | Article |
Authors | Zhou, G. (Author), Bayliss, D. (Author), Hartman, J. D. (Author), Fulton, B. J. (Author), Bakos, G. A. (Author), Howard, A. W. (Author), Isaacson, H. (Author), Marcy, G. W. (Author), Schmidt, B. P. (Author), Brahm, R. (Author) and Jordan, A. (Author) |
Journal Title | The Astrophysical Journal Letters |
Journal Citation | 814 (1), pp. 1-6 |
Article Number | L16 |
Number of Pages | 6 |
Year | 2015 |
Publisher | IOP Publishing |
Place of Publication | United Kingdom |
ISSN | 2041-8205 |
2041-8213 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/2041-8205/814/1/l16 |
Web Address (URL) | https://iopscience.iop.org/article/10.1088/2041-8205/814/1/L16 |
Abstract | We report a spin¡Vorbit misalignment for the hot-Jupiter HATS-14b, measuring a projected orbital obliquity of λ= 76 +4°-5° HATS-14b orbits a high metallicity, 5400 K G dwarf in a relatively short period orbit of 2.8 days. This obliquity was measured via the Rossiter¡VMcLaughlin effect, obtained with observations from Keck-HIRES. The velocities were extracted using a novel technique, optimized for low signal-to-noise spectra, achieving a high precision of 4 m s 1 - point-to-point scatter. However, we caution that our uncertainties may be underestimated. Due to the low rotational velocity of the star, the detection significance is dependent on thev i sin prior that is imposed in our modeling. Based on trends observed in the sample of hot Jupiters with obliquity measurements, it has been suggested that these planets modify the spin axes of their host stars, with an efficiency that depends on the stellar type and orbital period of the system. In this framework, short-period planets around stars with surface convective envelopes, like HATS-14b, are expected to have orbits that are aligned with the spin axes of their host stars. HATS-14b, however, is a significant outlier from this trend, challenging the effectiveness of the tidal realignment mechanism. |
Keywords | planetary systems; planets and satellites: individual: HATS-14b; 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. |
Byline Affiliations | Center for Astrophysics Harvard and Smithsonian, United States |
University of Geneva, Switzerland | |
Princeton University, United States | |
University of Hawaii, United States | |
University of California, United States | |
Australian National University | |
Pontifical Catholic University of Chile, Chile | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6x72/a-high-obliquity-orbit-for-the-hot-jupiter-hats-14b-transiting-a-5400k-star
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