Stellar obliquities and planetary alignments (SOPA). I. Spin-orbit measurements of three transiting hot Jupiters: WASP-72b, WASP-100b, and WASP-109b
Article
Article Title | Stellar obliquities and planetary alignments (SOPA). I. Spin-orbit measurements of three transiting hot Jupiters: WASP-72b, WASP-100b, and WASP-109b |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Addison, B. C. (Author), Wang, Songhu (Author), Johnson, M. C. (Author), Tinney, C. G. (Author), Wright, D. J. (Author) and Bayliss, D. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 156 (5), pp. 1-12 |
Article Number | 197 |
Number of Pages | 12 |
Year | 2018 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/aade91 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/aade91 |
Abstract | We report measurements of the sky-projected spin-orbit angles for three transiting hot Jupiters, two of which are in nearly polar orbits, WASP-100b and WASP-109b, and a third in a low-obliquity orbit, WASP-72b. We obtained these measurements by observing the Rossiter-McLaughlin effect over the course of the transits from high-resolution spectroscopic observations made with the CYCLOPS2 optical fiber bundle system feeding the UCLES spectrograph on the Anglo-Australian Telescope. The resulting sky-projected spin-orbit angles are lambda = 7 degrees(+11)(-12 degrees)degrees, lambda = 79 degrees(+19)(-10 degrees)degrees, and lambda = 99 degrees(+10)(-9 degrees)degrees for WASP-72b, WASP-100b, and WASP-109b, respectively. These results suggests that WASP-100b and WASP-109b are on highly inclined orbits tilted nearly 90 degrees from their host star's equator, while the orbit of WASP-72b appears to be well-aligned. WASP-72b is a typical hot Jupiter orbiting a mid-late F star (F7 with T-eff = 6250 +/- 120 K). WASP-100b and WASP-109b are highly irradiated bloated hot Jupiters orbiting hot early-mid F stars (F2 with T-eff = 6900 +/- 120 K and F4 with T-eff = 6520 +/- 140 K), making them consistent with the trends observed for the majority of stars hosting planets on high-obliquity orbits. |
Keywords | planets and satellites, dynamical evolution and stability, stars, WASP-72, WASP-100, WASP-109, radial velocities |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | Mississippi State University, United States |
Yale University, United States | |
Ohio State University, United States | |
University of New South Wales | |
Centre for Astrophysics | |
University of Warwick, United Kingdom | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q53q3/stellar-obliquities-and-planetary-alignments-sopa-i-spin-orbit-measurements-of-three-transiting-hot-jupiters-wasp-72b-wasp-100b-and-wasp-109b
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