A high stellar obliquity in the WASP-7 exoplanetary system
Article
Article Title | A high stellar obliquity in the WASP-7 exoplanetary system |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Albrecht, Simon (Author), Winn, Joshua N. (Author), Butler, R. Paul (Author), Crane, Jeffrey D. (Author), Shectman, Stephen A. (Author), Thompson, Ian B. (Author), Hirano, Teruyuki (Author) and Wittenmyer, Robert A. (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 744 (2) |
Article Number | 189 |
Number of Pages | 9 |
Year | 2012 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0004-637X/744/2/189 |
Web Address (URL) | http://iopscience.iop.org/article/10.1088/0004-637X/744/2/189 |
Abstract | We measure a tilt of 86° ± 6° between the sky projections of the rotation axis of the WASP-7 star and the orbital axis of its close-in giant planet. This measurement is based on observations of the Rossiter-McLaughlin (RM) effect with the Planet Finder Spectrograph on the Magellan II telescope. The result conforms with the previously noted pattern among hot-Jupiter hosts, namely, that the hosts lacking thick convective envelopes have high obliquities. Because the planet's trajectory crosses a wide range of stellar latitudes, observations of the RM effect can in principle reveal the stellar differential rotation profile; however, with the present data the signal of differential rotation could not be detected. The host star is found to exhibit radial-velocity noise ('stellar jitter') with an amplitude of ≈ 30 m s-1 over a timescale of days. |
Keywords | planetary systems; planets and satellites; formation; planetstar interactions; individual stars (WASP-7); stars; rotation; spectroscopic techniques |
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 | Massachusetts Institute of Technology, United States |
Carnegie Institution of Washington, United States | |
Carnegie Observatories Pasadena, United States | |
University of Tokyo, Japan | |
University of New South Wales | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q41v9/a-high-stellar-obliquity-in-the-wasp-7-exoplanetary-system
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