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Spatially resolved eastward winds and rotation of HD 189733b
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Louden, Tom M. and Wheatley, Peter J. (2015) Spatially resolved eastward winds and rotation of HD 189733b. The Astrophysical Journal, 814 (2). pp. 1-6. L24. doi:10.1088/2041-8205/814/2/L24 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/2041-8205/814/2/L24
Abstract
We measure wind velocities on opposite sides of the hot Jupiter HD 189733b by modeling sodium absorption in high-resolution transmission spectra from the High Accuracy Radial Velocity Planet Searcher. Our model implicitly accounts for the Rossiter–McLaughlin effect, which we show can explain the high wind velocities suggested by previous studies. Our results reveal a strong eastward motion of the atmosphere of HD 189733b, with a redshift of ${2.3}_{-1.5}^{+1.3}$ km s−1 on the leading limb of the planet and a blueshift of ${5.3}_{-1.4}^{+1.0}$ km s−1 on the trailing limb. These velocities can be understood as a combination of tidally locked planetary rotation and an eastward equatorial jet, closely matching the predictions of atmospheric circulation models. Our results show that the sodium absorption of HD 189733b is intrinsically velocity broadened, so previous studies of the average transmission spectrum are likely to have overestimated the role of pressure and thermal broadening.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Celestial mechanics, Satellites, Spectroscopic imaging | ||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||
| ISSN: | 0004-637X | ||||||||
| Official Date: | 25 November 2015 | ||||||||
| Dates: |
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| Volume: | 814 | ||||||||
| Number: | 2 | ||||||||
| Number of Pages: | 6 | ||||||||
| Page Range: | pp. 1-6 | ||||||||
| Article Number: | L24 | ||||||||
| DOI: | 10.1088/2041-8205/814/2/L24 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Date of first compliant deposit: | 19 April 2016 | ||||||||
| Date of first compliant Open Access: | 20 April 2016 | ||||||||
| Funder: | Science and Technology Facilities Council (Great Britain) (STFC) | ||||||||
| Grant number: | ST/L000733/7 (STFC) |
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