Confirmation of a Retrograde Orbit for Exoplanet Wasp-17b
We present high-precision radial velocity observations of WASP-17 throughout the transit of its close-in giant planet, using the MIKE spectrograph on the 6.5 m Magellan Telescope at Las Campanas Observatory. By modeling the Rossiter-McLaughlin effect, we find the sky-projected spin-orbit angle to be...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | en_US |
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Institute of Physics
2011
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| Online Access: | http://hdl.handle.net/1721.1/62163 https://orcid.org/0000-0002-4265-047X |
| _version_ | 1811080274577981440 |
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| author | Bayliss, Daniel D. R. Winn, Joshua Nathan Mardling, Rosemary A. Sackett, Penny D. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Bayliss, Daniel D. R. Winn, Joshua Nathan Mardling, Rosemary A. Sackett, Penny D. |
| author_sort | Bayliss, Daniel D. R. |
| collection | MIT |
| description | We present high-precision radial velocity observations of WASP-17 throughout the transit of its close-in giant planet, using the MIKE spectrograph on the 6.5 m Magellan Telescope at Las Campanas Observatory. By modeling the Rossiter-McLaughlin effect, we find the sky-projected spin-orbit angle to be [lambda] = 167.4 ± 11.2 deg. This independently confirms the previous finding that WASP-17b is on a retrograde orbit, suggesting it underwent migration via a mechanism other than just the gravitational interaction between the planet and the disk. Interestingly, our result for [lambda] differs by 45 ± 13 deg from the previously announced value, and we also find that the spectroscopic transit occurs 15 ± 5 minutes earlier than expected, based on the published ephemeris. The discrepancy in the ephemeris highlights the need for contemporaneous spectroscopic and photometric transit observations whenever possible. |
| first_indexed | 2024-09-23T11:28:36Z |
| format | Article |
| id | mit-1721.1/62163 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:28:36Z |
| publishDate | 2011 |
| publisher | Institute of Physics |
| record_format | dspace |
| spelling | mit-1721.1/621632022-09-27T19:48:32Z Confirmation of a Retrograde Orbit for Exoplanet Wasp-17b Bayliss, Daniel D. R. Winn, Joshua Nathan Mardling, Rosemary A. Sackett, Penny D. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Winn, Joshua Nathan Winn, Joshua Nathan We present high-precision radial velocity observations of WASP-17 throughout the transit of its close-in giant planet, using the MIKE spectrograph on the 6.5 m Magellan Telescope at Las Campanas Observatory. By modeling the Rossiter-McLaughlin effect, we find the sky-projected spin-orbit angle to be [lambda] = 167.4 ± 11.2 deg. This independently confirms the previous finding that WASP-17b is on a retrograde orbit, suggesting it underwent migration via a mechanism other than just the gravitational interaction between the planet and the disk. Interestingly, our result for [lambda] differs by 45 ± 13 deg from the previously announced value, and we also find that the spectroscopic transit occurs 15 ± 5 minutes earlier than expected, based on the published ephemeris. The discrepancy in the ephemeris highlights the need for contemporaneous spectroscopic and photometric transit observations whenever possible. United States. National Aeronautics and Space Administration (Origins program, award NNX09AD36G) Massachusetts Institute of Technology (Class of 1942) 2011-04-07T20:20:32Z 2011-04-07T20:20:32Z 2010-10 2010-08 Article http://purl.org/eprint/type/JournalArticle 2041-8205 2041-8213 http://hdl.handle.net/1721.1/62163 Bayliss, Daniel D. R. et al. "Confirmation of a Retrograde Orbit for Exoplanet Wasp-17b." 2010 ApJ 722.2 L224-L227 https://orcid.org/0000-0002-4265-047X en_US http://dx.doi.org/10.1088/2041-8205/722/2/l224 Astrophysical Journal Letters Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf Institute of Physics Prof. Winn via Mat Willmott |
| spellingShingle | Bayliss, Daniel D. R. Winn, Joshua Nathan Mardling, Rosemary A. Sackett, Penny D. Confirmation of a Retrograde Orbit for Exoplanet Wasp-17b |
| title | Confirmation of a Retrograde Orbit for Exoplanet Wasp-17b |
| title_full | Confirmation of a Retrograde Orbit for Exoplanet Wasp-17b |
| title_fullStr | Confirmation of a Retrograde Orbit for Exoplanet Wasp-17b |
| title_full_unstemmed | Confirmation of a Retrograde Orbit for Exoplanet Wasp-17b |
| title_short | Confirmation of a Retrograde Orbit for Exoplanet Wasp-17b |
| title_sort | confirmation of a retrograde orbit for exoplanet wasp 17b |
| url | http://hdl.handle.net/1721.1/62163 https://orcid.org/0000-0002-4265-047X |
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