HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY
We show that the exoplanet HAT-P-7b has an extremely tilted orbit, with a true angle of at least 86° with respect to its parent star's equatorial plane, and a strong possibility of retrograde motion. We also report evidence for an additional planet or companion star. The evidence for the unpara...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Astronomical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/52004 https://orcid.org/0000-0002-4265-047X |
| _version_ | 1826201230266859520 |
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| author | Winn, Joshua Nathan Johnson, John Asher Albrecht, Simon H. Howard, Andrew W. Marcy, Geoffrey W. Crossfield, Ian J. Holman, Matthew J. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Winn, Joshua Nathan Johnson, John Asher Albrecht, Simon H. Howard, Andrew W. Marcy, Geoffrey W. Crossfield, Ian J. Holman, Matthew J. |
| author_sort | Winn, Joshua Nathan |
| collection | MIT |
| description | We show that the exoplanet HAT-P-7b has an extremely tilted orbit, with a true angle of at least 86° with respect to its parent star's equatorial plane, and a strong possibility of retrograde motion. We also report evidence for an additional planet or companion star. The evidence for the unparalleled orbit and the third body is based on precise observations of the star's apparent radial velocity (RV). The anomalous RV due to rotation (the Rossiter-McLaughlin effect) was found to be a blueshift during the first half of the transit and a redshift during the second half, an inversion of the usual pattern, implying that the angle between the sky-projected orbital and stellar angular momentum vectors is 182fdg5 ± 9fdg4. The third body is implicated by excess RV variation of the host star over 2 yr. Some possible explanations for the tilted orbit of HAT-P-7b are a close encounter with another planet, the Kozai effect, and resonant capture by an inward-migrating outer planet. |
| first_indexed | 2024-09-23T11:48:16Z |
| format | Article |
| id | mit-1721.1/52004 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:48:16Z |
| publishDate | 2010 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/520042022-09-27T22:02:29Z HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY Winn, Joshua Nathan Johnson, John Asher Albrecht, Simon H. Howard, Andrew W. Marcy, Geoffrey W. Crossfield, Ian J. Holman, Matthew J. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Winn, Joshua Nathan Winn, Joshua Nathan Albrecht, Simon H. We show that the exoplanet HAT-P-7b has an extremely tilted orbit, with a true angle of at least 86° with respect to its parent star's equatorial plane, and a strong possibility of retrograde motion. We also report evidence for an additional planet or companion star. The evidence for the unparalleled orbit and the third body is based on precise observations of the star's apparent radial velocity (RV). The anomalous RV due to rotation (the Rossiter-McLaughlin effect) was found to be a blueshift during the first half of the transit and a redshift during the second half, an inversion of the usual pattern, implying that the angle between the sky-projected orbital and stellar angular momentum vectors is 182fdg5 ± 9fdg4. The third body is implicated by excess RV variation of the host star over 2 yr. Some possible explanations for the tilted orbit of HAT-P-7b are a close encounter with another planet, the Kozai effect, and resonant capture by an inward-migrating outer planet. 2010-03-03T15:55:38Z 2010-03-03T15:55:38Z 2009-10 2009-08 Article http://purl.org/eprint/type/SubmittedJournalArticle 2041-8213 2041-8205 http://hdl.handle.net/1721.1/52004 HAT-P-7: A Retrograde or Polar Orbit, and a Third Body Joshua N. Winn, John Asher Johnson, Simon Albrecht, Andrew W. Howard, Geoffrey W. Marcy, Ian J. Crossfield, and Matthew J. Holman 2009 ApJ 703 L99-L103 doi: 10.1088/0004-637X/703/2/L99 https://orcid.org/0000-0002-4265-047X en_US http://dx.doi.org/10.1088/0004-637x/703/2/l99 Astrophysical Journal. Letters Attribution-Noncommercial-Share Alike 3.0 Unported http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf American Astronomical Society Josh Winn |
| spellingShingle | Winn, Joshua Nathan Johnson, John Asher Albrecht, Simon H. Howard, Andrew W. Marcy, Geoffrey W. Crossfield, Ian J. Holman, Matthew J. HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY |
| title | HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY |
| title_full | HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY |
| title_fullStr | HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY |
| title_full_unstemmed | HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY |
| title_short | HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY |
| title_sort | hat p 7 a retrograde or polar orbit and a third body |
| url | http://hdl.handle.net/1721.1/52004 https://orcid.org/0000-0002-4265-047X |
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