THE BANANA PROJECT. V. MISALIGNED AND PRECESSING STELLAR ROTATION AXES IN CV VELORUM
As part of the Binaries Are Not Always Neatly Aligned project (BANANA), we have found that the eclipsing binary CV Velorum has misaligned rotation axes. Based on our analysis of the Rossiter-McLaughlin effect, we find sky-projected spin-orbit angles of β[subscript p] = –52° ± 6° and β[subscript s] =...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2014
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| Online Access: | http://hdl.handle.net/1721.1/88675 https://orcid.org/0000-0002-5510-8751 https://orcid.org/0000-0002-4265-047X |
| _version_ | 1826213818894647296 |
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| author | Albrecht, Simon H. Torres, Guillermo Fabrycky, Daniel C. Setiawan, Johny Jehin, Emmanuel Triaud, Amaury Queloz, Didier Snellen, Ignas Eggleton, Peter Winn, Joshua Nathan Gillon, M. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Albrecht, Simon H. Torres, Guillermo Fabrycky, Daniel C. Setiawan, Johny Jehin, Emmanuel Triaud, Amaury Queloz, Didier Snellen, Ignas Eggleton, Peter Winn, Joshua Nathan Gillon, M. |
| author_sort | Albrecht, Simon H. |
| collection | MIT |
| description | As part of the Binaries Are Not Always Neatly Aligned project (BANANA), we have found that the eclipsing binary CV Velorum has misaligned rotation axes. Based on our analysis of the Rossiter-McLaughlin effect, we find sky-projected spin-orbit angles of β[subscript p] = –52° ± 6° and β[subscript s] = 3° ± 7° for the primary and secondary stars (B2.5V + B2.5V, P = 6.9 days). We combine this information with several measurements of changing projected stellar rotation speeds (vsin i [star]) over the last 30 yr, leading to a model in which the primary star's obliquity is ≈65°, and its spin axis precesses around the total angular momentum vector with a period of about 140 yr. The geometry of the secondary star is less clear, although a significant obliquity is also implicated by the observed time variations in the vsin i [star]. By integrating the secular tidal evolution equations backward in time, we find that the system could have evolved from a state of even stronger misalignment similar to DI Herculis, a younger but otherwise comparable binary. |
| first_indexed | 2024-09-23T15:55:20Z |
| format | Article |
| id | mit-1721.1/88675 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:55:20Z |
| publishDate | 2014 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/886752022-09-29T17:03:08Z THE BANANA PROJECT. V. MISALIGNED AND PRECESSING STELLAR ROTATION AXES IN CV VELORUM Albrecht, Simon H. Torres, Guillermo Fabrycky, Daniel C. Setiawan, Johny Jehin, Emmanuel Triaud, Amaury Queloz, Didier Snellen, Ignas Eggleton, Peter Winn, Joshua Nathan Gillon, M. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Albrecht, Simon H. Winn, Joshua Nathan Triaud, Amaury As part of the Binaries Are Not Always Neatly Aligned project (BANANA), we have found that the eclipsing binary CV Velorum has misaligned rotation axes. Based on our analysis of the Rossiter-McLaughlin effect, we find sky-projected spin-orbit angles of β[subscript p] = –52° ± 6° and β[subscript s] = 3° ± 7° for the primary and secondary stars (B2.5V + B2.5V, P = 6.9 days). We combine this information with several measurements of changing projected stellar rotation speeds (vsin i [star]) over the last 30 yr, leading to a model in which the primary star's obliquity is ≈65°, and its spin axis precesses around the total angular momentum vector with a period of about 140 yr. The geometry of the secondary star is less clear, although a significant obliquity is also implicated by the observed time variations in the vsin i [star]. By integrating the secular tidal evolution equations backward in time, we find that the system could have evolved from a state of even stronger misalignment similar to DI Herculis, a younger but otherwise comparable binary. United States. National Aeronautics and Space Administration (Origins Award NNX09AB33G) National Science Foundation (U.S.) (Grant 1108595) 2014-08-11T18:04:34Z 2014-08-11T18:04:34Z 2014-03 2013-12 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/88675 Albrecht, Simon, Joshua N. Winn, Guillermo Torres, Daniel C. Fabrycky, Johny Setiawan, Michael Gillon, Emmanuel Jehin, et al. “THE BANANA PROJECT. V. MISALIGNED AND PRECESSING STELLAR ROTATION AXES IN CV VELORUM.” The Astrophysical Journal 785, no. 2 (April 20, 2014): 83. https://orcid.org/0000-0002-5510-8751 https://orcid.org/0000-0002-4265-047X en_US http://dx.doi.org/10.1088/0004-637X/785/2/83 The Astrophysical Journal Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf IOP Publishing arXiv |
| spellingShingle | Albrecht, Simon H. Torres, Guillermo Fabrycky, Daniel C. Setiawan, Johny Jehin, Emmanuel Triaud, Amaury Queloz, Didier Snellen, Ignas Eggleton, Peter Winn, Joshua Nathan Gillon, M. THE BANANA PROJECT. V. MISALIGNED AND PRECESSING STELLAR ROTATION AXES IN CV VELORUM |
| title | THE BANANA PROJECT. V. MISALIGNED AND PRECESSING STELLAR ROTATION AXES IN CV VELORUM |
| title_full | THE BANANA PROJECT. V. MISALIGNED AND PRECESSING STELLAR ROTATION AXES IN CV VELORUM |
| title_fullStr | THE BANANA PROJECT. V. MISALIGNED AND PRECESSING STELLAR ROTATION AXES IN CV VELORUM |
| title_full_unstemmed | THE BANANA PROJECT. V. MISALIGNED AND PRECESSING STELLAR ROTATION AXES IN CV VELORUM |
| title_short | THE BANANA PROJECT. V. MISALIGNED AND PRECESSING STELLAR ROTATION AXES IN CV VELORUM |
| title_sort | banana project v misaligned and precessing stellar rotation axes in cv velorum |
| url | http://hdl.handle.net/1721.1/88675 https://orcid.org/0000-0002-5510-8751 https://orcid.org/0000-0002-4265-047X |
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