THE BANANA PROJECT. V. MISALIGNED AND PRECESSING STELLAR ROTATION AXES IN CV VELORUM
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Winn_The banana project.pdf
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Author(s)
Albrecht, Simon H.
Torres, Guillermo
Fabrycky, Daniel C.
Setiawan, Johny
Jehin, Emmanuel
Triaud, Amaury
Queloz, Didier
Snellen, Ignas
Eggleton, Peter
Winn, Joshua Nathan
Date Issued
March 2014
Journal
The Astrophysical Journal
Publisher
IOP Publishing
Citation
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.
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Author's final manuscript
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1088/0004-637X/785/2/83
