THE BANANA PROJECT. V. MISALIGNED AND PRECESSING STELLAR ROTATION AXES IN CV VELORUM
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; Gillon, M.; ... Show more Show less
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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.
Date issued
2014-03Department
Massachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space ResearchJournal
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.
Version: Author's final manuscript
ISSN
0004-637X
1538-4357