The BANANA Project. VII. High Eccentricity Predicts Spin-Orbit Misalignment in Binaries
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917742173487104 |
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| author | Marcussen, Marcus L. Albrecht, Simon H. Winn, Joshua N. Su, Yubo Lundkvist, Mia S. Schlaufman, Kevin C. |
| author_facet | Marcussen, Marcus L. Albrecht, Simon H. Winn, Joshua N. Su, Yubo Lundkvist, Mia S. Schlaufman, Kevin C. |
| contents | The degree of spin-orbit alignment in a population of binary stars can be determined from measurements of their orbital inclinations and rotational broadening of their spectral lines. Alignment in a face-on binary guarantees low rotational broadening, while alignment in an edge-on binary maximizes the rotational broadening. In contrast, if spin-orbit angles ($ψ$) are random, rotational broadening should not depend on orbital inclination. Using this technique, we investigated a sample of 2{,}727 astrometric binaries from Gaia DR3 with F-type primaries and orbital periods between 50 and 1000 days (separations 0.3--2.7~au). We found that $ψ$ is strongly associated with $e$, the orbital eccentricity. When $e<0.15$, the mean spin-orbit angle is $\langleψ\rangle = 6.9_{-4.1}^{+5.4}$\,degrees, while for $e>0.7$, it rises to $\langleψ\rangle = 46_{-24}^{+26}$\,degrees. These results suggest that some binaries are affected by processes during their formation or evolution that excite both orbital eccentricity and inclination. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_03072 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The BANANA Project. VII. High Eccentricity Predicts Spin-Orbit Misalignment in Binaries Marcussen, Marcus L. Albrecht, Simon H. Winn, Joshua N. Su, Yubo Lundkvist, Mia S. Schlaufman, Kevin C. Solar and Stellar Astrophysics Earth and Planetary Astrophysics The degree of spin-orbit alignment in a population of binary stars can be determined from measurements of their orbital inclinations and rotational broadening of their spectral lines. Alignment in a face-on binary guarantees low rotational broadening, while alignment in an edge-on binary maximizes the rotational broadening. In contrast, if spin-orbit angles ($ψ$) are random, rotational broadening should not depend on orbital inclination. Using this technique, we investigated a sample of 2{,}727 astrometric binaries from Gaia DR3 with F-type primaries and orbital periods between 50 and 1000 days (separations 0.3--2.7~au). We found that $ψ$ is strongly associated with $e$, the orbital eccentricity. When $e<0.15$, the mean spin-orbit angle is $\langleψ\rangle = 6.9_{-4.1}^{+5.4}$\,degrees, while for $e>0.7$, it rises to $\langleψ\rangle = 46_{-24}^{+26}$\,degrees. These results suggest that some binaries are affected by processes during their formation or evolution that excite both orbital eccentricity and inclination. |
| title | The BANANA Project. VII. High Eccentricity Predicts Spin-Orbit Misalignment in Binaries |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2408.03072 |