Assessing Spectroscopic-Binary Multiplicity Properties Using Robo-AO Imaging
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arXiv
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| Format: | Preprint |
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2020
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| _version_ | 1866914992403513344 |
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| author | Laos, Emily Stassun, Keivan G. Mathieu, Robert D. |
| author_facet | Laos, Emily Stassun, Keivan G. Mathieu, Robert D. |
| contents | We present higher-order multiplicity results for 60 solar-type spectroscopic binaries based on 0.75 micron imaging data taken by the Robotic Adaptive Optics system (Robo-AO) at the Kitt Peak 2.1m telescope. Our contrast curves show sensitivity of up to ~5 mag at ~1 arcsecond separation. We find tertiary companions for 62% of our binaries overall, but find this fraction is a strong function of the inner binary orbital period; it ranges from ~47% for P_{binary} > 30 days to as high as ~90% for P_{binary} <= 5 days. We similarly find increasing tertiary companion frequency for shorter period binaries in a secondary sample of Kepler eclipsing binaries observed by Robo-AO. Using Gaia distances, we estimate an upper limit orbital period for each tertiary companion and compare the tertiary-to-binary period ratios for systems in the field versus those in star-forming regions. Taken all together, these results provide further evidence for angular momentum transfer from three-body interactions, resulting in tight binaries with tertiaries that widen from pre-main-sequence to field ages. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2009_00575 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Assessing Spectroscopic-Binary Multiplicity Properties Using Robo-AO Imaging Laos, Emily Stassun, Keivan G. Mathieu, Robert D. Solar and Stellar Astrophysics Earth and Planetary Astrophysics We present higher-order multiplicity results for 60 solar-type spectroscopic binaries based on 0.75 micron imaging data taken by the Robotic Adaptive Optics system (Robo-AO) at the Kitt Peak 2.1m telescope. Our contrast curves show sensitivity of up to ~5 mag at ~1 arcsecond separation. We find tertiary companions for 62% of our binaries overall, but find this fraction is a strong function of the inner binary orbital period; it ranges from ~47% for P_{binary} > 30 days to as high as ~90% for P_{binary} <= 5 days. We similarly find increasing tertiary companion frequency for shorter period binaries in a secondary sample of Kepler eclipsing binaries observed by Robo-AO. Using Gaia distances, we estimate an upper limit orbital period for each tertiary companion and compare the tertiary-to-binary period ratios for systems in the field versus those in star-forming regions. Taken all together, these results provide further evidence for angular momentum transfer from three-body interactions, resulting in tight binaries with tertiaries that widen from pre-main-sequence to field ages. |
| title | Assessing Spectroscopic-Binary Multiplicity Properties Using Robo-AO Imaging |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2009.00575 |