Assessing Spectroscopic-Binary Multiplicity Properties Using Robo-AO Imaging. (arXiv:2009.00575v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Laos_S/0/1/0/all/0/1">Stefan Laos</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stassun_K/0/1/0/all/0/1">Keivan G. Stassun</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mathieu_R/0/1/0/all/0/1">Robert D. Mathieu</a>
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.
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.
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