The Solar Neighborhood. XLVI. Revealing New M Dwarf Binaries and their Orbital Architectures
| Autor: | Eliot Halley Vrijmoet, Todd J. Henry, Serge B. Dieterich, Wei-Chun Jao |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Earth and Planetary Astrophysics (astro-ph.EP) 010504 meteorology & atmospheric sciences Red dwarf Binary number Astronomy FOS: Physical sciences Astronomy and Astrophysics Astrometry 01 natural sciences Stars Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Planet 0103 physical sciences Binary star Parallax 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics - Earth and Planetary Astrophysics 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.2009.00121 |
| Popis: | We use 20 years of astrometric data from the RECONS program on the CTIO/SMARTS 0.9-m to provide new insight into multiple star systems in the solar neighborhood. We provide new and updated parallaxes for 210 systems and derive nine high-quality astrometric orbits with periods of 2.49 - 16.63 years. Using a total of 542 systems' parallaxes from RECONS, we compare systems within 25 parsecs to Gaia DR2 to define criteria for selecting unresolved astrometric multiples from the DR2 results. We find that three out of four unresolved multi-star red dwarf systems within 25 pc in DR2 have parallax_error $\geq 0.32$ mas, astrometric_gof_al $\geq 56$, astrometric_excess_noise_sig $\geq 108.0$, ruwe $\geq 2.0$, and parallaxes more than $\sim$10% different than the long-term RECONS results. These criteria have broad applications to any work targeting nearby stars, from studies seeking binary systems to efforts targeting single stars for planet searches. Comment: Accepted for publication in The Astronomical Journal. 23 pages, 7 figures, 3 tables. Contact corresponding author for full electronic tables |
| Databáze: | OpenAIRE |
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