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  Binary Companions of Evolved Stars in APOGEE DR14: Search Method and Catalog of ∼5000 Companions

Price-Whelan, A. M., Hogg, D. W., Rix, H.-W., De Lee, N., Majewski, S. R., Nidever, D. L., et al. (2018). Binary Companions of Evolved Stars in APOGEE DR14: Search Method and Catalog of ∼5000 Companions. The Astronomical Journal, 156.

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 Creators:
Price-Whelan, Adrian M.1, Author
Hogg, David W.1, Author
Rix, Hans-Walter1, Author
De Lee, Nathan1, Author
Majewski, Steven R.1, Author
Nidever, David L.1, Author
Troup, Nicholas1, Author
Fernández-Trincado, José G.1, Author
García-Hernández, Domingo A.1, Author
Longa-Peña, Penélope1, Author
Nitschelm, Christian1, Author
Sobeck, Jennifer1, Author
Zamora, Olga1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: binaries: spectroscopic methods: data analysis methods: statistical planets and satellites: fundamental parameters surveys techniques: radial velocities Astrophysics - Solar and Stellar Astrophysics
 Abstract: Multi-epoch radial velocity measurements of stars can be used to identify stellar, substellar, and planetary-mass companions. Even a small number of observation epochs can be informative about companions, though there can be multiple qualitatively different orbital solutions that fit the data. We have custom-built a Monte Carlo sampler (The Joker) that delivers reliable (and often highly multimodal) posterior samplings for companion orbital parameters given sparse radial velocity data. Here we use The Joker to perform a search for companions to 96,231 red giant stars observed in the APOGEE survey (DR14) with ≥3 spectroscopic epochs. We select stars with probable companions by making a cut on our posterior belief about the amplitude of the variation in stellar radial velocity induced by the orbit. We provide (1) a catalog of 320 companions for which the stellar companion’s properties can be confidently determined, (2) a catalog of 4898 stars that likely have companions, but would require more observations to uniquely determine the orbital properties, and (3) posterior samplings for the full orbital parameters for all stars in the parent sample. We show the characteristics of systems with confidently determined companion properties and highlight interesting systems with candidate compact object companions.

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 Dates: 2018
 Publication Status: Issued
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Title: The Astronomical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 156 Sequence Number: - Start / End Page: - Identifier: -