Binary Companions of Evolved Stars in APOGEE DR14: Search Method and Catalog of ∼5000 Companions
Top Cited Papers
- 30 June 2018
- journal article
- research article
- Published by American Astronomical Society in The Astronomical Journal
- Vol. 156 (1), 18
- https://doi.org/10.3847/1538-3881/aac387
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.Keywords
This publication has 39 references indexed in Scilit:
- Discovery and characterization of 3000+main-sequence binaries from APOGEE spectraMonthly Notices of the Royal Astronomical Society, 2018
- The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the Extended Baryon Oscillation Spectroscopic Survey and from the Second Phase of the Apache Point Observatory Galactic Evolution ExperimentThe Astrophysical Journal Supplement Series, 2018
- Stellar Multiplicity Meets Stellar Evolution and Metallicity: The APOGEE ViewThe Astrophysical Journal, 2018
- Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant UniverseThe Astronomical Journal, 2017
- Astropy: A community Python package for astronomyAstronomy & Astrophysics, 2013
- Stellar MultiplicityAnnual Review of Astronomy and Astrophysics, 2013
- VERY LOW MASS STELLAR AND SUBSTELLAR COMPANIONS TO SOLAR-LIKE STARS FROM MARVELS. V. A LOW ECCENTRICITY BROWN DWARF FROM THE DRIEST PART OF THE DESERT, MARVELS-6bThe Astronomical Journal, 2013
- emcee: The MCMC HammerPublications of the Astronomical Society of the Pacific, 2013
- GALEX catalogs of UV sources: statistical properties and sample science applications: hot white dwarfs in the Milky WayAstrophysics and Space Science, 2011
- Approximations to the radii of Roche lobesThe Astrophysical Journal, 1983