Inferring binary and trinary stellar populations in photometric and astrometric surveys

Abstract

Multiple stellar systems are ubiquitous in the Milky Way, but are often unresolved and seen as single objects in spectroscopic, photometric, and astrometric surveys. Yet, modeling them is essential for developing a full understanding of large surveys such as Gaia, and connecting them to stellar and Galactic models. In this paper we address this problem by jointly fitting the Gaia and 2MASS photometric and astrometric data using a data-driven Bayesian hierarchical model that includes populations of binary and trinary systems. This allows us to classify observations into singles, binaries, and trinaries, in a robust and efficient manner, without resorting to external models. We are able to identify multiple systems and, in some cases, make strong predictions for the properties of its unresolved stars. We will be able to compare such predictions with Gaia Data Release 4, which will contain astrometric identification and analysis of binary systems.

19 pages, 9 figures

References in corpus (6)

• The Gaia mission
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• Signatures of unresolved binaries in stellar spectra: implications for spectral fitting
• Searching for giga-Jansky fast radio bursts from the Milky Way with a global array of low-cost radio receivers
• Hierarchical probabilistic inference of the color-magnitude diagram and shrinkage of stellar distance uncertainties

Cited by in corpus (12)

• Gaia Early Data Release 3: The Gaia Catalogue of Nearby Stars
• Imprints of white dwarf recoil in the separation distribution of Gaia wide binaries
• Binary deviations from single object astrometry
• The Separation Distribution of Ultra-Wide Binaries across Galactic Populations
• MINESweeper: Spectrophotometric Modeling of Stars in the Gaia Era
• The Gaia-ESO Survey: detection and characterization of single line spectroscopic binaries
• The distribution of relative proper motions of wide binaries in GAIA DR2: MOND or multiplicity?
• Bayesian Characterization of Main Sequence Binaries in the Old Open Cluster NGC 188
• The GALAH survey: unresolved triple Sun-like stars discovered by the Gaia mission
• High Velocity Runaway Binaries from Supernovae in Triple Systems
• PSF-based Analysis for Detecting Unresolved Wide Binaries
• Inferring properties of the local white dwarf population in astrometric and photometric surveys