The Gaia DR2 parallax zero point: Hierarchical modeling of red clump stars

20 Mar 2020 Chan Victor C. Bovy Jo

The systematic offset of Gaia parallaxes has been widely reported with Gaia's second data release, and it is expected to persist in future Gaia data. In order to use Gaia parallaxes to infer distances to high precision, we develop a hierarchical probabilistic model to determine the Gaia parallax zero point offset along with the calibration of an empirical model for luminosity of red clump stars by combining astrometric and photometric measurements... (read more)

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Categories


  • SOLAR AND STELLAR ASTROPHYSICS
  • ASTROPHYSICS OF GALAXIES