Stellar and substellar companions from Gaia EDR3. Proper motion anomaly and resolved common proper-motion pairs

  title={Stellar and substellar companions from Gaia EDR3. Proper motion anomaly and resolved common proper-motion pairs},
  author={Pierre Kervella and Fr{\'e}d{\'e}ric Arenou and F. Th'evenin},
  journal={Astronomy \& Astrophysics},
Context. The multiplicity fraction of stars, down to the substellar regime, is a parameter of fundamental importance for stellar formation, evolution, and planetology. The census of multiple stars in the solar neighborhood is however incomplete. Aims. Our study is aimed at detecting companions of Hipparcos catalog stars from the proper motion anomaly (PMa) they induce on their host star, namely, the difference between their long-term Hipparcos-Gaia and short-term Gaia proper motion vectors. We… 
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