ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astronomical Journal Year : 2022

ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI

Tyler Gardner
  • Function : Author
John D. Monnier
  • Function : Author
Francis C. Fekel
  • Function : Author
Adam Scovera
  • Function : Author
Gail Schaefer
  • Function : Author
Stefan Kraus
  • Function : Author
Fred C. Adams
  • Function : Author
Narsireddy Anugu
  • Function : Author
Theo ten Brummelaar
  • Function : Author
Claire L. Davies
  • Function : Author
Jacob Ennis
  • Function : Author
Douglas R. Gies
  • Function : Author
Keith J. C. Johnson
  • Function : Author
Kaitlin M. Kratter
  • Function : Author
Aaron Labdon
  • Function : Author
Cyprien Lanthermann
  • Function : Author
Johannes Sahlmann
  • Function : Author
Benjamin R. Setterholm
  • Function : Author

Abstract

We started a survey with CHARA/MIRC-X and VLTI/GRAVITY to search for low-mass companions orbiting individual components of intermediate-mass binary systems. With the incredible precision of these instruments, we can detect astrometric "wobbles" from companions down to a few tens of microarcseconds. This allows us to detect any previously unseen triple systems in our list of binaries. We present the orbits of 12 companions around early F- to B-type binaries, 9 of which are new detections and 3 of which are first astrometric detections of known radial velocity (RV) companions. The masses of these newly detected components range from 0.45 to 1.3 M . Our orbits constrain these systems to a high astrometric precision, with median residuals to the orbital fit of 20-50 μas in most cases. For seven of these systems we include newly obtained RV data, which help us to identify the system configuration and to solve for masses of individual components in some cases. Although additional RV measurements are needed to break degeneracy in the mutual inclination, we find that the majority of these inner triples are not well aligned with the wide binary orbit. This hints that higher-mass triples are more misaligned compared to solar and lower-mass triples, though a thorough study of survey biases is needed. We show that the ARMADA survey is extremely successful at uncovering previously unseen companions in binaries. This method will be used in upcoming papers to constrain companion demographics in intermediate-mass binary systems down to the planetary-mass regime.
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insu-03860262 , version 1 (19-11-2022)

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Tyler Gardner, John D. Monnier, Francis C. Fekel, Jean-Baptiste Le Bouquin, Adam Scovera, et al.. ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI. The Astronomical Journal, 2022, 164, ⟨10.3847/1538-3881/ac8eae⟩. ⟨insu-03860262⟩
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