Observational constraints on companions inside of 10 AU in the HR 8799 planetary system

Sasha Hinkley*, John M. Carpenter, Michael J. Ireland, Adam L. Kraus

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


We report the results of Keck L′-band non-redundant aperture masking of HR 8799, a system with four confirmed planetary mass companions at projected orbital separations of 14-68 AU. We use these observations to place constraints on the presence of planets and brown dwarfs at projected orbital separations inside of 10 AU - separations out of reach to more conventional direct imaging methods. No companions were detected at better than 99% confidence between orbital separations of 0.8 and 10 AU. Assuming an age of 30 Myr and adopting the Baraffe models, we place upper limits to planetary mass companions of 80, 60, and 11 M Jup at projected orbital separations of 0.8, 1, and 3-10 AU, respectively. Our constraints on massive companions to HR 8799 will help clarify ongoing studies of the orbital stability of this multi-planet system, and may illuminate future work dedicated to understanding the dust-free hole interior to ∼6 AU.

Original languageEnglish
Article numberL21
Pages (from-to)1-5
Number of pages5
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 1 Apr 2011
Externally publishedYes


  • instrumentation: adaptive optics
  • instrumentation: interferometers
  • planets and satellites: detection
  • stars: individual (HR 8799)
  • techniques: high angular resolution


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