SIMBAD references

2021ApJ...915L..16B - Astrophys. J., 915, L16-L16 (2021/July-1)

The first dynamical mass measurement in the HR 8799 system.


Abstract (from CDS):

HR 8799 hosts four directly imaged giant planets, but none has a mass measured from first principles. We present the first dynamical mass measurement in this planetary system, finding that the innermost planet HR 8799 e has a mass of 9.6–1.8+1.9MJup. This mass results from combining the well-characterized orbits of all four planets with a new astrometric acceleration detection (5σ) from the Gaia EDR3 version of the Hipparcos-Gaia Catalog of Accelerations. We find with 95% confidence that HR 8799 e is below 13 MJup, the deuterium-fusing mass limit. We derive a hot-start cooling age of 42–16+24 Myr for HR 8799 e that agrees well with its hypothesized membership in the Columba association but is also consistent with an alternative suggested membership in the β Pictoris moving group. We exclude the presence of any additional >=5 - MJup planets interior to HR 8799 e with semimajor axes between ≃3-16 au. We provide proper motion anomalies and a matrix equation to solve for the mass of any of the planets of HR 8799 using only mass ratios between the planets.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Exoplanets - Extrasolar gaseous planets - Astrometry - Orbit determination

Simbad objects: 10

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