ORBITAL ARCHITECTURES OF PLANET-HOSTING BINARIES. I. FORMING FIVE SMALL PLANETS IN THE TRUNCATED DISK OF KEPLER-444A

We present the first results from our Keck program investigating the orbital architectures of planet-hosting multiple star systems. We combine our Keck/NIRC2 adaptive optics astrometry with multi-epoch Keck/HIRES RVs of all three stars to determine a precise orbit for the BC pair around A, given the...

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Bibliographic Details
Published in:	The Astrophysical journal 2016-01, Vol.817 (1), p.80
Main Authors:	Dupuy, Trent J, Kratter, Kaitlin M, Kraus, Adam L, Isaacson, Howard, Mann, Andrew W, Ireland, Michael J, Howard, Andrew W, Huber, Daniel
Format:	Article
Language:	eng
Subjects:	Adaptive optics Architecture Dynamical systems Orbitals Planet formation Planets Precession Stars
Online Access:	Get full text
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Summary:	We present the first results from our Keck program investigating the orbital architectures of planet-hosting multiple star systems. We combine our Keck/NIRC2 adaptive optics astrometry with multi-epoch Keck/HIRES RVs of all three stars to determine a precise orbit for the BC pair around A, given their empirically constrained masses. We measure minimal astrometric motion, but our RVs reveal significant orbital velocity and acceleration. We validate that the system is dynamically stable in its present configuration via n-body simulations. We find that the A-BC orbit and planetary orbits are likely aligned (98%) given that they both have edge-on orbits and misalignment induces precession of the planets out of transit. We conclude that the stars were likely on their current orbits during the epoch of planet formation, truncating the protoplanetary disk at ~2 AU.
ISSN:	0004-637X 1538-4357