HD 202206 : A Circumbinary Brown Dwarf System

Abstract

With Hubble Space Telescope Fine Guidance Sensor astrometry and previously published radial velocity measures we explore the exoplanetary system HD 202206. Our modeling results in a parallax, ${\pi }_{abs}=21.96\pm 0.12$ milliseconds of arc, a mass for HD 202206 B of M${}_B=0.089_{-0.006}^{+0.007}$ Msun, and a mass for HD 202206 c of M${}_c=17.9_{-1.8}^{+2.9}$ MJup. HD 202206 is a nearly face-on G+M binary orbited by a brown dwarf. The system architecture we determine supports past assertions that stability requires a 5:1 mean motion resonance (we find a period ratio, $P_c/P_B=4.92\pm 0.04$) and coplanarity (we find a mutual inclination, Phi = 6 \arcdeg \pm 2 \arcdeg).

Accepted by The Astronomical Journal, April 12, 2017. arXiv admin note: text overlap with arXiv:1003.0421. Revised to include Gaia acknowledgement

References in corpus (6)

• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• The Second-Generation Guide Star Catalog: Description and Properties
• The Exoplanet Orbit Database II: Updates to exoplanets.org
• The Solar Neighborhood XXXVII: The Mass-Luminosity Relation for Main Sequence M Dwarfs
• A Comparison of Stellar Elemental Abundance Techniques and Measurements
• Astrometry with Hubble Space Telescope Fine Guidance Sensors - A Review