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Title: THE THREE-DIMENSIONAL ARCHITECTURE OF THE υ ANDROMEDAE PLANETARY SYSTEM

The υ Andromedae system is the first exoplanetary system to have the relative inclination of two planets' orbital planes directly measured, and therefore offers our first window into the three-dimensional configurations of planetary systems. We present, for the first time, full three-dimensional, dynamically stable configurations for the three planets of the system consistent with all observational constraints. While the outer two planets, c and d, are inclined by ∼30°, the inner planet's orbital plane has not been detected. We use N-body simulations to search for stable three-planet configurations that are consistent with the combined radial velocity and astrometric solution. We find that only 10 trials out of 1000 are robustly stable on 100 Myr timescales, or ∼8 billion orbits of planet b. Planet b's orbit must lie near the invariable plane of planets c and d, but can be either prograde or retrograde. These solutions predict that b's mass is in the range of 2-9 M {sub Jup} and has an inclination angle from the sky plane of less than 25°. Combined with brightness variations in the combined star/planet light curve ({sup p}hase curve{sup )}, our results imply that planet b's radius is ∼1.8 R {sub Jup}, relatively large for amore » planet of its age. However, the eccentricity of b in several of our stable solutions reaches >0.1, generating upward of 10{sup 19} W in the interior of the planet via tidal dissipation, possibly inflating the radius to an amount consistent with phase curve observations.« less
Authors:
; ; ; ;  [1] ; ;  [2]
  1. Department of Astronomy, University of Washington, Seattle, WA 98195-1580 (United States)
  2. Department of Astronomy, University of Texas at Austin, Austin, TX 78712 (United States)
Publication Date:
OSTI Identifier:
22364731
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 798; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BRIGHTNESS; COMPUTERIZED SIMULATION; DIAGRAMS; GALAXIES; INCLINATION; MASS; MATHEMATICAL SOLUTIONS; ORBITS; PLANETS; RADIAL VELOCITY; SATELLITES; STARS; THREE-DIMENSIONAL CALCULATIONS; VISIBLE RADIATION