The Destruction Of Inner Planetary Systems During High-Eccentricity Migration Of Gas Giants

Summary, in English

mass close-in planets, despite the latter being exceedingly common. Two migration channels for hot Jupiters have been proposed: through a protoplanetary gas disk or by tidal circularization of highly eccentric planets. We show that highly eccentric giant planets that will become hot Jupiters clear out any low-mass inner planets in the system, explaining the observed lack of such companions to hot Jupiters. A less common outcome of the interaction is that the giant planet is ejected by the inner planets. Furthermore, the interaction can implant giant planets on moderately high eccentricities at semimajor axes <1 AU, a region otherwise hard to populate. Our work supports the hypothesis that most hot Jupiters reached their current orbits following a phase of high eccentricity, possibly excited by other planetary or stellar companions.

• Author: Alexander Mustill; Melvyn B Davies; Anders Johansen
• Department/s: Lund Observatory
• Publishing year: 2015
• Language: English
• Publication/Series: Astrophysical Journal
• Volume: 808
• Issue: 1
• Links: https://arxiv.org/abs/1502.06971; http://dx.doi.org/10.1088/0004-637X/808/1/14
• Document type: Journal article
• Publisher: American Astronomical Society
• Topic: Astronomy, Astrophysics and Cosmology
• Keywords: stars:; planets and satellites: dynamical evolution and stability; individual (Kepler-18; Kepler-23; Kepler-58; Kepler-339)
• Status: Published
• Project: From pebbles to planets: towards new horizons in the formation of planets; Wallenberg Academy Fellow Project
• ISBN/ISSN/Other: ISSN: 0004-637X