Secular Transport during Disk Dispersal: The Case of Kepler-419

Cristobal Petrovich, Yanqin Wu, Mohamad Ali-Dib

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Due to fortuitous circumstances, the two giant planets around Kepler-419 have well characterized three-dimensional orbits. They are nearly coplanar to each other; the inner one has a large eccentricity (≃0.82); and the apses of the two orbits librate around anti-alignment. Such a state defies available proposals for large eccentricities. We argue that it is instead uniquely produced by a decaying protoplanetary disk. When the disk was massive, its precessional effect on the planets forced the two apses to center around an anti-aligned state. And as the disk is gradually eroded, the pair of planets are adiabatically transported to a new state where most of the eccentricity (or rather, the angular momentum deficit) is transferred to the inner planet, and the two apses are largely anti-aligned. During this transport, any initial mutual inclination may be reduced or enhanced; either may be compatible with the current constraints. So a primordial disk can drive up planet eccentricities both in resonant planet pairs (as has been shown for GJ 876) and in secularly-interacting, non-resonant pairs. The mechanism discussed here may be relevant for forming hot Jupiters and for explaining the observed eccentricities of warm and cold giant planets.

    Original languageEnglish (US)
    Article number5
    JournalAstronomical Journal
    Volume157
    Issue number1
    DOIs
    StatePublished - Jan 2019

    Keywords

    • planetdisk interactions
    • planets and satellites: dynamical evolution and stability

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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