Chaotic quadruple secular evolution and the production of misaligned exomoons and Warm Jupiters in stellar multiples

Evgeni Grishin, Dong Lai, Hagai B. Perets

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22 Citations (Scopus)

Abstract

We study the chaotic and secular evolution of hierarchical quadruple systems in the 3 + 1 configuration, focusing on the evolution of mutual inclination of the inner binaries as the system undergoes coupled Lidov-Kozai (LK) oscillations. We include short-range forces (SRF; such as those due to tidal and rotational distortions) that control the eccentricity excitation of the inner binary. The evolution of mutual inclination is described, a priori, by two dimensionless parameters, R0, the ratio between the inner and outer LK time-scales and ∈SRF, the ratio between the SRF precession and the inner LK precession rates. We find that the chaotic zones for the mutual inclination depend mainly on R0, while ∈SRF controls mainly the range of eccentricity excitation. The mutual inclination evolves chaotically for 1 ≲ R0 ≲ 10, leading to large misalignments. For 0.4 ≲ R0 ≲ 0.8, the system could be weakly excited and produce bimodal distribution of mutual inclination angles. Our results can be applied to exomoons- planets in stellar binaries andWarm/Hot Jupiters in stellar triples. Such systems could develop large mutual inclination angles if the inner binary is tight enough, and also high eccentricities, depending on the strength of the SRFs. Future detections of tilted Warm/Hot Jupiters and exomoons could put our mechanism under observational tests.

Original languageEnglish
Pages (from-to)3547-3556
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume474
Issue number3
DOIs
Publication statusPublished - 1 Mar 2018
Externally publishedYes

Keywords

  • Binaries: general
  • Planet-star interactions
  • Planets and satellites: dynamical evolution and stability

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