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Planet-Planet Scattering and ZLK Migration -- The Dynamical History of HAT-P-11

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arxiv 2405.19511 v2 pith:5IFIEDIR submitted 2024-05-29 astro-ph.EP

Tiger Lu , Qier An , Gongjie Li , Sarah C. Millholland , Malena Rice , G. Mirek Brandt , Timothy D. Brandt This is my paper · ORCID
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keywords hat-p-11systemdynamicalmigrationsignificantconsistenteccentricitiesorbit
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The two planets of the HAT-P-11 system represent fascinating dynamical puzzles due to their significant eccentricities and orbital misalignments. In particular, HAT-P-11 b is on a close-in orbit that tides should have circularized well within the age of the system. Here we propose a two-step dynamical process that can reproduce all intriguing aspects of the system. We first invoke planet-planet scattering to generate significant eccentricities and mutual inclinations between the planets. We then propose that this misalignment initiated von-Zeipel-Lidov-Kozai cycles and high-eccentricity migration that ultimately brought HAT-P-11 b to its present-day orbit. We find that this scenario is fully consistent only when significant tidally-driven radius inflation is accounted for during the tidal migration. We present a suite of N-body simulations exploring each phase of evolution and show that this scenario is consistent with all observational posteriors and the reported age of the system.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Warm Sub-Saturns Orbiting Single Stars Are Spin-Orbit Aligned

    astro-ph.EP 2026-07 conditional novelty 6.0 of 10

    Warm sub-Saturns around single cool stars are predominantly aligned whereas hot sub-Saturns are frequently misaligned (3.2σ), a separation-dependent transition the authors attribute to high-eccentricity migration.

  2. Properties of Free Floating Planets Ejected through Planet-Planet Scattering

    astro-ph.EP 2025-01 conditional novelty 6.0 of 10

    Simulations of planet-planet scattering show 40-80% of planets are ejected over a billion years with excess speeds of 2-6 km/s, implying 5-10 formed planets per star to match observed free-floating planets.

  3. Refined parameters, formation, and dynamical stability of the wild exoplanet system K2-312=HD 80653

    astro-ph.EP 2026-07 conditional novelty 5.0 of 10

    HD 80653c is confirmed as a highly eccentric cold Jupiter (P=871.3 d, e=0.8435, M sin i=5.3 MJup) whose orbit and survival of the inner super-Earth are consistent with planet-planet scattering.

  4. Understanding eccentric temperate giants: an in-depth study of the architecture and stellar obliquity of the TOI-2134 system

    astro-ph.EP 2026-07 unverdicted novelty 5.0 of 10

    Updated analysis of TOI-2134 with new TESS sectors and spectra confirms an inner mini-Neptune and outer eccentric sub-Saturn, measures their masses and radii, and reports a 59 degree obliquity for the outer planet via...

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