How do External Companions Affect Spin-Orbit Misalignment of Hot Jupiters?

Abstract

Consider a planet with its orbital angular momentum axis aligned with the spin axis of its host star. To what extent does an inclined distant companion (giant planet or binary star) affect this alignment? We provide an analytic, quantitative answer and apply it to hot Jupiter systems, for which misalignments between the orbital axis and the stellar spin axis have been detected. We also show how similar consideration can be applied to multi-planet systems with distant companions (such as Kepler-56). The result of this paper provides a simple method to assess the dynamical role played by external companions on spin-orbit misalignments in exoplanetary systems.

arXiv comment6 pages, 5 figures, submitted to MNRAS

References in corpus (38)

• Shrinking binary and planetary orbits by Kozai cycles with tidal friction
• The Occurrence and Architecture of Exoplanetary Systems
• Formation of Hot Planets by a combination of planet scattering, tidal circularization, and Kozai mechanism
• Secular Chaos and the Production of Hot Jupiters
• Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets
• Chaotic star formation and the alignment of stellar rotation with disc and planetary orbital axes
• Stellar Spin-Orbit Misalignment in a Multiplanet System
• On the Formation of Hot Jupiters in Stellar Binaries
• WASP-47: A Hot Jupiter System with Two Additional Planets Discovered by K2
• Multiple-Planet Scattering and the Origin of Hot Jupiters
• Suppression of extreme orbital evolution in triple systems with short range forces
• Evolution of Spin Direction of Accreting Magnetic Protostars and Spin-Orbit Misalignment in Exoplanetary Systems
• Hot Jupiters in binary star systems
• Steady-state planet migration by the Kozai-Lidov mechanism in stellar binaries
• Statistics of Long Period Gas Giant Planets in Known Planetary Systems
• Formation and Stellar Spin-Orbit Misalignment of Hot Jupiters from Lidov-Kozai Oscillations in Stellar Binaries
• Seven transiting hot-Jupiters from WASP-South, Euler and TRAPPIST: WASP-47b, WASP-55b, WASP-61b, WASP-62b, WASP-63b, WASP-66b & WASP-67b
• Friends of Hot Jupiters II: No Correspondence Between Hot-Jupiter Spin-Orbit Misalignment and the Incidence of Directly Imaged Stellar Companions
• Star-Disc-Binary Interactions in Protoplanetary Disc Systems and Primordial Spin-Orbit Misalignments
• Friends of Hot Jupiters. IV. Stellar companions beyond 50 AU might facilitate giant planet formation, but most are unlikely to cause Kozai-Lidov migration
• HAT-P-13b,c: a transiting hot Jupiter with a massive outer companion on an eccentric orbit
• Magnetic and Gravitational Disk-Star Interactions: An Interdependence of PMS Stellar Rotation Rates and Spin-Orbit Misalignments
• The HAT-P-13 Exoplanetary System: Evidence for Spin-Orbit Alignment and a Third Companion
• Chaotic Dynamics of Stellar Spin in Binaries and the Production of Misaligned Hot Jupiters
• New values of gravitational moments J2 and J4 deduced from helioseismology
• Early Excitation of Spin-Orbit Misalignments in Close-in Planetary Systems
• Hot Jupiters with relatives: discovery of additional planets in orbit around WASP-41 and WASP-47
• Hiding Planets Behind a Big Friend: Mutual Inclinations of Multi-Planet Systems with External Companions
• The formation efficiency of close-in planets via Lidov-Kozai migration: analytic calculations
• WASP-22 b: A transiting "hot Jupiter" planet in a hierarchical triple system
• The Orbit and Mass of the Third Planet in the Kepler-56 System
• The Dynamics of the Multi-planet System Orbiting Kepler-56
• Compact planetary systems perturbed by an inclined companion: I. Vectorial representation of the secular model
• A low stellar obliquity for WASP-47, a compact multiplanet system with a hot Jupiter and an ultra-short period planet
• Dynamical constraints on the origin of hot and warm Jupiters with close friends
• Spin-orbit measurements and refined parameters for the exoplanet systems WASP-22 and WASP-26
• Solar Obliquity Induced by Planet Nine: Simple Calculation
• Exterior Companions to Hot Jupiters Orbiting Cool Stars are Coplanar

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• Black Hole and Neutron Star Binary Mergers in Triple Systems: Merger Fraction and Spin-Orbit Misalignment
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• Evidence for a high mutual inclination between the cold Jupiter and transiting super Earth orbiting $\pi$ Men
• Low-Eccentricity Migration of Ultra-Short Period Planets in Multi-Planet Systems
• A backward-spinning star with two coplanar planets
• Rotation Periods, Inclinations, and Obliquities of Cool Stars Hosting Directly Imaged Substellar Companions: Spin-Orbit Misalignments are Common
• The Aligned Orbit of WASP-148b, the Only Known Hot Jupiter with a Nearby Warm Jupiter Companion, from NEID and HIRES
• The misaligned orbit of the Earth-sized planet Kepler-408b
• Strong Scatterings of Cold Jupiters and their Influence on Inner Low-mass Planet Systems: Theory and Simulations
• Teetering Stars: Resonant Excitation of Stellar Obliquities by Hot and Warm Jupiters with External Companions
• Kepler-1656b's Extreme Eccentricity: Signature of a Gentle Giant
• Observable Predictions from Perturber-coupled High-eccentricity Tidal Migration of Warm Jupiters
• Confirmation and characterisation of three giant planets detected by TESS from the FIES/NOT and Tull/McDonald spectrographs
• Radial velocity confirmation of a hot super-Neptune discovered by TESS with a warm Saturn-mass companion
• Hiding Planets Near and Far: The Parameter Space of Hidden Companions for Known Planetary Systems
• Evolution of the Planetary Obliquity: The Eccentric Kozai-Lidov Mechanism Coupled with Tide
• Excitation of Spin-Orbit Misalignments in Stellar Binaries with Circumbinary Disks: Application to DI Herculis
• Stellar Obliquity Excitation via Disk Dispersal-Driven Resonances in Binaries
• Generating Stellar Obliquity in Systems with Broken Protoplanetary Disks