The fate of close-in planets: tidal or magnetic migration?

Abstract

Planets in close-in orbits interact magnetically and tidally with their host stars. These interactions lead to a net torque that makes close-in planets migrate inward or outward depending on their orbital distance. We compare systematically the strength of magnetic and tidal torques for typical observed star-planet systems (T-Tauri & hot Jupiter, M dwarf & Earth-like planet, K star & hot Jupiter) based on state-of-the-art scaling-laws. We find that depending on the characteristics of the system, tidal or magnetic effects can dominate. For very close-in planets, we find that both torques can make a planet migrate on a timescale as small as 10 to 100 thousands of years. Both effects thus have to be taken into account when predicting the evolution of compact systems.

arXiv comment9 pages, 2 figures, 1 table, accepted for publication in The Astrophysical Journal Letters

References in corpus (31)

• The K2 Mission: Characterization and Early results
• Magnetic fields of non-degenerate stars
• ELODIE metallicity-biased search for transiting Hot Jupiters II. A very hot Jupiter transiting the bright K star HD189733
• Stellar magnetism: empirical trends with age and rotation
• Tidal Evolution of Close-in Extra-Solar Planets
• Tidal dissipation in rotating solar-type stars
• The effect of magnetic topology on thermally-driven winds: towards a general formulation of the braking law
• Tides in rotating barotropic fluid bodies: the contribution of inertial waves and the role of internal structure
• Characterizing the Cool Kepler Objects of Interest. New Effective Temperatures, Metallicities, Masses and Radii of Low-Mass Kepler Planet-Candidate Host Stars
• Scaling Laws for Planetary Dynamos
• Magnetic games between a planet and its host star: the key role of topology
• On the diversity of magnetic interactions in close-in star-planet systems
• Effect of the rotation and tidal dissipation history of stars on the evolution of close-in planets
• A hot Jupiter around the very active weak-line T Tauri star TAP 26
• The equilibrium tide in stars and giant planets: I - the coplanar case
• The variation of tidal dissipation in the convective envelope of low-mass stars along their evolution
• Theoretical mass loss rates of cool main-sequence stars
• Optical hydrogen absorption consistent with a thin bow shock leading the hot Jupiter HD 189733b
• Mercury-T: A new code to study tidally evolving multi-planet systems. Applications to Kepler-62
• Tidal dissipation in rotating low-mass stars and implications for the orbital evolution of close-in planets I. From the PMS to the RGB at solar metallicity
• Theory and simulations of rotating convection
• Elliptical instability in hot Jupiter systems
• Age dependence of wind properties for solar type stars: a 3d study
• Assessing magnetic torques and energy fluxes in close-in star-planet systems
• Interaction of Close-in Planets with the Magnetosphere of their Host Stars I: Diffusion, Ohmic Dissipation of Time Dependent Field, Planetary Inflation, and Mass Loss
• Interaction of Close-in Planets with the Magnetosphere of their Host Stars. II. Super-Earths as Unipolar Inductors and their Orbital Evolution
• The impact of rotation on turbulent tidal friction in stellar and planetary convective regions
• Tidal dissipation in rotating low-mass stars and implications for the orbital evolution of close-in massive planets. II. Effect of stellar metallicity
• Tidal inertial waves in the differentially rotating convective envelopes of low-mass stars - I. Free oscillation modes
• Stars Get Dizzy After Lunch
• Protostellar spin-down: a planetary lift?

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• Evolution of star-planet systems under magnetic braking and tidal interaction
• Magnetic and tidal migration of close-in planets. Influence of secular evolution on their population
• HD 156324: a tidally locked magnetic triple spectroscopic binary with a disrupted magnetosphere
• Chasing star-planet magnetic interactions: the case of Kepler-78
• ROOSTER: a machine-learning analysis tool for Kepler stellar rotation periods
• Horizontal shear instabilities in rotating stellar radiation zones: II. Effects of the full Coriolis acceleration
• Testing tidal theory for evolved stars by using red-giant binaries observed by Kepler
• Planetary tidal interactions and the rotational evolution of low-mass stars. The Pleiades' anomaly
• $\epsilon$ Lupi: measuring the heartbeat of a doubly-magnetic massive binary with BRITE-Constellation
• Modeling star-planet interactions in far-out planetary and exoplanetary systems
• Tidal migration of hot Jupiters: introducing the impact of gravity wave dissipation
• Survivability of radio-loud planetary cores orbiting white dwarfs
• Star-planet tidal interaction and the limits of gyrochronology
• Stellar spectral-type (mass) dependence of the dearth of close-in planets around fast-rotating stars. Architecture of Kepler confirmed single-exoplanet systems compared to star-planet evolution models
• Unraveling the evolution of hot Jupiter systems under the effect of tidal and magnetic interactions and mass loss
• Planets Across Space and Time (PAST). VI. Age Dependence of the Occurrence and Architecture of Ultra-Short-Period Planet Systems
• TATOO: a tidal-chronology standalone tool to estimate the age of massive close-in planetary systems
• Magnetic interactions in orbital dynamics
• The discovery of three hot Jupiters, NGTS-23b, 24b and 25b, and updated parameters for HATS-54b from the Next Generation Transit Survey
• Three young planets around the K-dwarf K2-198: High-energy environment, evaporation history and expected future
• Secular dipole-dipole stability of magnetic binaries
• Tidal star-planet interaction and its observed impact on stellar activity in planet-hosting wide binary systems
• Chandra X-ray Observations of V830 Tau: A T Tauri Star Hosting an Evanescent Planet
• Could star-planet magnetic interactions lead to planet migration and influence stellar rotation ?
• Exoplanet host-star properties: the active environment of exoplanets
• Observational imprints of tidal internal gravity wave dissipation in star-planet systems