Halting Migration in Magnetospherically Sculpted Protoplanetary Disks

Abstract

We present a physically motivated model for the manner in which a stellar magnetic field sculpts the inner edge of a protoplanetary disk, and examine the consequence for the migration and stopping of sub-Neptune and super-Earth planets. This model incorporates a transition zone exterior to the inner truncation of the disk, where the surface density profile is modified by the diffusion of the stellar magnetic field into the disk. This modification results in a migration trap at the outer edge of the transition zone. We performed simulations of single planet migration, considering a range of stellar magnetic field strengths and magnetic diffusion profiles. Our simulations show a tight relationship between the final locations of planets and the total magnetic budget available for the disk from their host star. We found that a stellar magnetic field between 67 to 180G and a power-law index between 3 and 2.75 can reasonably reproduce the location at which the observed occurrence rate of close-in Super-Earth and Sub-Neptune populations changes slope.

arXiv commentPaper was submitted to MNRAS. Authors had received the first referee report requesting minor revision before reconsideration for publication

References in corpus (45)

• Planet Occurrence within 0.25 AU of Solar-type Stars from Kepler
• Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data
• Prevalence of Earth-size planets orbiting Sun-like stars
• A super-Earth transiting a nearby low-mass star
• Planet-disk interaction and orbital evolution
• The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters
• Transiting exoplanets from the CoRoT space mission VIII. CoRoT-7b: the first Super-Earth with measured radius
• Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing
• Growth Model Interpretation of Planet Size Distribution
• A torque formula for non-isothermal Type I planetary migration - II. Effects of diffusion
• A ~ 7.5 Earth-Mass Planet Orbiting the Nearby Star, GJ 876
• The Minimum-Mass Extrasolar Nebula: In-Situ Formation of Close-In Super-Earths
• Breaking the Chains: Hot Super-Earth systems from migration and disruption of compact resonant chains
• Migration and the formation of systems of hot super-Earths and Neptunes
• Models of the in situ formation of detected extrasolar giant planets
• The California-Kepler Survey. IV. Metal-rich Stars Host a Greater Diversity of Planets
• Dearth of short-period Neptunian exoplanets - a desert in period-mass and period-radius planes
• Evolution of protoplanetary disks: Constraints from DM Tauri and GM Aurigae
• Migration then assembly: Formation of Neptune mass planets inside 1 AU
• In Situ Formation and Dynamical Evolution of Hot Jupiter Systems
• Testing In Situ Assembly with the Kepler Planet Candidate Sample
• Inside-Out Planet Formation
• Dust dynamics during protoplanetary disc clearing
• The Exoplanet Census: A General Method, Applied to Kepler
• The New Generation Planetary Population Synthesis (NGPPS). I. Bern global model of planet formation and evolution, model tests, and emerging planetary systems
• A Planet Orbiting the Star Rho Coronae Borealis
• Protoplanetary Disk Winds by Magnetorotational Instability : Formation of an Inner Hole and a Crucial Assist for Planet Formation
• Accretion disc dynamo activity in local simulations spanning weak-to-strong net vertical magnetic flux regimes
• Magnetospheric Truncation, Tidal Inspiral, and the Creation of Short and Ultra-Short Period Planets
• The In Situ Formation of Giant Planets at Short Orbital Periods
• Classical T Tauri stars: magnetic fields, coronae, and star-disc interactions
• The Origin of Planetary System Architectures. I. Multiple Planet Traps in Gaseous Discs
• Dynamical rearrangement of super-Earths during disk dispersal I. Outline of the magnetospheric rebound model
• Global models of planetary system formation in radiatively-inefficient protoplanetary discs
• Magnetospheric Gap and Accumulation of Giant Planets Close to the Star
• Halting Planet Migration in the Evacuated Centers of Protoplanetary Disks
• Migration of Extrasolar Planets: Effects from X-Wind Accretion Disks
• EXor outbursts from disk amplification of stellar magnetic cycles
• Trapping low-mass planets at the inner edge of the protostellar disc
• Protoplanet Magnetosphere Interactions
• Tidal and Magnetic Interactions between a Hot Jupiter and its Host Star in the Magnetospheric Cavity of a Protoplanetary Disk
• Analytic Expressions for the Inner-Rim Structure of Passively Heated Protoplanetary Disks
• Protoplanetary Disk Resonances and Type I Migration
• Trapping of Low-Mass Planets Outside the Truncated Inner Edges of Protoplanetary Discs
• The circulation of dust in protoplanetary discs and the initial conditions of planet formation

Cited by in corpus (1)

• Predicting the Dominant Formation Mechanism of Multi-Planetary Systems