Gravitational fragmentation and formation of giant protoplanets on tens-of-au orbits

Abstract

Migration of dense gaseous clumps that form in young protostellar disks via gravitational fragmentation is investigated to determine the likelihood of giant planet formation. High-resolution numerical hydrodynamics simulations in the thin-disk limit are employed to compute the formation and long-term evolution of a gravitationally unstable protostellar disk around a solar-mass star. We show that gaseous clumps that form in the outer regions of the disk (>100 AU) through disk fragmentation are often perturbed by other clumps or disk structures, such as spiral arms, and migrate toward the central star on timescales from a few 10^3 to few 10^4 yr. The migration timescale is slowest when stellar motion in response to the disk gravity is considered. When approaching the star, the clumps first gain mass (up to several tens of M_Jup), but then quickly lose most of their diffuse envelopes through tidal torques. Part of the clump envelope can be accreted on the central star causing an FU-Ori-type accretion and luminosity outburst. The tidal mass loss helps the clumps to significantly slow down or even halt their inward migration at a distance of a few tens of AU from the protostar. The resulting clumps are heavily truncated both in mass and size compared to their wider-orbit counterparts, keeping only a dense and hot nucleus. During the inward migration, the temperature in the clump interiors may exceed the molecular hydrogen dissociation limit (2000 K) and the central region of the clump can collapse into a gas giant protoplanet. We argue that FU-Orionis-type luminosity outbursts may be the end product of disk fragmentation and clump inward migration, ushering the formation of giant protoplanets on tens-of-au orbits in systems such as HR~8799.

arXiv comment16 pages, 16 figures, accepted for publication in Astronomy & Astrophysics

References in corpus (46)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Nonlinear Outcome of Gravitational Instability in Cooling, Gaseous Disks
• Optical Images of an Exosolar Planet 25 Light Years from Earth
• Rosseland and Planck Mean Opacities for Protoplanetary Discs
• Can giant planets form by direct gravitational instability?
• Modeling Collapse and Accretion in Turbulent Gas Clouds: Implementation and Comparison of Sink Particles in AMR and SPH
• The properties of brown dwarfs and low-mass hydrogen-burning stars formed by disc fragmentation
• The burst mode of accretion and disk fragmentation in the early embedded stages of star formation
• The Origin of Episodic Accretion Bursts in the Early Stages of Star Formation
• The effect of cooling on the global stability of self-gravitating protoplanetary discs
• The Two Modes of Gas Giant Planet Formation
• Clumps in the Outer Disk by Disk Instability: Why They are Initially Gas Giants and the Legacy of Disruption
• Non-steady Accretion in Protostars
• Challenges in Forming Planets by Gravitational Instability: Disk Irradiation and Clump Migration, Accretion & Tidal Destructio
• Variable protostellar accretion with episodic bursts
• Nonlinear Outcome of Gravitational Instability in Disks with Realistic Cooling
• Formation of planets by tidal downsizing of giant planet embryos
• Fragmentation of gravitationally unstable gaseous protoplanetary disks with radiative transfer
• Rapid inward migration of planets formed by gravitational instability
• The Directly Imaged Planet around the Young Solar Analog 1RXS J160929.1-210524: Confirmation of Common Proper Motion, Temperature and Mass
• Observed luminosity spread in young clusters and Fu Ori stars: a unified picture
• Recurrent Planet Formation and Intermittent Protostellar Outflows Induced by Episodic Mass Accretion
• On the Reliability of Stellar Ages and Age Spreads Inferred from Pre-Main Sequence Evolutionary Models
• On the existence of accretion-driven bursts in massive star formation
• Formation of giant planets and brown dwarfs on wide orbits
• Grain sedimentation inside giant planet embryos
• Decoupling of Magnetic Fields in Collapsing Protostellar Envelopes and Disk Formation and Fragmentation
• A Hybrid Scenario for the Formation of Brown Dwarfs and Very Low Mass Stars
• Fu Ori outbursts and the planet-disc mass exchange
• A numerical simulation of a "super-Earth" core delivery from ~ 100 AU to ~ 8 AU
• Signatures of Gravitational Instability in Resolved Images of Protostellar Disks
• A revised condition for self-gravitational fragmentation of protoplanetary disks
• Dawes Review. The tidal downsizing hypothesis of planet formation
• The collapse of protoplanetary clumps formed through disc instability: 3D simulations of the pre-dissociation phase
• The chemistry of episodic accretion in embedded objects. 2D radiation thermo-chemical models of the post-burst phase
• The migration of gas giant planets in gravitationally unstable discs
• The effect of episodic accretion on the phase transition of CO and CO_2 in low-mass star formation
• The Burst Mode of Accretion in Primordial Protostars
• Triggered fragmentation in self-gravitating discs: forming fragments at small radii
• Ejection of gaseous clumps from gravitationally unstable protostellar disks
• The effect of accretion on the pre-main-sequence evolution of low-mass stars and brown dwarfs
• The circumstellar disk response to the motion of the host star
• Vortex stretching in self-gravitating protoplanetary discs
• The diverse lives of massive protoplanets in self-gravitating discs
• FU Orionis outbursts, preferential recondensation of water ice, and the formation of giant planets
• The Near-Infrared Outflow and Cavity of the proto-Brown Dwarf Candidate ISO-Oph 200

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