Gap opening beyond dead zones by photoevaporation

Abstract

We propose a new hypothesis for the origin of protoplanetary discs with large inner holes (or gaps), so-called transition discs. Our gas disc model takes into account layered accretion, in which poorly-ionized low-viscosity dead zones are sandwiched by high-viscosity surface layers, and photoevaporative winds induced by X-rays from the central stars. We find that a gap opens at a radius outside a dead zone, if the mass loss rate due to photoevaporative winds exceeds the mass accretion rate in the dead zone region. Since the dead zone survives even after the gap opens, mass accretion onto the central star continues for a long time. This model can reproduce large gap sizes and high mass accretion rates seen in observed transition discs.

8 pages, 6 figures, Accepted for publication in MNRAS

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Cited by in corpus (18)

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• Planetary Populations in the Mass-Period Diagram: A Statistical Treatment of Exoplanet Formation and the Role of Planet Traps
• The origin and evolution of transition discs: successes, problems and open questions
• Dispersal of protoplanetary disks by the combination of magnetically driven and photoevaporative winds
• Transitional disks and their origins: an infrared spectroscopic survey of Orion A
• Formation of circumbinary planets in a dead zone
• Wind-driven Accretion in Transitional Protostellar Disks
• Accreting planets as dust dams in `transition' discs
• Large gaps and high accretion rates in photoevaporative transition disks with a dead zone
• Accreting Transition Discs with large cavities created by X-ray photoevaporation in C and O depleted discs
• N-body simulations of oligarchic growth of Mars: Implications for Hf-W chronology
• Long-term Evolution of Photoevaporating Protoplanetary Disks
• Magnetised Winds in Transition Discs I: 2.5D Global Simulations
• Millimeter emission in photoevaporating disks is determined by early substructures
• Time-dependent long-term hydrodynamic simulations of the inner protoplanetary disk III: The influence of photoevaporation
• A question of personalities: evolution of viscous and wind-driven protoplanetary discs in the presence of dead zones