Anatomy of Photoevaporation Base: Linking the Property of the Launched Wind to Irradiation Flux

Ultraviolet and X-rays from radiation sources disperse nearby gas clumps by driving winds due to heating associated with the photochemical processes. This dispersal process, photoevaporation, constrains the lifetimes of the parental bodies of stars and planets. To understand this process in a univer...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 930; no. 2; pp. 124 - 137
Main Authors Nakatani, Riouhei, Takasao, Shinsuke
Format Journal Article
LanguageEnglish
Published Philadelphia The American Astronomical Society 01.05.2022
IOP Publishing
Subjects
Astrophysical fluid dynamics
Astrophysics
Boundary conditions
Clumps
Density
Dispersion
H II regions
Hydrodynamical simulations
Hydrodynamics
Interdisciplinary astronomy
Interstellar medium wind
Irradiation
Launching bases
Mathematical analysis
Mathematical models
Modelling
Photochemicals
Planet formation
Protoplanetary disks
Radiation
Radiation flux
Radiation sources
Ultraviolet radiation
Wind
X-rays
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Summary:Ultraviolet and X-rays from radiation sources disperse nearby gas clumps by driving winds due to heating associated with the photochemical processes. This dispersal process, photoevaporation, constrains the lifetimes of the parental bodies of stars and planets. To understand this process in a universal picture, we develop an analytical model that describes the fundamental physics in the vicinity of the wind-launching region. The model explicitly links the density and velocity of photoevaporative winds at the launch points to the radiation flux reaching the wind-launching base, using a jump condition. The model gives a natural boundary condition for the wind-emanating points. We compare the analytical model with the results of radiation hydrodynamic simulations, where a protoplanetary disk is irradiated by the stellar extreme-ultraviolet, and confirm good agreement of the base density and velocity, and radial profiles of mass-loss rates. We expect that our analytical model is applicable to other objects subject to photoevaporation not only by extreme-ultraviolet but by far-ultraviolet/X-rays with suitable modifications. Future self-consistent numerical studies can test the applicability.
Bibliography:AAS33473
Interstellar Matter and the Local Universe
ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac63a0