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Название: Thermal evolution of protoplanetary disks: From β -cooling to decoupled gas and dust temperatures
Авторы: Vorobyov, E. I.
Matsukoba, R.
Omukai, K.
Guedel, M.
Дата публикации: 2020
Издатель: EDP Sciences
Библиографическое описание: Thermal evolution of protoplanetary disks: From β -cooling to decoupled gas and dust temperatures / E. I. Vorobyov, R. Matsukoba, K. Omukai, M. Guedel. — DOI 10.1051/0004-6361/202037841 // Astronomy and Astrophysics. — 2020. — Iss. 638. — 202037841.
Аннотация: Aims. We explore the long-term evolution of young protoplanetary disks with different approaches to computing the thermal structure determined by various cooling and heating processes in the disk and its surroundings. Methods. Numerical hydrodynamics simulations in the thin-disk limit were complemented with three thermal evolution schemes: a simplified β-cooling approach with and without irradiation, where the rate of disk cooling is proportional to the local dynamical time; a fiducial model with equal dust and gas temperatures calculated taking viscous heating, irradiation, and radiative cooling into account; and a more sophisticated approach allowing decoupled dust and gas temperatures. Results. We found that the gas temperature may significantly exceed that of dust in the outer regions of young disks thanks to additional compressional heating caused by the infalling envelope material in the early stages of disk evolution and slow collisional exchange of energy between gas and dust in low-density disk regions. However, the outer envelope shows an inverse trend, with the gas temperatures dropping below that of dust. The global disk evolution is only weakly sensitive to temperature decoupling. Nevertheless, separate dust and gas temperatures may affect the chemical composition, dust evolution, and disk mass estimates. Constant-β models without stellar and background irradiation fail to reproduce the disk evolution with more sophisticated thermal schemes because of the intrinsically variable nature of the β-parameter. Constant-β models with irradiation more closely match the dynamical and thermal evolution, but the agreement is still incomplete. Conclusions. Models allowing separate dust and gas temperatures are needed when emphasis is placed on the chemical or dust evolution in protoplanetary disks, particularly in subsolar metallicity environments. © ESO 2020.
Ключевые слова: HYDRODYNAMICS
PROTOPLANETARY DISKS
STARS: PROTOSTARS
GASES
IRRADIATION
LONG TERM EVOLUTION (LTE)
RADIATIVE COOLING
CHEMICAL COMPOSITIONS
COMPRESSIONAL HEATING
DUST TEMPERATURES
EXCHANGE OF ENERGY
NUMERICAL HYDRODYNAMICS
PROTOPLANETARY DISKS
SUB-SOLAR METALLICITY
THERMAL EVOLUTION
DUST
URI: http://elar.urfu.ru/handle/10995/90218
Условия доступа: info:eu-repo/semantics/openAccess
Идентификатор SCOPUS: 85087839755
Идентификатор WOS: 000545013500001
Идентификатор PURE: 13390941
ISSN: 0004-6361
DOI: 10.1051/0004-6361/202037841
Сведения о поддержке: Austrian Science Fund, FWF: P31635-N27
Austrian Science Fund, FWF
17H06360, 17H02869
Acknowledgements. We are thankful to the anonymous referee for constructive comments that helped to improve the manuscript. E.I.V. and M.G. acknowledge support from the Austrian Science Fund (FWF) under research grant P31635-N27. K.O and R.M acknowledge support work by MEXT/JSPS KAKENHI Grant Number17H01102, 17H02869, 17H06360. The simulations were performed on the Vienna Scientific Cluster.
Располагается в коллекциях:Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC

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