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Verfasst von:Rodenkirch, Peter [VerfasserIn]   i
 Klahr, Hubertus [VerfasserIn]   i
 Fendt, Christian [VerfasserIn]   i
 Dullemond, Cornelis [VerfasserIn]   i
Titel:Global axisymmetric simulations of photoevaporation and magnetically driven protoplanetary disk winds
Verf.angabe:P.J. Rodenkirch, H. Klahr, C. Fendt, and C.P. Dullemond
Jahr:2020
Umfang:15 S.
Fussnoten:Published online 24 December 2019 ; Gesehen am 24.02.2020
Titel Quelle:Enthalten in: Astronomy and astrophysics
Ort Quelle:Les Ulis : EDP Sciences, 1969
Jahr Quelle:2020
Band/Heft Quelle:633(2020) Artikel-Nummer A21, 15 Seiten
ISSN Quelle:1432-0746
Abstract:Context. Photoevaporation and magnetically driven winds are two independent mechanisms that remove mass from protoplanetary disks. In addition to accretion, the effect of these two principles acting concurrently could be significant, and the transition between them has not yet been extensively studied and quantified. Aims. In order to contribute to the understanding of disk winds, we present the phenomena emerging in the framework of two-dimensional axisymmetric, nonideal magnetohydrodynamic simulations including extreme-ultraviolet (EUV) and X-ray driven photoevaporation. Of particular interest are the examination of the transition region between photoevaporation and magnetically driven wind, the possibility of emerging magnetocentrifugal wind effects, and the morphology of the wind itself, which depends on the strength of the magnetic field. Methods.<i/> We used the PLUTO code in a two-dimensional axisymmetric configuration with additional treatment of EUV and X-ray heating and dynamic ohmic diffusion based on a semi-analytical chemical model. Results. We determine that the transition between the two outflow types occurs for values of the initial plasma beta <i>β<i/> ≥ 10<sup>7<sup/>, while magnetically driven winds generally outperform photoevaporation for stronger fields. In our simulations we observe irregular and asymmetric outflows for stronger magnetic fields. In the weak-field regime, the photoevaporation rates are slightly lowered by perturbations of the gas density in the inner regions of the disk. Overall, our results predict a wind with a lever arm smaller than 1.5, consistent with a hot magnetothermal wind. Stronger accretion flows are present for values of <i>β<i/> < 10<sup>7<sup/>.
DOI:doi:10.1051/0004-6361/201834945
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1051/0004-6361/201834945
 Verlag: https://www.aanda.org/articles/aa/abs/2020/01/aa34945-18/aa34945-18.html
 DOI: https://doi.org/10.1051/0004-6361/201834945
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1690846747
Verknüpfungen:→ Zeitschrift

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