Global Hydromagnetic Simulations of Protoplanetary Disks with Stellar Irradiation and Simplified Thermochemistry
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Global Hydromagnetic Simulations of Protoplanetary Disks with Stellar Irradiation and Simplified Thermochemistry. / Gressel, Oliver; Ramsey, Jon P.; Brinch, Christian; Nelson, Richard P.; Turner, Neal J.; Bruderer, Simon.
I: Astrophysical Journal, Bind 896, Nr. 2, 126, 01.06.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Global Hydromagnetic Simulations of Protoplanetary Disks with Stellar Irradiation and Simplified Thermochemistry
AU - Gressel, Oliver
AU - Ramsey, Jon P.
AU - Brinch, Christian
AU - Nelson, Richard P.
AU - Turner, Neal J.
AU - Bruderer, Simon
PY - 2020/6/1
Y1 - 2020/6/1
N2 - Outflows driven by large-scale magnetic fields likely play an important role in the evolution and dispersal of protoplanetary disks and in setting the conditions for planet formation. We extend our 2D-axisymmetric nonideal MHD model of these outflows by incorporating radiative transfer and simplified thermochemistry, with the dual aims of exploring how heating influences wind launching and illustrating how such models can be tested through observations of diagnostic spectral lines. Our model disks launch magnetocentrifugal outflows primarily through magnetic tension forces, so the mass-loss rate increases only moderately when thermochemical effects are switched on. For typical field strengths, thermochemical and irradiation heating are more important than magnetic dissipation. We furthermore find that the entrained vertical magnetic flux diffuses out of the disk on secular timescales as a result of nonideal MHD. Through postprocessing line radiative transfer, we demonstrate that spectral line intensities and moment-1 maps of atomic oxygen, the HCN molecule, and other species show potentially observable differences between a model with a magnetically driven outflow and one with a weaker, photoevaporative outflow. In particular, the line shapes and velocity asymmetries in the moment-1 maps could enable the identification of outflows emanating from the disk surface.
AB - Outflows driven by large-scale magnetic fields likely play an important role in the evolution and dispersal of protoplanetary disks and in setting the conditions for planet formation. We extend our 2D-axisymmetric nonideal MHD model of these outflows by incorporating radiative transfer and simplified thermochemistry, with the dual aims of exploring how heating influences wind launching and illustrating how such models can be tested through observations of diagnostic spectral lines. Our model disks launch magnetocentrifugal outflows primarily through magnetic tension forces, so the mass-loss rate increases only moderately when thermochemical effects are switched on. For typical field strengths, thermochemical and irradiation heating are more important than magnetic dissipation. We furthermore find that the entrained vertical magnetic flux diffuses out of the disk on secular timescales as a result of nonideal MHD. Through postprocessing line radiative transfer, we demonstrate that spectral line intensities and moment-1 maps of atomic oxygen, the HCN molecule, and other species show potentially observable differences between a model with a magnetically driven outflow and one with a weaker, photoevaporative outflow. In particular, the line shapes and velocity asymmetries in the moment-1 maps could enable the identification of outflows emanating from the disk surface.
KW - Magnetohydrodynamics
KW - Radiative transfer simulations
KW - Stellar accretion disks
KW - Astrochemistry
KW - Protoplanetary disks
KW - VERTICAL SHEAR INSTABILITY
KW - WEAKLY MAGNETIZED DISKS
KW - MASS PLANET MIGRATION
KW - TORQUED DEAD ZONES
KW - ACCRETION DISKS
KW - PHOTODISSOCIATION REGIONS
KW - CONSTRAINED TRANSPORT
KW - MHD SIMULATIONS
KW - MAGNETOROTATIONAL INSTABILITY
KW - MAGNETOHYDRODYNAMICS CODE
U2 - 10.3847/1538-4357/ab91b7
DO - 10.3847/1538-4357/ab91b7
M3 - Journal article
VL - 896
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 126
ER -
ID: 247028315