Time-dependent evolution of the protoplanetary discs with magnetic winds
2019
We study the
evolutionof the protoplanetary
discs(PPDs) in the presence of magnetically driven winds with the stress relations motivated by the non-ideal MHD
discsimulations. Contribution of the magnetic winds in the angular momentum removal and mass loss are described using these relations which are quantified in terms of the
plasma parameter.
Evolutionof the essential
discquantities including the surface density, accretion rate and wind mass loss rate are studied for a wide range of the model parameters. Two distinct phases of the
disc
evolutionare found irrespective of the adopted input parameters. While at the early phase of the
disc
evolution, global
discquantities such as its total mass and magnetic flux undergo non-significant reductions, their rapid declines are found in the second phase of
evolution. Duration of each phase, however, depends upon the model parameters including magnetic wind strength. Our model predicts that contributions of the magnetic winds in the
disc
evolutionare significant during the second phase. We then calculated locus of points in the plane of the accretion rate and total
discmass corresponding to an ensemble of evolving PPDs. Our theoretical isochrone tracks exhibit reasonable fits to the observed PPDs in star forming regions Lupus and $\sigma$-Orion.
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