Thesis

Modelling accretion and outflow regions around Young Stellar Objects

• Call:

  IDPASC Portugal - PHD Programme 2015

• Academic Year:

  2015 / 2016

• Domain:

  Astrophysics

• Supervisor:

  Jorge Gameiro

• Co-Supervisor:

  Christophe Sauty

• Institution:

  Universidade do Porto

• Host Institution:

  Centro de Astrofísica da Universidade do Porto

• Abstract:

  The evolution of young stellar objects (YSO’s) depends on the balance between the accretion of matter coming from their surrounding disks and the jets outflowing around their poles. The magnetic field plays a crucial role in both channelling these flows of plasma and controlling their dynamics and energetics. T Tauri stars (class II) are well observed objects. In such evolved protostars, observational evidences suggest that jets originate in the inner regions of the accretion disk or even closer in the magnetosphere of the central source. Thus it is crucial to understand the connection between these two regions, one controlling accretion and the other responsible for the jet. In this project we aim at modelling the structure of the magnetosphere of the YSO in which accretion takes place using existing numerical codes like PLUTO. This approach will enable a blending between accretion and outflow regions around YSO’s. The advantage of such numerical approach is to enable the study of time dependent solutions. Afterwards, the solutions found will be used in a separate radiative transfer model to compute line profiles and test the consistency of the MHD solutions with observations.