Wed 1/28: Ian Stephens (BU): The Morphology of the Magnetic Field of HL Tau

in Seminars
January 29th, 2014

The Morphology of the Magnetic Field of HL Tau

Dr. Ian Stephens
Boston University


The formation of disks around protostars is thought to be regulated through magnetic fields, and theoretical models suggest that the fractional polarization should be approximately 2-3%. Nevertheless, resolved observations of disks in T Tauri stars (TTS) have remained undetected and are constrained to have fractional polarization of less than 1%. However, with CARMA observations of HL Tau, we recently found the first detection of a resolved magnetic field about a TTS. These observations hint at a toroidal field, which suggests that accretion of T Tauri stars is controlled by magnetohydrodynamic turbulence driven by magnetorotational instability.

The talk will begin at 12:10 pm in CAS 500.