On the effects of the stellar magnetic field on the structure of T Tauri accretion discs

Details On the effects of the stellar magnetic field on the structure of T Tauri accretion discs On the effects of the stellar magnetic field on the structure of T Tauri accretion discs

2001-12-04

arxiv.org/abs/astro-ph/0112085v1

Astronomy and Astrophysics

Astrophysics

21 pages, 4 figures; accepted for MNRAS (figure 4 is compressed and thus of slightly reduced quality)

Scientific paper

The structure of accretion discs around magnetic T Tauri stars is numerically calculated using a particle hydrodynamical code, in which magnetic interaction is included in the framework of King's diamagnetic blob accretion model. Setting up the calculation so as to simulate the density structure of a quasi-steady disc in the equatorial plane of a T Tauri star, we find that the central star's magnetic field typically produces a central hole in the disc and spreads out the surface density distribution. We argue that this result suggests a promising mechanism for explaining the unusual flatness (IR excess) of T Tauri accretion disc spectra.

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