Protostars and Planets VI, Heidelberg, July 15-20, 2013
Poster 2S015
Possible Observable Signatures of Classical T Tauri Stars Accreting in an Unstable Regime
Kurosawa, Ryuichi (Max-Planck-Institute for Radio Astronomy)
Romanova, Marina (Cornell University)
Abstract:
Although Classical T Tauri stars are variable in various time-scales,
one type of variability may be associated with the accretion
of gas via the Rayleigh-Taylor instability that occurs at the
interface between an accretion disc and a stellar magnetosphere. In
this regime, gas can accrete in a several, temporarily formed,
accretion streams which appear in random locations, and
produce stochastic photometric and line variability. Here, we present
the results of (1). global three-dimensional magnetohydrodynamic
simulations of matter flows in both stable and unstable accretion
regimes; (2). the corresponding time-dependent hydrogen line profile
calculations and their analysis of the variability behaviors.
We discuss a few key observable signatures which are associated with
the unstable accretion flows caused by the Rayleigh-Taylor
instability.
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