Impacts of Energetic Particles from T Tauri Flares on Inner Protoplanetary Discs
arxiv(2024)
摘要
T Tauri stars are known to be magnetically active stars subject to strong
flares observed in X-rays. These flares are likely due to intense magnetic
reconnection events during which a part of the stored magnetic energy is
converted into kinetic energy of supra-thermal particles. Since T Tauri stars
are surrounded by an accretion disc, these particles may influence the disc
dynamics and chemistry. This work continues on a previous stationary model,
which showed that energetic particles accelerated during flares can produce a
strong ionisation rate at high column densities in the inner accretion disc.
The present model includes non-stationary sequences of flaring events sampled
by a Chandra X-ray survey of nearby young stellar objects. We calculate the
averaged ionisation rate expected in a radius range from 0.08 to 0.6 au from
the central star. We confirm that energetic particles produced by the flares
dominate the ionisation of the disc up to column densities of
10^25 cm^-2. We further study the main consequences of this
additional source of ionisation on the viscosity, the accretion rate, the
volumetric heating rate and the chemical complexity of inner protoplanetary
discs.
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