  Recent detection of superflares on solar-type stars by Kepler mission raised
a possibility that they can be associated with energetic coronal mass ejections
(CMEs) and energetic particle events (SEPs). These space weather events can
impact habitability of exoplanets around these stars. Here we use the improved
Particle Acceleration and Transport in the Heliosphere (iPATH) model, to model
the time intensity profile and spectrum of SEPs accelerated at CME-driven
shocks from stars of different ages traced by their rotation rates. We consider
a solar-like (G-type) star with 6 different rotation rates varying from 0.5 to
3.0 times rotation speed of the sun. In all 6 cases, a fast CME is launched
with the same speed of 1500 km/sec and the resulting time intensity profiles at
3 locations and and energy spectra at 5 locations at 1 AU are obtained. The
maximum particle energy at the shock front as a function of r is also shown.
Our results suggest that within 0.8 AU the maximum particle energy at the shock
front increases with the rotation rate of the star. However, event integrated
spectra for the five selected locations along the CME path show complicated
patterns. This is because the Parker magnetic field for rapidly rotating stars
is more tightly winded. Our results can be used in estimating the radiation
environments of terrestrial-type exoplanets around solar-type stars.
