  The high-energy environment of the host stars could be deleterious for their
planets. It is crucial to ascertain this contextual information to fully
characterize the atmospheres of terrestrial exoplanets. We aim to fully
characterize a unique triple system, LTT1445, with three known rocky exoplanets
around LTT 1445A. The X-ray irradiation and flaring of this system are studied
through a new 50 ks Chandra observation, which is divided into 10 ks, 10 ks,
and 30 ks segments conducted two days apart, and two months apart,
respectively. This is complemented by an archival Chandra observation
approximately one year earlier and repeated observations with eROSITA (extended
ROentgen Survey with an Imaging Telescope Array), the soft X-ray instrument on
the Spectrum-Roentgen-Gamma (SRG) mission, enabling the investigation of X-ray
flux behavior across multiple time scales. With the observed X-ray flux from
the exoplanet host star A, we estimate the photo-evaporation mass loss of each
exoplanet. With the planet modeling package, VPLanet, we predict the evolution
and anticipated current atmospheric conditions. Our Chandra observations
indicate LTT 1445C as the dominant X-ray source, with additional contribution
from LTT 1445B. LTT 1445A, a slowly-rotating star, exhibits no significant
flare activity in the new Chandra dataset. Comparing the flux incident on the
exoplanets, LTT 1445BC components do not pose a greater threat to the planets
orbiting LTT 1445A than the emission from A itself. According to the results
from the simulation, LTT 1445Ad might have the capacity to retain its water
surface.
