  We investigate the Cauchy problem for the thermoelastic plate system
associated with Newton's law of cooling, where optimal growth ($n\leqslant 4$)
or decay ($n\geqslant 5$) estimates and asymptotic profiles of solutions for
large-time are studied. Especially, the additional lower-order term in the
temperature equation weakens decay rates of the vertical displacement, and
leads to a new leading term comparing with the classical thermoelastic plates.
