  We present Spitzer Space Telescope and Herschel Space Observatory infrared
observations of the recurrent nova T Pyx during its 2011 eruption, complemented
by ground-base optical-infrared photometry. We find that the eruption has
heated dust in the pre-existing nebulosity associated with T Pyx. This is most
likely interstellar dust swept up by T Pyx - either during previous eruptions
or by a wind - rather than the accumulation of dust produced during eruptions.
