The variable mass loss of the AGB star <ASTROBJ>WX Piscium</ASTROBJ> as traced by the CO J = 1-0 through 7-6 lines and the dust emission

Context: Low and intermediate mass stars lose a significant fraction of their mass through a dust-driven wind during the Asymptotic Giant Branch (AGB) phase. Recent studies show that winds from late-type stars are far from being smooth. Mass-loss variations occur on different time scales, from years to tens of thousands of years. The variations appear to be particularly prominent towards the end of the AGB evolution. The occurrence, amplitude and time scale of these variations are still not well understood. Aims: The goal of our study is to gain insight into the structure of the circumstellar envelope (CSE) of <ASTROBJ>WX Psc</ASTROBJ> and map the possible variability of the late-AGB mass-loss phenomenon. Methods: We have performed an in-depth analysis of the extreme infrared AGB star <ASTROBJ>WX Psc</ASTROBJ> by modeling (1) the