Poster abstract details

The sub-mm range ---most of which is only accessible from space--- allows us to probe warm molecular gas ($\sim$50--1000~K), opening a new window from which to study the physics and chemistry of astrophysical objects, particularly of planetary nebulae. NGC 7027 is a young PN essentially constituted by molecular gas (85\% of the total measured mass of the nebula), despite the T$_{eff}$ of its central star being $\sim 1.9 \times 10^5$~K. We present Herschel/HIFI observations of several high-$J$ lines of CO and H$_2$O in this object probing the different components of its warm molecular gas. We have developed a code which, used along the existing SHAPE software, implements spatiokinematical modeling with accurate non-LTE calculations of line excitation and radiative transfer in molecular species. The high quality of the data, together with this code, have allowed us to study, for the first time, the kinematics and excitation conditions of the warm gas of such a high-excitation PN.