A Detailed Temperature Map of the Archetypal Protostellar Shocks in L1157

We present sensitive $\rm NH_3$ (1,1)--(7,7) line images from the Karl G. Jansky Very Large Array toward successive shocks, which are associated with blueshifted outflow lobe driven by compact protobinary system L1157. Within a projection distance of 0.1 pc, our observations not only trace quiescent and cold gas in flattened envelope but also illustrate complex physical chemical processes that take place where high-velocity jet impinges on its surrounding medium. Specifically, ortho-to-para ratio is enhanced factor 2--2.5 along path, velocity offset between peak wing reaches values as high 10\,km\,s^{-1}$; it shows strong spatial correlation column density, to >10^{16}\,cm^{-2}$ shock cavities. At linear resolution 1500 au, refined temperature map seven lines gradient warm B0 eastern cavity wall ($\rm >120\,K$) cool B1 earlier B2 <80\,K$), indicating heating.