Observational Evidence for Rotational Desorption of Complex Molecules by Radiative Torques from Orion BN/KL

Abstract Complex organic molecules (COMs) are believed to form in the ice mantle of dust grains and released gas by thermal sublimation when grain mantles heated temperatures T d ≳ 100 mathvariant="normal">K . However, some COMs detected regions with below 100 K. Recently, a new mechanism rotational desorption due centrifugal stress induced radiative torques (RATs) was proposed Hoang & Tram (2020) that can desorb at low temperatures. In this paper, we report observational evidence for toward nearest massive star-forming region, Orion BN/KL. We compare abundance three representative have very high binding energy computed observations ALMA, demonstrate explain existence such COMs. also analyze polarization data from SOFIA/HAWC+ JCMT/SCUBA-2 find degree far-infrared/submillimeter decreases increasing temperature 71\,{\rm{K}}$?> 71 This is consistent theoretical prediction using RAT alignment theory Radiative Torque Disruption mechanism. Such an anticorrelation between supports disruption as well RATs.