Arcsecond resolution images of the chemical structure of the low-mass protostar IRAS 16293-2422

摘要: It remains a key challenge to establish the molecular content of different components low-mass protostars, like their envelopes and disks, how this depends on evolutionary stage and/or environment young stars. Observations at submillimeter wavelengths provide direct possibility study chemical composition protostars through transitions probing temperatures up few hundred K in gas surrounding these sources. This paper presents large line survey deeply embedded protostellar binary IRAS 16293-2422 from Submillimeter Array (SMA) - including images individual lines down approximately 1.5-3" (190-380 AU) resolution. More than 500 are identified related 54 species (including isotopologues) about 550 K. Strong differences found between two system with separation between, particular, sulfur- nitrogen-bearing oxygen-bearing complex organics. The action outflow ambient envelope material is seen CO SiO appear influence number other species, (deuterated) water, HDO. effects cold gas-phase chemistry directly imaged maps CO, N2D+ DCO+, showing enhancements first DCO+ subsequently outer where freezes-out dust grains.