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Fig. 2

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Physical parameters (i.e, number density, infall velocity, dust temperature, and visual extinction) varying with time and radius in the fiducial model. Temporal variation of these physical parameters in specific gas parcels which initially locate at r = 16.9 AU, 5.1×102 AU, 3.0×103 AU, 5.6×103 AU, 7.6×103 AU, and 1.3×104 AU (a–d). The three vertical lines (i.e., green, blue, and red line) indicate the initial moment of infall motion (i.e., t = 0), the beginning moment of warm-up (i.e., the birth of the protostar, t = 2×104 yr), and the end of warm-up phase (i.e., t = 2.2×105 yr), respectively. Radial distributions of these physical parameters at some specific times (e–h). The times shown are relative to the initial moment of infall motion.

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