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Table 5

Model parameters.

Source rina p a τ100a dbb X(C18O)plateauc X(N2H+)peak X(CH3OH)plateau rsnow(CO)d Tsnow(CO)d rsnow(N2)e
(au) (km s-1) (au) (K)
IRAS4A 33.47 1.8 7.7 0.50 2 × 10-8 1 × 10-10 4 × 10-8 770 24 1200
L1448C 20.66 1.5 3.2 0.35 2 × 10-8 2 × 10-10 8 × 10-8 730 23 1180
L1157 14.38 1.6 2.5 0.80 6 × 10-8 6 × 10-10 <2 × 10-8 540 24 950
IRAS4B 15.00 1.4 4.3 0.40 3 × 10-8 2 × 10-10 3 × 10-7 460 24 760

Notes.

(a)

The envelope’s inner radius rin, the power-law index p, and the optical depth at 100 μm τ100 are taken from Kristensen et al. (2012).

(b)

The Doppler parameter db is obtained by matching the modeled and the observed line widths.

(c)

All fractional abundances in this table are given relative to H2.

(d)

Radius and temperature of the CO snow line as determined from chemical modeling.

(2)

Radius of the N2 snow line as determined from chemical modeling. The temperature at these radii is ~19 K for all sources.

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