Table 1: Parameters of our 2-D radiative transfer model of CRL 2136.
Parameters Adopted values Comments1
Central star (IRS 1)2
$T_\star$ 20 000 K Adopted
$L_\star$ 55 000  $L_{\odot}^{3}$ Adopted
$M_\star$ 20  $M_{\odot}^{4}$ Adopted
d 2 kpc5 Adopted
$R_\star$ $5\times10^{11}$ cm Calculated
Bare grains6
Size $0.005\le a\le0.45~\mu$m, $n(a)\propto a^{-3.5}$  
Region $140\la T_{\rm d}\la1500$ K7  
Warm grains6
Size $0.005\le a\le0.45~\mu$m, $n(a)\propto a^{-3.5}$  
Ice mantle crystalline H2O, $f_{\rm w}=300$%  
Region $80\la T_{\rm d}\la140$ K8  
Cold grains6
Size $0.005\le a\le0.45~\mu$m, $n(a)\propto a^{-3.5}$  
Ice mantle amorphous H2O, $f_{\rm c}=5$%  
Region $T_{\rm d}\la80$ K9  
Disk10
$R_{\rm in}$ 30 AU Adopted11
$R_{\rm disk}$ 2000 AU 2000-3000
$M_{\rm disk}$ 0.007 $M_{\odot}$ (SH12, TO13) 0.007-0.01
  0.05 $M_{\odot}$ (LA14) 0.03-0.07
H 2.0 (SH), 1.0 (TO, LA) 1.0-2.0
$\dot{M}_{\rm acc}$ $2.1\times 10^{-7}~M_{\odot}$ yr-1 15
$\alpha,\beta$ 15/8, 9/8 (SH), 2, 1 (TO), 1, 1 (LA) Adopted
Infalling envelope16
$R_{\rm out}$ 0.5 pc 0.3-0.5
$\dot{M}_{\rm env}$ 1.0 $\times$  $10^{-4}~M_{\odot}$yr-1 1.0-1.5 $\times$ 10-4
$\mu_0$ $\cos\left(65\hbox{$^\circ$ }/2\right)$ Estimated
$M_{\rm env}$ 177 $M_{\odot}$ 68.6-17717
Optical depth18
$\tau_{V,{\rm eq}}$ 190 (SH), 210 (TO), 210 (LA) 19
$\tau_{V}$ 66 (SH), 77 (TO), 78 (LA) 20
$\tau_{H}$ 17 (SH), 20 (TO), 21 (LA) 20
$\tau_{K}$ 10 (SH), 12 (TO), 12 (LA) 20
1 Ranges give the uncertainty of the corresponding model parameters; 2 see Sect. 4.1.1; 3 Kastner et al. (1992); 4 Yorke & Sonnhalter (2002); Bernasconi & Maeder (1996); 5 Kastner et al. (1992); 6 see Sect. 4.2.1, the upper limit of the grain size of 0.45 $\mu $m, $f_{\rm w}$, and $f_{\rm c}$ are estimated; 7 $30\la R\la1500$ AU (SH, TO), or 1800 AU (LA); 8 $1500\la R\la5000$ AU (SH, TO), $1800\la R\la5000$ AU (LA); 9 $R\ga5000$ AU, 10: see Sect. 4.2.2; 11 Monnier & Millan-Gabet (2002); 12 Pringle (1981); Shakura & Sunyaev (1973); 13 Lazareff et al. (1990); Toomre (1982); Fischer et al. (1996); 14 Larson et al. (1984); 15 derived from Eq. (5) in Whitney et al. (2003) with a disk viscosity of 0.01; 16 Terebey et al. (1984); Ulrich (1976); Cassen & Moosman (1981); 17 values correspond to $R_{\rm out}$ of 0.3 and 0.5 pc, respectively, and $\dot{M}_{\rm env}$ of $1.0\times 10^{-4}~M_{\odot}$ yr-1; 18 calculated values obtained from our Monte Carlo code; 19 the optical depths at V band towards the equatorial plane; 20 the optical depths at V, H, and K bands towards the observer at a viewing angle of $\theta_{\rm v}=70\hbox{$^\circ$ }$.


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